Granted Patent
Utility
US 4,779,841 · App. 06/883,699
Assembly and method for installing and retaining valve seals
Inventors:
Andrew Pupillo, Jon A. Babcock
Patented Case
View Patent ↗
Granted: Oct 25, 1988
Filed: Jul 9, 1986
Inventors
Andrew Pupillo
Jon A. Babcock
Assignee (at issue)
Posi-Seal International, Inc.
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.