Granted Patent
Utility
US 4,858,490 · App. 07/107,314
Two motor redundant drive mechanism
Inventor:
Richard W. Grant, III
Patented Case
View Patent ↗
Granted: Aug 22, 1989
Filed: Oct 13, 1987
Inventor
Richard W. Grant, III
Assignee (at issue)
Hughes Aircraft Company
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.