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Inventor

John F. Perkins

Inventor
Pittsburgh, PA, US

Overview

6→
Patents
1976–1984
Patent span
Electricity
Primary field (CPC H)

Patents· 6 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

H01Hprimary
H01HElectric switches44%
F01LCyclically operating valves for machines or engines11%
F04BPositive-displacement machines for liquids11%
G01LMeasuring force, stress, torque, work, mechanical power, mechanical efficiency, or fluid pressure11%
G01RMeasuring electric variables11%
G06GAnalogue computers11%
PatentTitleYear
4,471,309'Vacuum detector'19844,403,124'Vacuum circuit interrupter with insulated vacuum monitor resistor'19834,163,131'Dual-compression gas-blast puffer-type interrupting device'19794,068,983'Piston pumps driven by fluid-actuated piston having a constant fluid force against the small area surface'19783,991,292'Dual compression puffer interrupter'19763,976,894'Analog divider circuitry'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1984Patents assigned to WESTINGHOUSE ELECTRIC CORP (4)· patent assignee history
1976Patents assigned to RAYTHEON CO (1)· patent assignee history
1976–1984Based in Pittsburgh, PA, US· patent location history
1976Based in Bedford, MA, US· patent location history
1978Patents assigned to MADAN & CO CHARLES S (1)· patent assignee history
1978Based in Walsall, GB· patent location history
1979Based in Monroeville, PA, US· patent location history
1983Based in Plum Borough, PA, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
WESTINGHOUSE ELECTRIC CORP41976–1984
MADAN & CO CHARLES S11978
RAYTHEON CO11976
Locations
LocationPatentsSpan
Pittsburgh, Pennsylvania, US21976–1984
Plum Borough, Pennsylvania, US11983
Monroeville, Pennsylvania, US11979
Walsall, GB11978
Bedford, Massachusetts, US11976