CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 1 of 42
`
`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 1 of 42
`
`
`Exhibit 21
`Exhibit 21
`
`Page 1
`
`OWTEx. 2148
`Tennant Company v. OWT
`IPR2021-00625
`
`

`

`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 2 of 42
`
`CASE 0:20-cv-00358-ECT-HB
`
`eee
`
`US008025787B2
`
`a2) United States Patent
`US 8,025,787 B2
`(0) Patent No.:
`Field et al.
`Sep. 27, 2011
`(45) Date of Patent:
`
`(54) METHOD AND APPARATUS FOR
`GENERATING, APPLYING AND
`NEUTRALIZING AN
`ELECTROCHEMICALLYACTIVATED
`LIQUID
`
`(56)
`
`(75)
`
`Inventors: Bruce F. Field, Golden Valley, MN
`(US); Patrick I. Grenhund, Somerset,
`WI(US)
`
`(73) Assignee: Tennant Company. Minncapolis, MN
`(US)
`
`(*) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 1167 days.
`
`AU
`
`References Cited
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`(21) Appl. No.: 11/685,415
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`(22)
`
`Filed:
`
`Jan. 19, 2007
`
`(65)
`
`Prior Publication Data
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`Aug. 16, 2007
`
`Related U.S. Application Data
`
`(60) Provisional application No. 60/864,724,filed on Nov.
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`(2006.01)
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`
`(Continued)
`OTHER PUBLICATIONS
`
`Aoki et al., Water lreatment Using Llectrolysis-lonized Water, 1994,
`Jpn. J. Appl. Phys. vol. 33, pp. $686-5689,*
`
`(Contimed)
`
`Primary Examiner — Arun S Phasge
`(74) Attorney, Agent, or Firm — David D. Brush; Westman,
`Champlin & Kelly, PA.
`
`ABSTRACT
`(37)
`A method and apparatus are providedfor recciving a cleaning
`liquid having a pH in a range between pH6-pH8 and an
`oxidation reduction potential (ORP) between +50 mV. The
`liquid is converted into an anolyte liquid and a catholyte
`liquid having respective pHs outside of the range between
`pH6-pH8 and having respective ORPs outside the range
`between +50 mV. Lhe anolyte and catholyte liquids are
`applied to a surface, wherein the anolyte and catholyte liquids
`are, for example, in a combined state on the surface and
`substantially neutralize to a pII between pI16-pl]8 and an
`ORP between +50 mVwithin one minute ofthe time at which
`the anolyte and catholyte liquids are converted.
`19 Claims, 17 Drawing Sheets
`
`50
`
` FUNCTIONAL
`
`GENERATOR
`
`16
`
`CELL
`
`oa ELECTROLYSIS
`
`Page 2
`
`TC00016871
`
`OWTEx. 2148
`Tennant Company v. OWT
`IPR2021-00625
`
`

`

`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 3 of 42
`
`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 3 of 42
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`
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`
`
`
`
`.
`
`Page 3
`
`TC00016872
`
`OWTEx. 2148
`Tennant Company v. OWT
`IPR2021-00625
`
`

