Granted Patent
Utility
US 4,236,495 · App. 05/950,973
Self locking valve seat insert
Inventor:
Jose Rosan, Jr.
Patented Case
View Patent ↗
Granted: Dec 2, 1980
Filed: Oct 13, 1978
Inventor
Jose Rosan, Jr.
Assignee (at issue)
Rosan, 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.