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US Patent: 733,149
Method of changing the frequency of single-phase induction-motors
Patentee: Penrose E. Chapman (exact or similar names) - St. Louis, MO USPTO Classifications: 310/172, 310/198, 318/778 Tool Categories: electrical devices : electric motors : induction motors : split phase motors Assignees: None Manufacturer: Not known to have been produced Witnesses: John C. Higdon Alfred A. Eicks	Patent Dates: Applied: Apr. 15, 1902 Granted: Jul. 07, 1903 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for P. E. Chapman Electrical Works, Inc.

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