Granted Patent
Utility
US 4,638,519 · App. 06/719,874
Fluidized hospital bed
Inventor:
Jack H. Hess
Patented Case
View Patent ↗
Granted: Jan 27, 1987
Filed: Apr 4, 1985
Inventor
Jack H. Hess
Assignee (at issue)
Air Plus, 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.