Granted Patent
Utility
US 5,542,136 · App. 08/286,765
Portable mattress for treating decubitus ulcers
Inventor:
James G. Tappel
Patented Case
View Patent ↗
Granted: Aug 6, 1996
Filed: Aug 5, 1994
Inventor
James G. Tappel
Assignee (at issue)
STRYKER CORPORATION
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.