Granted Patent
Utility
US 4,536,689 · App. 06/611,305
Servomotor feedback fault detector
Inventor:
Dale D. Davidson
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: May 17, 1984
Inventor
Dale D. Davidson
Assignee (at issue)
Sperry Corp.
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.