Granted Patent
Utility
US 5,494,638 · App. 08/311,713
Support membrane
Inventor:
Stephen P. Gullick
Patented Case
View Patent ↗
Granted: Feb 27, 1996
Filed: Sep 23, 1994
Inventor
Stephen P. Gullick
Assignee (at issue)
Hypoguard (UK) Limited
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.