US Patent: 8,923 - Differential safety-valve


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US Patent: 8,923

Differential safety-valve

Patentee:

John McClintic (exact or similar names) - Philadelphia, PA

USPTO Classifications:

137/508

Tool Categories:

propulsion and energy : steam apparatus : steam safety valves

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

H. H. Young

T. S. Smith

Patent Dates:
Granted:	May 04, 1852

Patent Pictures:

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Description:

John McClintic of Chambersburg, Pa., was granted some notable early (1825 to 1829) patents for woodworking machinery. By the early 1840s he had moved to Philadelphia, he was still there in 1851 so it is very likely that this patent is to the same John McClintic.