`

`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 4 of 42
`
`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 4 of 42
`
`US 8,025,787 B2
`
`Page 3
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`.
`Final Ollice Action from the Uniled Slates Palent and ‘lrademark
`Olfice for U.S, Appl. No. 11/655,378. dated Jul. 2, 2010,
`Notice of Allowance from the United States Patent and Trademark
`Office for U.S. Appl. No. 11/655,385, dated Jul. 14, 2010.
`Chinese Office Action with English Translation dated Jun. 9, 2019 for
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`8, 2007.
`JP-HC 15022149.
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`U.S. Appl. No. £1/655,390, dated Jan. 19, 2007
`
`Page 4
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 5 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 5 of 42
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`US 8,025,787 B2
`Page 4
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`
`
`
`
`ffice Action from the United States Patent and Trademark Office for
`S. Appl. No. 1£1/655,365, dated Dec. 3, 2010.
`nal Office Action from the United States Patent and Trademark
`ffice for U.S. Appl. No. 11/655,378, dated Jan. 25, 201 £.
`fice Action from the United States Patent and Trademark Office for
`S. Appl. No. 11/655,359, dated Feb. 3, 2011.
`otice of Allowance from the LInited States Patent and Trademark
`ffice for U.S. Appl. No. 12/122,350, dated Mar. 16, 2011.
`otice of Allowance from the United States Patent and Trademark
`ffice for U.S. Appl. No. 11/655,389, dated Mar. 17, 2011.
`olice of Allowance iromthe United States Patent and Trademark
`fice for U.S. Appl. No. 11/655,360, dated Mar. 18, 2011.
`otice of AHowance from the United States Patent and ‘Trademark
`ffice for U.S. Appl. No. 11/655,310, dated Mar. 23, 2011.
`nglish Translation ofJapanese Office Action dated May 25, 2011 for
`corresponding Japanese Application No. 2008-554350,
`Notice ofAllowability fromthe United States Patent and Trademark
`Office for U.S. Appl. No. 11/655,378,. dated Apr. 28, 2011.
`Notice of Allowance from the United States from the United. States
`Patent and Trademark Office for U.S. Appl. No. 11/655,378, dated
`May 10, 2011.
`English Translation ofJapanese Office Action dated Jun. 17, 2011 for
`Japanese Patent Application No. 2008-554363.
`English Translation ofJapanese Office Action dated May 31, 2011 for
`Japanese Patent Application No. 2008/554377.
`
`
`oomcdo-Hozezozoz:
`
`* cited by examiner
`
`Office Action from the United States Patent and Trademark Office for
`U.S. Appl. No. 11/655.359, dated Mar. 19, 2009.
`Restriction Requirement from the United States Patent and Trade-
`mark Office for Appl. No. 11/655,390, dated Apr. 10, 2009.
`Office Action from the UnitedStates Patent and Trademark Office for
`U.S. Appl. No. 11/655,390, dated Jul. 16, 2009
`Office Action from the United States Patent and Trademark Office for
`U.S. Appl. No. 11/655,359, dated Nov. 13, 2009.
`Notice of Allowance from the Uniled States Patent and Trademark
`Office for U.S. Appl. No. 11/655,390, dated Jan. 6, 2011.
`Olfice Action from the United States Patent and 'lrademark Office for
`ULS, Appl. 11/655,390, dated Jul. 19, 2019.
`Restriction/Election Requirement from the United States Patent and
`Trademark Office for U.S. Appl. No. 11/655,365, dated Aug. 17,
`2010.
`Office Action from the United States Patent and Trademark Office for
`U.S. Appl. No. 11/655,359, dated Aug. 18, 2010.
`Office Action from the United States Patent and Trademark Office for
`U.S. Appl. No. 11/655,378, dated Sop. 9, 2010.
`Office Action from the United States Patent and Trademark Office for
`U.S. Appl. No. 11/655,360, dated Sep. 30, 2010.
`Office Action from the UnitedStates Patent and Trademark Office for
`
`U.S. Appt. No. 12/122,350,dated. Sep. 30, 2010.
`Ollice Action fromthe Uniled States Patent and Trademark Office Lor
`U.S, Appl. No. 11/655,310, dated Oct. 1, 2010.
`Office Action fromthe United States Patent and'lrademark Office for
`USS, Appl. No. 11/655,389,dated Oct. 1, 2010.
`
`
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 6 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 6 of 42
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`U.S. Patent
`
`Sep. 27, 2011
`
`Sheet 1 of 17
`
`US 8,025,787 B2
`
`L4
`
`LIQUID
`
`10
`
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`
`FIG, 1
`
`14
`
`LIQUID
`
`
`
`FIG. 2
`
`Page 6
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 7 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 7 of 42
`
`U.S. Patent
`
`Sep. 27, 2011
`
`Sheet 2 of 17
`
`US 8,025,787 B2
`
`
` 16
`
`SPARGING
`FUNCTIONAL
`
`
`DEVICE
`GENERATOR
`
`
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`
` L6
`FUNCTIONAL
`
`GENERATOR
`
`DEVICE
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` 16
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`FUNCTIONAL
`ELECTROLYSIS
`GENERATOR
`
`CELL
`
`
`46
`
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`
` ELECTROLYSIS
`
`FIG. 6
`
`Page 7
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 8 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 8 of 42
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`U.S. Patent
`
`Sep. 27, 2011
`
`Sheet 3 of 17
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`US 8,025,787 B2
`
` 60
`
`FIG. 7
`
`Page 8
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 9 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 9 of 42
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`Sep. 27, 2011
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`Sheet 4 of 17
`
`U.S. Patent
`
`US 8,025,787 B2
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`Page 9
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`Sep. 27, 2011
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`Sheet 5 of 17
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`US 8,025,787 B2
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 10 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 10 of 42
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`U.S. Patent
`
`Page 10
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`TC00016879
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`

