JOHN J PERKINS
Real Estate Commission in Pittsburgh, PA

License number

Pennsylvania RS090905A

Personal information

See more information about JOHN J PERKINS at radaris.com

Name

Address

Phone

John Perkins

50 E Steuben St, Pittsburgh, PA 15205

Professional information

Dual Compression Puffer Interrupter

US Patent:

3991292, Nov 9, 1976

Filed:

Oct 10, 1974

Appl. No.:

5/513913

Inventors:

John F. Perkins - Pittsburgh PA

Assignee:

Westinghouse Electric Corporation - Pittsburgh PA

International Classification:

H01H 3370

US Classification:

200148A

Abstract:

A fluid-blast circuit interrupter of the puffer type is provided having two pistons connected in tandem to compress arc-extinguishing fluid in two separate volumes and to produce two separate fluid blasts. Valve action is provided to delay the initiation of the second blast until the interrupter contacts have reached the desired separation distance. By changing component dimensions the degree of compression of arc-extinguishing fluid may be changed without delaying the instant of contact separation.

John H. Perkins, Pittsburgh PA - Lawyer

Address:

680 Woodcrest Dr, Pittsburgh 15205
(412) 519-7531

Licenses:

Pennsylvania - Active 1973

Vacuum Detector

US Patent:

4471309, Sep 11, 1984

Filed:

Feb 9, 1982

Appl. No.:

6/347221

Inventors:

William J. Lange - Murrysville PA
Clive W. Kimblin - Pittsburgh PA
John F. Perkins - Pittsburgh PA
Roy E. Voshall - Monroeville PA
Fred Bould - Pittsburgh PA

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

G01L 2134

US Classification:

324463

Abstract:

There is provided a novel vacuum detection means utilizing a high frequency, high voltage device to excite an electrical discharge in a vacuum whose characteristics are dependent on the level of the vacuum contained therein. This discharge current allows the degree of vacuum to be continuously monitored.