Granted Patent
Utility
US 4,487,421 · App. 06/493,321
Pipe gasket with reinforcing means in its base self-energizing
Inventors:
Jim Housas, Anthony J. Reto
Patented Case
View Patent ↗
Granted: Dec 11, 1984
Filed: May 10, 1983
Inventors
Jim Housas
Anthony J. Reto
Assignee (at issue)
Hamilton Kent Manufacturing, 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.