`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 11 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 11 of 42
`
`U.S. Patent
`
`Sep. 27, 2011
`
`Sheet 6 of 17
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`US 8,025,787 B2
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`Page 11
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 12 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 12 of 42
`
`U.S. Patent
`
`Sep. 27, 2011
`
`Sheet 7 of 17
`
`US 8,025,787 B2
`
`£00 FIG. 10B
`
`fl2
`
`Page 12
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 13 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 13 of 42
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`U.S. Patent
`
`Sep. 27, 2011
`
`Sheet 8 of 17
`
`US 8,025,787 B2
`
`FIG. 10€
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`Page 13
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 14 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 14 of 42
`
`U.S. Patent
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`Sep. 27, 2011
`
`Sheet 9 of 17
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`US 8,025,787 B2
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`TC00016883
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 15 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 15 of 42
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`U.S. Patent
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`Sep. 27, 2011
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 16 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 16 of 42
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`U.S. Patent
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`Sep. 27, 2011
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 17 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 17 of 42
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`U.S. Patent
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`Sep. 27, 2011
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 18 of 42
`
`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 18 of 42
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`U.S. Patent
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`Sep. 27, 2011
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 19 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 19 of 42
`
`U.S. Patent
`
`Sep. 27, 2011
`
`Sheet 14 of 17
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`US 8,025,787 B2
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`
`
`Page 19
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 20 of 42
`
`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 20 of 42
`
`U.S. Patent
`
`US 8,025,787 B2
`
`Sep. 27, 2011
`
`Sheet 15 of 17
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`384
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`Page 20
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 21 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 21 of 42
`
`U.S. Patent
`
`Sep. 27, 2011
`
`Sheet 16 of 17
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`US 8,025,787 B2
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`400
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`Page 21
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 22 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 22 of 42
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`U.S. Patent
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`Sep. 27, 2011
`
`Sheet 17 of 17
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`US 8,025,787 B2
`
`
`
`FIG. 21
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`Page 22
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 23 of 42
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`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 23 of 42
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`US 8,025,787 B2
`
`1
`METHOD AND APPARATUS FOR
`GENERATING, APPLYING AND
`NEUTRALIZING AN
`ELECTROCHOEMICALLY ACTIVATED
`LIQUID
`
`
`
`CROSS-REFERENCE TO RELATED
`
`APPLICATIONS
`
`
`
`
`
`This application claimspriority from and the benefit ofthe
`following U.S. Provisional Applications: 60/772,104, filed
`
`Feb. 10, 2006 and entitled “ELECTROCIEMICALLY
`ACTIVATED WATER FOR HARD AND SOPT FLOOR
`CLEANING SYSTEMS,”60/815,804, filed Jun. 22, 2006
`
`and
`entitled
`“ELECTROCHEMICALLY
`ACTIVATED
`WATER FOR HARD AND SOFT FLOOR CLEANING
`SYSTEMS;” 60/815,721, filed Tun. 22, 2006 and entitled
`
`“METHOD AND APPARATUS FOR THE GENERATION
`AND USE OF SPARGED BLECTROCHEMICALLY
`ACTIVATED LIQUID;”and 60/864,724, filed Nov. 7, 2006
`and entitled “METHOD ANID APPRATAUS FOR THE
`
`GENERATION AND USE OF ELECTROCHEMICALLY
`ACTIVATED TTIQUID WITH VISUAD,
`INDICATOR,”
`which are incorporated herein byreferencein their entireties.
`Cross-reference is also made to the following U.S. patent
`applications, which were filed on even date herewith and are
`hereby incorporated by reference in their entireties: U.S.
`application Ser. No. 11/655,365, entitled “CLEANING
`APPARATUS HAVING A FUNCTIONAL GENERATOR
`FOR PRODUCING ELECTROCHEMICALLY ACTI-
`VATED CLEANING LIQUID,”USS. application Ser. No.
`
`11/655,389,
`entitled “METHOD FOR GENERATING
`ELECTROCHEMICALLYACTIVATED CLEANINGLIQ-
