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US Patent: 464,285
Rotary Steam Engine
Patentee: Frederick Meyer (exact or similar names) - Chicago, Cook County, IL USPTO Classifications: 418/176 Tool Categories: propulsion and energy : steam apparatus : rotary steam engines Assignees: Duplex Rotary Engine Co. - Chicago, Cook County, IL Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Oct. 07, 1890 Granted: Dec. 01, 1891 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Duplex Rotary Engine Co.

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