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Douglas Karraker
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New Berlin, WI, US
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Patents Grants
last 30 patents
Information
Patent Grant
DC bus voltage measurement circuit
Patent number
9,419,529
Issue date
Aug 16, 2016
ABB Inc.
Douglas Karraker
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Detection of welded switch contacts in a line converter system
Patent number
8,653,823
Issue date
Feb 18, 2014
ABB Inc.
Kalyan P. Gokhale
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
AC motor bypass with fault annunciation, serial communication and f...
Patent number
7,948,721
Issue date
May 24, 2011
ABB Inc.
Jeffrey A. Brunner
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Method and apparatus for detecting faults in AC to AC, or DC to AC...
Patent number
7,154,277
Issue date
Dec 26, 2006
ABB Inc.
Alpo K. Vallinmaki
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Controller for a wound rotor slip ring induction machine
Patent number
6,741,059
Issue date
May 25, 2004
ABB Automation Inc.
Kalyan P. Gokhale
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Controller for a wound rotor slip ring induction machine
Patent number
6,448,735
Issue date
Sep 10, 2002
ABB Automation Inc.
Kalyan P. Gokhale
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Maximal voltage three-phase PWM without third harmonic injection
Patent number
5,623,219
Issue date
Apr 22, 1997
Douglas W. Karraker
H03 - BASIC ELECTRONIC CIRCUITRY
Patents Applications
last 30 patents
Information
Patent Application
DC BUS VOLTAGE MEASUREMENT CIRCUIT
Publication number
20150253359
Publication date
Sep 10, 2015
ABB INC.
Douglas Karraker
G01 - MEASURING TESTING
Information
Patent Application
DETECTION OF WELDED SWITCH CONTACTS IN A LINE CONVERTER SYSTEM
Publication number
20110298470
Publication date
Dec 8, 2011
ABB OY
Kalyan P. Gokhale
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Application
INVERTER FOR SOLAR CELL ARRAY
Publication number
20110299312
Publication date
Dec 8, 2011
ABB INC.
Douglas W. Karraker
Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information
Patent Application
AC Motor Bypass With Fault Annunication, Serial Communication And F...
Publication number
20090167229
Publication date
Jul 2, 2009
Jeffrey A. Brunner
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Application
Method and apparatus for detecting faults in AC to AC, or DC to AC...
Publication number
20050047035
Publication date
Mar 3, 2005
ABB Inc.
Alpo K. Vallinmaki
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Application
Controller for a wound rotor slip ring induction machine
Publication number
20030071596
Publication date
Apr 17, 2003
ABB Automation Inc./ ABB Industry Oy
Kalyan P. Gokhale
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER