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Patent Assignment Assignor Details
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Assignor Name : TRCKA, DARRYL E.
Total Assignments: 18
Assignment: 1
Reel/Frame:006812/0014   Pages: 3
Recorded: 12/13/1993
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
TRCKA, DARRYL E.
Exec Dt:
11/02/1993
2
CHACE, DAVID M.
Exec Dt:
11/20/1993
Assignee
1
WESTERN ATLAS INTERNATIONAL, INC.
10205 WESTHEIMER ROAD
HOUSTON, TEXAS 77042
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
5404752
NONE
08127945
Correspondence name and address
WILLIAM A. KNOX
8310 ASHCROFT DRIVE
HOUSTON, TEXAS 77096
Assignment: 2
Reel/Frame:008817/0285   Pages: 3
Recorded: 11/14/1997
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
CHACE, DAVID M.
Exec Dt:
11/14/1997
2
TRCKA, DARRYL E.
Exec Dt:
11/14/1997
3
MAYER, RENE W.
Exec Dt:
11/14/1997
Assignee
1
WESTERN ATLAS INTERNATIONAL, INC.
P.O. BOX 1407
10205 WESTHEIMER ROAD
HOUSTON, TEXAS 77042
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
5949069
NONE
08970253
Correspondence name and address
RICHARD A. FAGIN
10205 WESTHEIMER ROAD
P.O. BOX 1407
HOUSTON, TX 77042-3115
Assignment: 3
Reel/Frame:015198/0247   Pages: 4
Recorded: 04/07/2004
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
ENGELS, OLE G.
Exec Dt:
04/07/2004
2
GILCHRIST, W. ALLEN
Exec Dt:
03/29/2004
3
TRCKA, DARRYL E.
Exec Dt:
03/29/2004
Assignee
1
BAKER HUGHES INCORPORATED
3900 ESSEX LANE
SUITE 1200
HOUSTON, TEXAS 77027
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
7117733
US20050223790
10819665
Correspondence name and address
MADAN, MOSSMAN & SRIRAM, P.C.
KAUSHIK P. SRIRAM
2603 AUGUSTA
SUITE 700
HOUSTON, TX 77057
Assignment: 4
Reel/Frame:015623/0574   Pages: 4
Recorded: 06/29/2004
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
RILEY, STEPHEN
Exec Dt:
06/09/2004
2
GUIVARCH, BENOIT J.
Exec Dt:
06/09/2004
3
TRCKA, DARRYL E.
Exec Dt:
06/28/2004
4
CHACE, DAVID M.
Exec Dt:
06/24/2004
Assignee
1
BAKER HUGHES INCORPORATED
3900 ESSEX LANE, SUITE 1200
HOUSTON, TEXAS 77027
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
7186971
US20050284626
10879620
Correspondence name and address
MADAN, MOSSMAN & SRIRAM, P.C.
KAUSHIK P. SRIRAM
2603 AUGUSTA, SUITE 700
HOUSTON, TEXAS 77057
Assignment: 5
Reel/Frame:016720/0006   Pages: 4
Recorded: 06/22/2005
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
RILEY, STEPHEN
Exec Dt:
06/09/2004
2
GUIVARCH, BENOIT J.
Exec Dt:
06/09/2004
3
TRCKA, DARRYL E.
Exec Dt:
06/28/2004
4
CHACE, DAVID M.
Exec Dt:
06/24/2004
Assignee
1
BAKER HUGHES INCORPORATED
3900 ESSEX LANE, SUITE 1200
HOUSTON, TEXAS 77027
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
7227129
US20050284627
11158500
Correspondence name and address
MADAN, MOSSMAN & SRIRAM, P.C.
2603 AUGUSTA, SUITE 700
HOUSTON, TEXAS 77057
Assignment: 6
Reel/Frame:015869/0405   Pages: 3
Recorded: 09/30/2004
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
GILCHRIST, ALLEN
Exec Dt:
09/14/2004
2
TRCKA, DARRYL E.
Exec Dt:
09/29/2004
Assignee
1
BAKER HUGHES INCORPORATED
3900 ESSEX LANE
SUITE 1200
HOUSTON, TEXAS 77027
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
7253402
US20050067563
10955867
Correspondence name and address
MADAN, MOSSMAN & SRIRAM, P.C.
KAUSHIK P. SRIRAM
2603 AUGUSTA
SUITE 700
HOUSTON, TEXAS 77057
