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US Patent: 917,944
Rotary Engine
Patentee: Bertram F. Hoffman (exact or similar names) - Buffalo, Erie County, NY USPTO Classifications: 418/173 Tool Categories: propulsion and energy : steam apparatus : rotary steam engines Assignees: Balance Pressure Rotary Engine Co. - Buffalo, Erie County, NY Manufacturer: Not known to have been produced Witnesses: C. B. Hornbeck C. W. Parker E. A. Volk A. G. Dimond	Patent Dates: Applied: Jul. 15, 1908 Granted: Apr. 13, 1909 Patent Pictures: [ 1 | 2 | 3 | 4 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Balance Pressure Rotary Engine Co.

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