I IIIII IIIIIIII Ill lllll lllll lllll lllll lllll lllll lllll lllll 111111111111111111
`US009054421B2
`
`c12) United States Patent
`Puente Baliarda et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 9,054,421 B2
`*Jun. 9, 2015
`
`( 54) MULTILEVEL ANTENNAE
`(71) Applicant: Fractus, S.A., Barcelona (ES)
`Inventors: Carles Puente Baliarda, Sant Cugat de!
`(72)
`Valles (ES); Carmen Borja Borau,
`Barcelona (ES); Jaume Anguera Pros,
`Vinaros (ES); Jordi Soler Castany,
`Mataro (ES)
`(73) Assignee: Fractus, S.A., Barcelona (ES)
`( *) Notice:
`Subject to any disclaimer, the term ofthis
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 131 days.
`
`This patent is subject to a terminal dis(cid:173)
`claimer.
`(21) Appl. No.: 13/732,761
`Jan.2,2013
`(22) Filed:
`Prior Publication Data
`
`(65)
`
`US 2013/0194154Al
`
`Aug. 1, 2013
`
`Related U.S. Application Data
`
`(63) Continuation of application No. 13/669,916, filed on
`Nov. 6, 2012, now abandoned, which is a continuation
`of application No. 13/411,212, filed on Mar. 2, 2012,
`now Pat. No. 8,330,659, which is a continuation of
`
`(51)
`
`Int. Cl.
`HOlQ 1/38
`HOlQ 1/50
`
`(Continued)
`
`(2006.01)
`(2006.01)
`(Continued)
`
`(52) U.S. Cl.
`CPC . HOlQ 1/50 (2013.01); HOlQ 1/36 (2013.01);
`HOlQ 1/38 (2013.01); HOlQ 5/0051 (2013.01);
`(Continued)
`
`( 58) Field of Classification Search
`USPC ........................... 343/700 MS, 702, 829, 846
`See application file for complete search history.
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`621,455 A
`646,850 A
`
`3/1899 Hess
`4/1900 Lindemyer
`(Continued)
`
`FOREIGN PATENT DOCUMENTS
`
`AU
`CA
`
`9/1999
`2438199
`1/2002
`2416437
`(Continued)
`
`OTHER PUBLICATIONS
`Document 0256-Plaintiff Fractus, S. A.'s answer to the counter(cid:173)
`claims of defendants Research in Motion Ltd. and Research in
`Motion Corporation to the Second Amended Complaint. Susman
`Godfrey. Jan. 4, 2010.
`
`(Continued)
`
`Primary Examiner - Tho G Phan
`(74) Attorney, Agent, or Firm -Edell, Shapiro & Firman
`LLC
`
`(57)
`
`ABSTRACT
`An apparatus includes an antenna element that operates in at
`least first and second non-overlapping frequency bands and
`has geometric elements arranged to define empty spaces in
`the antenna element to provide first and second winding cur(cid:173)
`rent paths through the antenna element, the first and second
`winding current paths circumventing the empty spaces and
`respectively corresponding to the first and second frequency
`bands to provide the antenna element with multi-band behav(cid:173)
`ior. The apparatus further includes a ground plane, with the
`antenna element being electrically coupled to the ground
`plane. The antenna element provides a substantially similar
`impedance level and radiation pattern in the first and second
`frequency bands. The geometric elements are arranged such
`that the antenna element does not comprise a group of single
`band antennas that respectively operate in the first and second
`frequency bands, and the antenna element is not a fractal type
`antenna element.
`
`23 Claims, 14 Drawing Sheets
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1001.0001
`
`

