Granted Patent
Utility
US 4,281,561 · App. 06/082,864
Three axes controller
Inventor:
Ernest Groskopfs
Patented Case
View Patent ↗
Granted: Aug 4, 1981
Filed: Oct 9, 1979
Inventor
Ernest Groskopfs
Assignee (at issue)
Spar Aerospace Limited
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.