Granted Patent
Utility
US 4,553,775 · App. 06/488,648
Resilient annular seal with supporting liner
Inventor:
Horace P. Halling
Patented Case
View Patent ↗
Granted: Nov 19, 1985
Filed: Apr 26, 1983
Inventor
Horace P. Halling
Assignee (at issue)
Pressure Science Incorporated
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.