Granted Patent
Utility
US 4,297,753 · App. 06/073,416
Patient transfer device
Inventor:
Robert J. Langren
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Sep 7, 1979
Inventor
Robert J. Langren
Assignee (at issue)
WARNER-LAMBERT COMPANY LLC
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.