Granted Patent
Utility
US 5,513,899 · App. 08/129,783
Seat cushion for wheelchairs
Inventors:
Gregory A. Michaels, David D. Polacsek
Patented Case
View Patent ↗
Granted: May 7, 1996
Filed: Sep 29, 1993
Inventors
Gregory A. Michaels
David D. Polacsek
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.