`UID;” U.S. application Ser. No. 11/655,359, entitled
`“MOBILE SURFACE CLEANER HAVING A SPARGING
`DEVICE;” U.S. application Ser. No. 11/655,360, entitled
`“METHOD OF PRODUCING A SPARGED CLEANING
`LIQUID ONBOARD A MOBILE SURFACE CLEANER;”
`U.S. application Ser. No. 11/655,390,entitled “APPARATUS
`FOR GENERATING SPARGED, ELECTROCHEMI-
`CALLY ACTIVATED LIQUID;” U:S. application Ser. No.
`11/655,310,
`entitled
`“METHOD OF GENERATING
`SPARGID, ELECTROCHEMICALLY ACTIVATID LIQ-
`UID,” U.S. application Ser. No. 11/655,385, entitled
`“METHOD AND APPARATUS FOR PRODUCING
`HUMANTY-PERCEPTABLE INDICATOR OF ELECTRO-
`CHEMICAL PROPERTIES OF AN OUTPUT CLEANING
`LIQUID,” and U.S. application Ser. No. 11/655,378, entitled
`
`“GLECTROCHEMICALLY ACTIVATED ANOLYTE AND
`CATHOLYTE LIQUID.”
`
`FIELD OF THE DISCLOSURE
`
`The present disclosurerelates to cleaning and/or sanitizing
`systems, and more particularly but notlimited to systemsthat
`generate a working liquid having cleaning and/or sanitizing
`properties.
`BACKGROUND OFTHE DISCLOSURE
`
`A wide variety of systems are in use today for cleaning or
`disinfecting residential,
`industrial, commercial, hospital,
`food processing, andrestaurant facilities, such as surfaces and
`other substrates, and for cleaning or disinfecting various
`items, such as food products or other articles.
`Tor example, hard floor surface scrubbing machines are
`widely used to clean the Moors of indusirial and commercial
`
`2
`buildings. They range in size from a smali model, which is
`controlled by an operator walking, behindit, to a large model,
`which is controlled by an operator riding on the machine.
`Such machines in gencral are wheeled vehicles with suitable
`operator controls. Their bodies contain power and drive ele-
`ments, a solution tankto hold acleaning liquid, anda recovery
`tank to hold soiled solution recovered from the floor being
`scrubbed. A scrub head, which centains one or more scrub-
`bing brushes andassociated drive elementsare attached to the
`vehicle and may be locatedin front of, under or behindil. A
`solution distribution system dispenses cleaning liquid from
`the solution tank to the Moor im the vicinity of the scrubbing
`brushor brushes.
`Soft floor cleaning, machines can be implemented as small
`mobile machines that are handled by an operator or can be
`implemented in a truck-mounted system having a cleaning
`wand connected to the truck. The truck carries a cleaning
`liquid solution tank, a wastewater recovery tank and a pow-
`erful vacuum extractor.
`Typical cleaning liquids used in hard and soft floor clean-
`ing systems include water and a chemically based detergent.
`The detergent typically includes a solvent, a builder, and a
`surfactant. While these detergents increase cleaning effec-
`tiveness for a variety of different soil types, such as dirt and
`oils, these detergents also have a tendency to leave unwanted
`residue on the cleaned surface. Such residue can adversely
`affect the appearance ofthe surface and the tendencyofthe
`surface to re-soil and, depending on the detergent, can poten-
`tially cause adverse health or environment effects. Similar
`disadvantages apply to cleaning systems for other types of
`surfaces and items.
`Improved cleaning systemsare desiredfor reducing the use
`oftypical detergents and/or reducing the residue left on the
`surface after cleaning while maintaining desired cleaning
`and/or disinfecting propertics.
`SUMMARY
`
`An embodimentof the disclosure is directed to a method,
`whichincludes: a) receiving a liquid having a pH in a range
`between pll6-pl18 and an oxidation reduction potential
`(ORP) between +50 mV; b) converting the liquid into an
`anolyte liquid and a catholyte liquid, which have respective
`pHsoutside of the range between pH6-pH8 andhave respec-
`tive ORPs outside the range between +50 mV;c) applying the
`anolyte and catholyte liquids to a surface for a residence time;
`and d) recovering at
`least a portion of the anolyte and
`catholyte liquids fromthe surface after the residence time and
`placing the anolyte and catholyte liquids in a common recov-
`ery tank, wherein the anolyte and catholyte liquids substan-
`tially neutralize to a pH between pH6-pH8 and an ORP
`between +50 mVwithin one minute of the time at which the
`anolyte and catholyte liquids are convertedin step b).
`Another embodiment
`is directed to a method, which
`includes: a) reeciving a liquid having a pH ina range between
`pH6-pH8 and an oxidation reduction potential
`(ORP)
`between +50 mV: b) converting the liquid into an anolyte
`liquid and a catholyte liquid having respective pHs outside of
`the range between pH6-pH8 and having respective ORPs
`outside the range between +50 mV; and ¢) applying the
`anolyte andcatholyte liquids to a surlace, wherein the anolyte
`and catholyte liquids are in a blended state on the surface and
`substantially neutralize to a pH between pH6-pH& and an
`ORP between 250 mVwithin one minuteofthe time at which
`the anolyte and catholyte liquids are convertedin step b).
`Another embodimentis directed to an apparatus. The appa-
`ratus includes: a source [or receiving a liquid having a pH in
`
`a
`
`fs2
`
`50
`
`wnon
`
`6c
`
`Page 23
`
`TC00016892
`
`OWTEx. 2148
`Tennant Company v. OWT
`IPR2021-00625
`
`