`

`US 9,054,421 B2
`Page 2
`
`Related U.S. Application Data
`
`applicationNo.13/044,189, filed on Mar. 9, 2011, now
`Pat. No. 8,154,463, which is a continuation of appli-
`cation No. 12/400,888, filed on Mar. 10, 2009, now
`Pat. No. 8,009,111, which is a continuation of appli-
`cation No. 11/780,932, filed on Jul. 20, 2007, now Pat.
`No. 7,528,782, which is a continuation of application
`No. 11/179,257, filed on Jul. 12, 2005, now Pat. No.
`7,397,431, which is a continuation of application No.
`11/102,390, filed onApr. 8, 2005, now Pat. No. 7,123,
`208, which is a continuation of application No. 10/963,
`080, filed on Oct. 12, 2004, now Pat. No. 7,015,868,
`which is a continuation of application No. 10/102,568,
`filed on Mar. 18, 2002, now abandoned, which is a
`continuation of application No. PCT/ES99/00296,
`filed on Sep. 20, 1999.
`
`(51)
`
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`
`Int. Cl.
`HOlQ 1/36
`H01Q5/00
`HOlQ 9/04
`HOlQ 9/06
`HOlQ 9/28
`HOlQ 9/40
`H01Q5/0l
`(52) U.S. Cl.
`CPC ............... HOlQ 9/04 (2013.01); HOlQ 9/0407
`(2013.01); HOlQ 9/065 (2013.01); HOlQ 9/28
`(2013.01); HOlQ 9/40 (2013.01); HOlQ 5/001
`(2013.01); HOlQ 5/01 (2013.01)
`
`(56)
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`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1001.0002
`
`

`

`US 9,054,421 B2
`Page 3
`
`(56)
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`343/700 MS
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1001.0003
`
`

`

`US 9,054,421 B2
`Page 4
`
`(56)
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`1/2004 Ghosh
`
`6,693,603 Bl
`6,697,024 B2
`6,707,428 B2
`6,727,855 Bl*
`6,741,210 B2
`6,756,944 B2
`6,812,893 B2
`6,831,606 B2
`6,897,830 B2
`6,937,191 B2
`6,937,196 B2
`6,943,730 B2
`6,977,808 B2
`6,980,158 B2
`6,995,720 B2
`7,015,868 B2
`7,047,040 B2
`7,072,698 B2
`7,075,483 B2
`7,091,911 B2
`7,095,372 B2
`7,102,577 B2
`7,116,273 B2
`7,119,748 B2
`7,123,208 B2
`7,126,537 B2
`7,202,818 B2
`7,209,081 B2
`7,256,743 B2
`7,256,751 B2
`7,265,724 Bl
`7,312,762 B2
`7,342,553 B2
`7,388,549 B2
`7,394,432 B2
`7,397,431 B2
`7,403,159 B2
`7,403,165 B2
`7,528,782 B2
`7,659,864 B2 *
`7,663,556 B2
`7,755,546 B2
`7,903,034 B2
`7,911,014 B2
`8,369,950 B2 *
`8,427,373 B2 *
`2001/0011964 Al
`2001/0018793 Al
`2001/0050635 Al
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`2006/0001576 Al
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`343/700 MS
`
`2/2004 Smith et al.
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`3/2004 Gram
`4/2004 Nalbandian .
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`6/2004 Tessier
`11/2004 Waterman
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`10/2008 Anguera
`8/2013 Puente Baliarda et al. ... 343/860
`
`FOREIGN PATENT DOCUMENTS
`
`CN
`CN
`DE
`DE
`
`2224466
`1559093
`3337941
`4313397
`
`4/1996
`12/2004
`5/1985
`11/1994
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1001.0004
`
`

