Granted Patent
Utility
US 5,628,721 · App. 08/624,300
Back support assembly having an inflatable air cushion
Inventors:
William K. Arnold, Tracy E. Grim
Patented Case
View Patent ↗
Granted: May 13, 1997
Filed: Mar 29, 1996
Inventors
William K. Arnold
Tracy E. Grim
Assignee (at issue)
Royce Medical Company
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.