US Patent: 30,138 - Cut-off valve for steam-engines


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US Patent: 30,138

Cut-off valve for steam-engines

Patentee:

George Frost (exact or similar names) - Brooklyn, NY

USPTO Classifications:

92/254

Tool Categories:

propulsion and energy : steam engines : steam check valves

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

John First

James Frost

Patent Dates:
Granted:	Sep. 25, 1860

Patent Pictures:

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Description:

Witness John First later became a partner in the important woodworking manufacturer First & Pryibil. An earlier patent, 29,035, was granted to John First and co-assigned to the other witness on this patent, James Frost.