Granted Patent
Utility
US 5,442,823 · App. 08/001,381
Wheelchair cushion utilizing foams of different stiffnesses
Inventors:
Allen Siekman, Julius E. Nachod, III
Patented Case
View Patent ↗
Granted: Aug 22, 1995
Filed: Jan 6, 1993
Inventors
Allen Siekman
Julius E. Nachod, III
Assignee (at issue)
INVACARE 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.