`

`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 24 of 42
`
`CASE 0:20-cv-00358-ECT-HB Doc. 80-17 Filed 06/10/21 Page 24 of 42
`
`US 8,025,787 B2
`
`3
`arange between pH6-pH8 and an oxidation reduction poten-
`tial (ORP) between +50 mV. Anelectrolyzer, which converts
`the received liquid to an anolyte liquid and a catholyte liquid,
`which have respective plIIs outside of the range between
`pH6-pH8 and have respective ORPs outside the range
`between +50 mV. A flowpath fromthe electrolyzer is con-
`figured to dispense the anolyte and catholyte liquids from the
`apparatus. A recovery device recoversat least a portion ofthe
`anolyte and catholyte liquids from a surface after a residence
`time onthe surlace andplacesthe liquids in a common recov-
`ery tank, wherein the anolyte and catholyte liquids substan-
`tially neutralize to a pI] between pl16-pl18 and an ORP
`between £50 mVwithin one minute ofthat time at which the
`anolyte and catholyte liquids are converted by the electro-
`lyzer.
`
`BRILT DESCRIPTION OF THE DRAWINGS
`
`FIG. 1 illustrates an example of a functional generator,
`which can be used to electrochemically activate a liquid to be
`treated for use in cleaning, such as water, onboard or off-
`board a hard and/or soft floor cleaner according to an embodi-
`ment of the disclosure.
`FIG. 2 illustrates a functional generator according to
`another embodiment ofthe disclosure.
`FIG, 3 illustrates an apparatus having a sparging device
`located downstream ofa functional generator, according to an
`embodimentof the disclosure.
`FIG. 4 illustrates an apparatus having a sparging device
`located upstream of a functional generator, according to an
`embodiment ofthe disclosure.
`FIG. 5 illustrates an apparatus having an electrolysis cell
`type sparging device located upstream ofa functional gen-
`erator, according to an embodimentofthe disclosure.
`FIG. 6 illusirates an apparatus having sparging devices
`located upstream and downstream ofa functional generator,
`according to an embodiment of the disclosure.
`l'IG. 7 iustrates an electrolysis cell type sparging device,
`according to an embodimentofthe disclosure.
`TIGS, 84 and 8B togetherillustrate a housing containing a
`sparging device and a functional generator according to an
`embodimentof the disclosure.
`FIG. 9 is a perspective view of the sparging device shown
`in FIG. 8B.
`FIG. 10A is a side elevation view of a mobile hard floor
`surface cleaner in accordance with one or more exemplary
`embodiments of the disclosure.
`