Granted Patent
Utility
US 4,153,863 · App. 05/789,532
DC Motor controller
Inventors:
John J. Schachte, Geoffrey A. Ross
Patented Case
View Patent ↗
Granted: May 8, 1979
Filed: Apr 20, 1977
Inventors
John J. Schachte
Geoffrey A. Ross
Assignee (at issue)
Colt Industries Operating Corp. (Pratt & Whitney Machine Tool Division)
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.