Inventor
James T. Walker
Inventor
Palo Alto, CA, US
Overview
Patents· 21 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H03Kprimary
H03KPulse technique28%
H05BElectric heating21%
H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems14%
G11CStatic stores10%
Y02BClimate change mitigation technologies related to buildings, e.g. housing, house appliances or related end-user applications7%
G01KMeasuring temperature3%
G06FElectric digital data processing3%
H03FAmplifiers3%
H05KPrinted circuits3%
LOCD13%
PatentTitleYear
9,837,889Power converter with inductance invariance20179,621,149'Bootstrapped switch with a highly linearized resistance'20179,246,378'Method and apparatus for extending the power output range of a power converter used for a lighting system'20169,143,131'Field-programmable gate array'20159,100,008'Bootstrapped switch with a highly linearized resistance'20158,963,430'Circuit for detection and control of LED string operation'20158,558,598'Phase shift generating circuit'20138,154,898'Current driven bipolar high voltage driver for capacitive loads'20127,659,756'MOSFET transistor amplifier with controlled output current'20107,564,263'High-speed logic signal level shifter'20097,554,378'Fast DC coupled level translator'20097,538,581'Fast AC coupled level translator'20097,480,191'High speed logic level shifter'20096,841,950'Dimmable electrolumanescent lamp drivers and method therefor'20056,304,461'DC power converter having bipolar output and bi-directional reactive current transfer'20015,667,305'Low force high pressure port'19974,922,452'10 Gigasample/sec two-stage analog storage integrated circuit for transient digitizing and imaging oscillography'19904,811,285'Analog storage integrated circuit'19894,593,381'Microplex chip for use with a microstrip detector'1986D0245112'Telephone station set base'19773,937,980'Printed wiring circuit guard ring'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976Patents assigned to AERONUTRONIC FORD CORP (1)· patent assignee history
1976Based in Norristown, PA, US· patent location history
1977Based in Matawan, NJ, US· patent location history
1986–1989Patents assigned to UNIV LELAND STANFORD JUNIOR (2)· patent assignee history
1986–2017Based in Palo Alto, CA, US· patent location history
1997Based in Plymouth, MI, US· patent location history
2001–2017Patents assigned to SUPERTEX INC (11)· patent assignee history
2012–2015Patents assigned to WALKER JAMES T (4)· patent assignee history
2015–2017Patents assigned to MICROCHIP TECH INC (4)· patent assignee history
2015Based in York, GB· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SUPERTEX INC | 11 | 2001–2017 |
| MICROCHIP TECH INC | 4 | 2015–2017 |
| WALKER JAMES Tself | 4 | 2012–2015 |
| UNIV LELAND STANFORD JUNIOR | 2 | 1986–1989 |
| AERONUTRONIC FORD CORP | 1 | 1976 |
Locations
| Location | Patents | Span |
|---|---|---|
| Palo Alto, California, US | 17 | 1986–2017 |
| York, GB | 1 | 2015 |
| Plymouth, MI, US | 1 | 1997 |
| Matawan, New Jersey, US | 1 | 1977 |
| Norristown, Pennsylvania, US | 1 | 1976 |