Assignment: 7
Reel/Frame:020101/0414   Pages: 3
Recorded: 11/13/2007
Attorney Dkt #:594-35890-USC
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
GILCHRIST, ALLEN
Exec Dt:
09/14/2004
2
TRCKA, DARRYL E.
Exec Dt:
09/29/2004
Assignee
1
BAKER HUGHES INCORPORATED
2929 ALLEN PARKWAY, SUITE 2100
HOUSTON, TEXAS 77019-2118
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
NONE
US20090224146
11835241
Correspondence name and address
MADAN, MOSSMAN & SRIRAM, P.C.
2603 AUGUSTA DRIVE
SUITE 700
HOUSTON, TX 77057-5662
Assignment: 8
Reel/Frame:016333/0582   Pages: 5
Recorded: 06/14/2005
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
ENGELS, OLE G.
Exec Dt:
04/02/2005
2
GILCHRIST, W. ALLEN
Exec Dt:
03/31/2005
3
PATTERSON, DOUGLAS J.
Exec Dt:
03/31/2005
4
TRCKA, DARRYL E.
Exec Dt:
04/04/2005
Assignee
1
BAKER HUGHES INCORPORATED
3900 ESSEX LANE
SUITE 1200
HOUSTON, TEXAS 77027
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
NONE
US20050226098
11100284
Correspondence name and address
MADEN, MOSSMAN & SRIRAM, P.C.
KAUSHIK P. SRIRAM
2603 AUGUSTA
SUITE 700
HOUSTON, TX 77057
Assignment: 9
Reel/Frame:016457/0764   Pages: 5
Recorded: 04/06/2005
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
ENGELS, OLE G.
Exec Dt:
04/02/2005
2
ALLEN, GILCHRIST W.
Exec Dt:
03/31/2005
3
PATTERSON, DOUGLAS J.
Exec Dt:
03/31/2005
4
TRCKA, DARRYL E.
Exec Dt:
04/04/2005
Assignee
1
BAKER HUGHES INCORPORATED
3900 ESSEX LANE
SUITE 1200
HOUSTON, TEXAS 77027
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
NONE
US20050226098
11100284
Correspondence name and address
MADAN, MOSSMAN & SRIRAM, P.C.
2603 AUGUSTA
SUITE 700
HOUSTON, TX 77057
Assignment: 10
Reel/Frame:016778/0981   Pages: 9
Recorded: 07/12/2005
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
GILLEN, MICHAEL
Exec Dt:
06/10/2005
2
ENGELS, OLE G.
Exec Dt:
06/06/2005
3
GILCHRIST, W. ALLEN
Exec Dt:
06/06/2005
4
TRCKA, DARRYL E.
Exec Dt:
06/13/2005
5
KRUSPE, THOMAS
Exec Dt:
07/07/2005
6
CHEN, SONGHUA
Exec Dt:
06/06/2005
Assignee
1
BAKER HUGHES INCORPORATED
3900 ESSEX LANE
SUITE 1200
HOUSTON, TEXAS 77027
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
7301338
US20050257610
11179990
Correspondence name and address
MADAN, MOSSMAN & SRIRAM, P.C.
2603 AUGUSTA, SUITE 700
HOUSTON, TEXAS 77057
Assignment: 11
Reel/Frame:016821/0412   Pages: 4
Recorded: 07/26/2005
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
TRCKA, DARRYL E.
Exec Dt:
07/19/2005
2
RILEY, STEVE
Exec Dt:
07/18/2005
3
GUO, PINGJUN
Exec Dt:
07/18/2005
Assignee
1
BAKER HUGHES INCORPORATED
3900 ESSEX LANE
SUITE 1200
HOUSTON, TEXAS 77027
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
7361887
US20070023624
11189455
Correspondence name and address
MADAN, MOSSMAN & SRIRAM, P.C.
2603 AUGUSTA
SUITE 700
HOUSTON, TX 77057
Assignment: 12
Reel/Frame:016823/0589   Pages: 4
Recorded: 07/27/2005
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
TRCKA, DARRYL E.
Exec Dt:
07/19/2005
2
RILEY, STEVE
Exec Dt:
07/18/2005
3
GUO, PINGJUN
Exec Dt:
07/18/2005
Assignee
1
BAKER HUGHES INCORPORATED
3900 ESSEX LANE
SUITE 1200
HOUSTON, TEXAS 77027
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
7365308
US20070023623
11189388
Correspondence name and address
MADAN, MOSSMAN & SRIRAM, P.C.
2603 AUGUSTA
SUITE 700
HOUSTON, TEXAS 77057
Assignment: 13
