Granted Patent
Utility
US 4,875,710 · App. 07/147,526
Abrasive threaded fiberglass pipe joint
Inventor:
Hector P. Mercado
Patented Case
View Patent ↗
Granted: Oct 24, 1989
Filed: Jan 25, 1988
Inventor
Hector P. Mercado
Assignee (at issue)
Ameron, 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.