Granted Patent
Utility
US 5,252,905 · App. 07/132,614
Driving system for single phase A-C induction motor
Inventors:
Frank E. Wills, Jacob E. Shaffer, Jr.
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Dec 10, 1987
Inventors
Frank E. Wills
Jacob E. Shaffer, Jr.
Assignee (at issue)
York International Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.