Granted Patent
Utility
US 4,249,543 · App. 06/090,783
Rotor access module
Inventor:
Edward W. Rowland-Hill
Patented Case
View Patent ↗
Granted: Feb 10, 1981
Filed: Nov 2, 1979
Inventor
Edward W. Rowland-Hill
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.