US Patent: 3,917,981 - Scale Lighting Protection System


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US Patent: 3,917,981

Scale Lighting Protection System

Patentee:

Harry J. Keen (exact or similar names) - Waterford, Caledonia County, VT

USPTO Classifications:

177/245, 310/314, 361/118, 361/120, 73/862.628, 73/862.633, 73/862.634

Tool Categories:

specialty tools : scales and balances

electrical devices : electronic circuitry and apparatus

Assignees:

Colt Industries Operating Corp. - New York, NY

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	Jun. 04, 1974
Granted:	Nov. 04, 1975

Patent Pictures:

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Joel Havens
"Vintage Machinery" entry for Fairbanks, Morse & Co.

Description:

In 1964 Fairbanks, Morse Inc. changed its name to Colt Industries.

Abstract:

The scale lightning protection system protects the electrical resistance strain gages of a scale from the effects of lightning strikes in the vicinity of the scale. Gas filled surge voltage protectors are mounted within the confines of a scale platform and are directly connected to the outputs of a strain gage bridge and to the grounded support for the strain gages forming the bridge.