`

`US 9,054,421 B2
`Page 5
`
`(56)
`
`References Cited
`
`FOREIGN PATENT DOCUMENTS
`
`DE
`DE
`DE
`DE
`DE
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`EP
`ES
`ES
`ES
`FR
`FR
`FR
`GB
`GB
`GB
`GB
`GB
`GB
`GB
`GB
`JP
`JP
`
`19511300
`19929689
`10206426
`10138265
`10204079
`0096847
`0297813
`0358090
`0431764
`0543645
`0590671
`0571124
`0688040
`0765001
`0753897
`0814536
`0856907
`0871238
`0892459
`0902472
`0929121
`0932219
`0938158
`0942488
`0969375
`1024552
`0986130
`0997972
`0993070
`0997974
`1018777
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`1026774
`1063721
`1067627
`1071161
`1077508
`1079462
`1083624
`1094545
`1096602
`1148581
`1198027
`0749176
`1237224
`1258054
`1267438
`1326302
`1378961
`1317018
`1396906
`1401050
`1414106
`1424747
`1443595
`1453140
`1465291
`0843905
`1515392
`2112163
`2142280
`2156832
`2543744
`2704359
`2837339
`2112579
`2161026
`2215136
`2289163
`2317994
`2330951
`2355116
`2361584
`53009451
`55123203
`
`10/1996
`1/2001
`11/2002
`7/2003
`8/2003
`12/1983
`1/1989
`3/1990
`6/1991
`5/1993
`9/1993
`11/1993
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`11/2003
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`4/2004
`6/2004
`8/2004
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`10/2004
`12/2004
`3/2005
`3/1998
`5/2000
`1/2002
`10/1984
`11/1994
`9/2003
`7 /1983
`1/1986
`9/1989
`11/1995
`4/1998
`5/1999
`4/2001
`10/2001
`1/1978
`9/1980
`
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`JP
`NZ
`RU
`SE
`TW
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`
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`5007109
`5147806
`5267916
`5308223
`5347507
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`10-209744
`10-303637
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`11-027042
`11088032
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`11-220319
`11317610
`2002-158529
`3449484
`2003283230
`508835
`2170478
`518988
`554571
`88/09065
`93/12559
`94/24722
`94/24723
`95/05012
`95/11530
`96/03783
`96/04691
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`96/29755
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`
`10/1991
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`10/1994
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`4/1995
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`2/1996
`4/1996
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`7 /1998
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`5/1999
`5/1999
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`6/1999
`6/1999
`7 /1999
`8/1999
`11/1999
`11/1999
`11/1999
`11/1999
`12/1999
`12/1999
`1/2000
`1/2000
`1/2000
`2/2000
`4/2000
`5/2000
`6/2000
`6/2000
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1001.0005
`
`

