Granted Patent
Utility
US 4,908,895 · App. 07/325,937
Air mattress
Inventor:
Robert A. Walker
Patented Case
View Patent ↗
Granted: Mar 20, 1990
Filed: Mar 20, 1989
Inventor
Robert A. Walker
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.