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US Patent: 35,069
Improvement in slide-valves for steam-engines
Patentee: John F. Allen (exact or similar names) - New York, NY USPTO Classifications: 137/625.25 Tool Categories: propulsion and energy : steam engines : steam engine valve gear Assignees: None Manufacturer: Porter-Allen Engine Co. - New York, NY Witnesses: Horace Andrews Charles B. Richards	Patent Dates: Granted: Apr. 29, 1862 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Porter-Allen Engine Co.

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