`

`US 9,054,421 B2
`Page 6
`
`(56)
`
`References Cited
`
`FOREIGN PATENT DOCUMENTS
`
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`WO
`
`00/49680
`00/52784
`00/52787
`00/55939
`00/57511
`00/67342
`00/74172
`00/77884
`01/03238
`01/05048
`01/06594
`01/08255
`01/08257
`01/08260
`01/09976
`01/11721
`01/13464
`01/15270
`01/15271
`01/17061
`01/17063
`01/17064
`01/18904
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`01/20714
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`01/39321
`01/41252
`01/48861
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`01/65636
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`01/78192
`01/82410
`01/86753
`01/89031
`02/01668
`02/35646
`02/35652
`02/054538
`02/065583
`02/071535
`02/078123
`02/078124
`02/080306
`02/087014
`02/089254
`02/091518
`02/096166
`02/103843
`03/003503
`03/017421
`03/023900
`03/026064
`2004/075011
`
`8/2000
`9/2000
`9/2000
`9/2000
`9/2000
`11/2000
`12/2000
`12/2000
`1/2001
`1/2001
`1/2001
`2/2001
`2/2001
`2/2001
`2/2001
`2/2001
`2/2001
`3/2001
`3/2001
`3/2001
`3/2001
`3/2001
`3/2001
`3/2001
`3/2001
`3/2001
`3/2001
`4/2001
`4/2001
`4/2001
`4/2001
`4/2001
`5/2001
`5/2001
`5/2001
`5/2001
`5/2001
`5/2001
`6/2001
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`10/2001
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`11/2001
`11/2001
`11/2001
`1/2002
`5/2002
`5/2002
`7/2002
`8/2002
`9/2002
`10/2002
`10/2002
`10/2002
`10/2002
`11/2002
`11/2002
`11/2002
`12/2002
`1/2003
`2/2003
`3/2003
`3/2003
`9/2004
`
`OTHER PUBLICATIONS
`
`Document 0257-PlaintiffFractus, S. A.'s answer to counterclaims
`of defendant Pantech Wireless, Inc. to the Second Amended Com(cid:173)
`plaint. Susman Godfrey. Jan. 4, 2010.
`Document 0258-Plaintiff Fractus, S. A.'s answer to defendant
`Kyocera Communications, Inc's Counterclaims to the Second
`Amended Complaint. Susman Godfrey. Jan. 4, 2010.
`
`Document 0259-Plaintiff Fractus, S. A.'s answer to defendant
`Kyocera Wireless Corp's Counterclaims to the Second Amended
`Complaint. Susman Godfrey. Jan. 4, 2010.
`Document 0260-Plaintiff Fractus, S. A.'s answer to defendant
`Palm, Inc's Counterclaims to the Second Amended Complaint. Sus(cid:173)
`man Godfrey. Jan. 4, 2010.
`Document 0261-Plaintiff Fractus, S. A.'s answer to defendant
`UTStarcom, Inc's Counterclaims to the Second Amended Com(cid:173)
`plaint. Susman Godfrey. Jan. 4, 2010.
`Document 0262-PlaintiffFractus, S. A.'s answer to counterclaims
`of defendant Samsung Telecommunications America LLC to the
`Second Amended Complaint. Susman Godfrey. Jan. 4, 2010.
`Document 0263-PlaintiffFractus, S. A.'s answer to counterclaims
`of defendants LG Electronics Inc., Electronics USA, Inc., and LG
`Electronics Mobilecomm USA, Inc. To the Second Amended Com(cid:173)
`plaint. Susman Godfrey. Jan. 4, 2010.
`Document 0273-PlaintiffFractus, S. A.'s answer to counterclaims
`of defendants HTC America, Inc to the Second Amended Complaint.
`Susman Godfrey. Jan. 14, 2010.
