Granted Patent
Utility
US 4,489,640 · App. 06/470,415
Door operating apparatus
Inventor:
Paul E. Olson
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Feb 28, 1983
Inventor
Paul E. Olson
Assignee (at issue)
American Standard Inc.
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.