Reel/Frame:016832/0062   Pages: 4
Recorded: 07/26/2005
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
TRCKA, DARRYL E.
Exec Dt:
07/19/2005
2
GUO, PINGJUN
Exec Dt:
07/18/2005
3
RILEY, STEVE
Exec Dt:
07/18/2005
4
BAROLAK, JOSEPH GREGORY
Exec Dt:
07/26/2005
5
CHACE, DAVID M.
Exec Dt:
07/25/2005
Assignee
1
BAKER HUGHES INCORPORATED
3900 ESSEX LANE
SUITE 1200
HOUSTON, TEXAS 77027
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
7372018
US20070023625
11189514
Correspondence name and address
MADAN, MOSSMAN & SRIRAM, P.C.
2603 AUGUSTA
SUITE 700
HOUSTON, TEXAS 77057
Assignment: 14
Reel/Frame:017963/0360   Pages: 3
Recorded: 06/09/2006
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
RILEY, STEPHEN
Exec Dt:
06/01/2006
2
TRCKA, DARRYL E.
Exec Dt:
06/01/2006
Assignee
1
BAKER HUGHES INCORPORATED
3900 ESSEX LANE, SUITE 1200
HOUSTON, TEXAS 77027
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
7566869
US20070023626
11450497
Correspondence name and address
MADAN MOSSMAN & SRIRAM, P.C.
2603 AUGUSTA
SUITE 700
HOUSTON, TX 77057
Assignment: 15
Reel/Frame:018002/0677   Pages: 4
Recorded: 06/14/2006
Attorney Dkt #:584-42211-US/BAT-0016
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
RILEY, STEPHEN
Exec Dt:
06/09/2006
2
TRCKA, DARRYL E.
Exec Dt:
06/09/2006
Assignee
1
BAKER HUGHES INCORPORATED
3900 ESSEX LANE
HOUSTON, TEXAS 77027
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
7566867
US20070290127
11453115
Correspondence name and address
DAVID ARNOLD
CANTOR COLBURN LLP
55 GRIFFIN ROAD SOUTH
BLOOMFIELD, CT 06002
Assignment: 16
Reel/Frame:019268/0153   Pages: 6
Recorded: 05/09/2007
Attorney Dkt #:534-42276-US
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
RILEY, STEPHEN
Exec Dt:
04/18/2007
2
CHACE, DAVID
Exec Dt:
04/30/2007
3
TRCKA, DARRYL E.
Exec Dt:
04/18/2007
Assignee
1
BAKER HUGHES INCORPORATED
2929 ALLEN PARKWAY, SUITE 2100
HOUSTON, TEXAS 77019-2118
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
7554081
US20080251710
11734550
Correspondence name and address
MADAN, MOSSMAN & SRIRAM, P.C.
2603 AUGUSTA, SUITE 700
HOUSTON, TX 77057
Assignment: 17
Reel/Frame:019942/0166   Pages: 9
Recorded: 10/10/2007
Attorney Dkt #:424-36679-USD
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
GILLEN, MICHAEL
Exec Dt:
10/02/2007
2
ENGELS, OLE G.
Exec Dt:
10/03/2007
3
GILCHRIST, W. ALLEN
Exec Dt:
08/29/2007
4
TRCKA, DARRYL E.
Exec Dt:
08/30/2007
5
KRUSPE, THOMAS
Exec Dt:
10/10/2007
6
CHEN, SONGHUA
Exec Dt:
08/29/2007
Assignee
1
BAKER HUGHES INCORPORATED
2929 ALLEN PARKWAY, SUITE 2100
HOUSTON, TEXAS 77019-2118
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
7565833
US20080021654
11782212
Correspondence name and address
MADAN, MOSSMAN & SRIRAM, P.C.
2603 AUGUSTA, SUITE 700
HOUSTON, TX 77057-5662
Assignment: 18
Reel/Frame:049632/0279   Pages: 7
Recorded: 01/15/2019
Attorney Dkt #:114-0005US
Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Assignors
1
TRCKA, DARRYL E.
Exec Dt:
04/01/2015
2
RILEY, STEVE
Exec Dt:
11/17/2008
Assignee
1
WEATHERFORD TECHNOLOGY HOLDINGS, LLC
2000 ST. JAMES PLACE
HOUSTON, TEXAS 77056
Property
 
Pat #
Pub #
Intl #
App #
 
 
 
 
 
 
 
 
 
 
 
10215880
NONE
15725051
Correspondence name and address
LEWIS & REESE, PLLC
11625 SPRING CYPRESS RD.
SUITE A
TOMBALL, TX 77377

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