`Document 0286-Amended answer of the Sharp defendants to plain(cid:173)
`tiffs second amended complaint. Defendants. Feb. 24, 2010.
`Document 0287-Defendants Samsung Electronics Co., Ltd.'s;
`Samsung Electronics Research Institute's and Samsung Semicon(cid:173)
`ductor Europe GMBH' s first amended answer; and Samsung Tele(cid:173)
`communications America LLC' s first amended answer. Defendants.
`Feb. 24, 2010.
`Document 0288-Defendants LG Electronics Inc., LG Electronics
`USA, Inc., and LG Electronics Mobilecomm USA Inc. First
`amended answer and counterclaim to second amended complaint.
`Defendants. Feb. 24, 2010.
`Document 0290-Defendant HTC America, Inc.'s amended answer
`and counterclaim to plaintiffs second amended complaint. Defen(cid:173)
`dants. Feb. 24, 2010.
`Document 0291-Defendant HTC Corporation's amended answer
`and counterclaim to plaintiffs second amended complaint. Defen(cid:173)
`dants. Feb. 24, 2010.
`Document 0297-Defendant HTC Corporation's amended answer
`and counterclaim to plaintiffs second amended complaint. Defen(cid:173)
`dants. Feb. 25, 2010.
`Document 0298-Defendant HTC America, Inc.'s amended answer
`and counterclaim to plaintiffs second amended complaint. Defen(cid:173)
`dants. Feb. 25, 2010.
`Document 03 51-Plaintiff Fractus, S. A.' s answer to amended coun(cid:173)
`terclaims of defendant Samsung Telecommunications America
`LLC's to Fractus's Second Amended Complaint. Susman Godfrey.
`Apr. 1, 2010.
`Document 0352-PlaintiffFractus, S. A.'s answer to amended coun(cid:173)
`terclaims of defendant HTC Corporation to Fractus's Second
`Amended Complaint. Susman Godfrey. Apr. 1, 2010.
`Document 03 53-Plaintiff Fractus, S. A.' s answer to amended coun(cid:173)
`terclaims of defendant HTC America, Inc. To Fractus's Second
`Amended Complaint. Susman Godfrey. Apr. 1, 2010.
`Document 03 54-Plaintiff Fractus, S. A.' s answer to amended coun(cid:173)
`terclaims of defendant LG Electronics Inc., LG Electronics USA,
`Inc., and LG Electronics Mobilecomm USA Inc's to Fractus's Sec(cid:173)
`ond Amended Complaint. Susman Godfrey. Apr. 1, 2010.
`Document 0415-P.R. 4-3 joint claim construction statement. Sus(cid:173)
`man Godfrey. Jun. 14, 2010.
`Document 0423-Fractus SA's Opening Claim Construction Brief
`with Parties' Proposed and Agreed Constructions in the case of
`Fractus SA v. Samsung Electornics Co. Ltd. et al .. Susman Godfrey.
`Jul. 16, 2010.
`Document 0428-Response of defendants Kyocera Communica(cid:173)
`tions, Inc; Palm Inc. and UTStarcom, Inc. To plaintiffFractus SA's
`opening claim construction brief in "Case 6:09-cv-00203-LED(cid:173)
`JDL". Defendants. Jul. 30, 2010.
`Document 0429-Declaration of Jeffery D. Baxter-Including
`Exhibits: J, K, L, M ,N ,0, P, Q, R, S, T, U, Z, AA, KK, LL.
`Defendants. Jul. 30, 2010.
`Document 0430-Defendants RIM, Samsung, HTC, LG and
`Pantech's response to plaintiffFractus SA's opening claim construc(cid:173)
`tion brief. Defendants. Jul. 30, 2010.
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1001.0006
`
`

`

`US 9,054,421 B2
`Page 7
`
`(56)
`
`References Cited
`
`OTHER PUBLICATIONS
`
`Document 0430-Defendants RIM, Samsung, HTC, LG and
`Pantech's response to plaintiffFractus SA's opening claim construc(cid:173)
`tion brief-Exhibit I-Chart of Agreed Terms and Disputed Terms.
`Defendants. Jul. 30, 2010.
`Document 0430-Defendants RIM, Samsung, HTC, LG and
`Pantech's response to plaintiffFractus SA's opening claim construc(cid:173)
`tion brief-Exhibit 2-Family Tree of Asserted Patents. Defendants.
`Jul. 30, 2010.
`Document 0430-Defendants RIM, Samsung, HTC, LG and
`Pantech's response to plaintiffFractus SA's opening claim construc(cid:173)
`tion brief-Exhibit 33-Excerpt from Plaintiffs '868 pat. inf.cont.
`for Samsung SPH M540. Defendants. Jul. 30, 2010.
`Document 0430-Defendants RIM, Samsung, HTC, LG and
`Pantech's response to plaintiffFractus SA's opening claim construc(cid:173)
`'431 patent
`tion brief-Exhibit 34-Excerpts from Plaintiffs
`Infringement Contentions of HTC Diamond. Defendants. Jul. 30,
`2010.
`Document 0430-Defendants RIM, Samsung, HTC, LG and
`Pantech's response to plaintiffFractus SA's opening claim construc(cid:173)
`tion brief-Exhibit 41-Demonstrative re: counting segments.
`Defendants. Jul. 30, 2010.
`Document 0430-Defendants RIM, Samsung, HTC, LG and
`Pantech's response to plaintiffFractus SA's opening claim construc(cid:173)
`tion brief-Exhibit 42-Demonstrative showing how straight seg(cid:173)
`ments can be fitted over a curved surface. Defendants. Jul. 30, 2010.
`Document 0430-Defendants RIM, Samsung, HTC, LG and
`Pantech's response to plaintiffFractus SA's opening claim construc(cid:173)
`tion brief-Exhibit 57-Excerpts from Plaintiffs '868 and '762 Pat.
`Int. cont. for RIM 8310. Defendants. Jul. 30, 2010.
`Document 0440-Fractus's opposition to defendants' motion for
`summary judgement of invalidity based on indefiniteness and lack of
`written description for certain terms. Susman Godfrey. Aug. 16,
`2010.
`Document 0440-1-Expert declaration by Dr. D. Jaggard including
`exhibits ( curriculum and datasheets from Cushcraft, Antenova,
`Ethertronics and Taoglas). Susman Godfrey. Aug. 16, 2010.
`Document 0440-2-Declaration of Micah Howe in support of
`Fractus SA opposition to defendants' motion for summary judge(cid:173)
`ment ofinvalidity based on indefiniteness and lack of written descrip(cid:173)
`tion for certain terms. Heim, Payne and Chorus LLP. Aug. 16, 2010.
`Document 0452-Defendant's reply in support of their motion for
`summary judgment of invalidity based on indefiniteness and lack of
`written description for certain terms with exhibits WW, BBB, EEE,
`GGG, HHH, III, KKK, MMM, NNN, 000, PPP, Q. Defendants.
`Aug. 30, 2010.
`Document 047 5---0rder. Provisional claim construction and motion
`for summary judgement. Provisional markman order. Court. Nov. 9,
`2010.
`Document 0526-Memorandum order and opinion. Court. Dec. 17,
`2010.
`Document 0575-Fractus 's Objections to claimconstructionmemo(cid:173)
`randum and order. Susman Godfrey. Jan. 14, 2011.
`Document 0582-Memorandum opinion and order. Court. Jan. 20,
`2011.
`Document 0583-Defendant's notice of compliance regarding sec(cid:173)
`ond amended invalidity contentions. Defendants. Jan. 21, 2011.
`Document 0607-Declaration of Thomas E. Nelson-Exhibit
`A-Antenna photos. Defendants. Feb. 3, 2011.
`Document 0609-Fractus' reply to defendant's motion for reconsid(cid:173)
`eration of, and objections to, magistrate Judge Love's markman
`order. Susman Godfrey. Feb. 4, 2011.
`Document 0611-Report and recommendation of United States
`magistrate judge. Court. Feb. 8, 2011.
`Document 0622---0rder adopting report and recommendation of
`magistrate judge. Court. Feb. 11, 2011.
`Document 0624-Notice of compliance with motion practice orders.
`Susman Godfrey. Feb. 14, 2011.
`
`Document 0641-Defendant HTC America, Inc's second amended
`answer and counterclaim to plaintiff's second amended complaint.
`Defendants. Feb. 25, 2011.
`Document 0642-Defendant HTC Corporation's second amended
`answer and counterclaim to plaintiff's second amended complaint.
`Defendants. Feb. 25, 2011.
`Document 0645-Reply brief in support of Defendant's motion for
`reconsideration of the court's ruling on the term "at least a portion" in
`the court's Dec. 17, 2010 claim construction order based on newly(cid:173)
`available evidence. Defendants. Feb. 25, 2011.
`Document 0647-Defendants Samsung Electronics Co LTD (et al)
`second amended answer and counterclaims to the second amended
`complaint of plaintiffFractus SA-Document 647. Defendants. Feb.
`28, 2011.
`Adcock , M. D New type feed for high speed conical scanning.
`Symposium on the USAF Antenna Research and Development Pro(cid:173)
`gram, 2nd. Aug. 11, 1952.
`Addison , P. S. Fractals and Chaos-An illustrated course-Full.
`Institute