Granted Patent
Utility
US 5,067,751 · App. 07/558,441
Gasket for field adaptable push-on restrained joint and joint thus produced
Inventors:
Van T. Walworth, Steve L. DeBoalt
Patented Case
View Patent ↗
Granted: Nov 26, 1991
Filed: Jul 27, 1990
Inventors
Van T. Walworth
Steve L. DeBoalt
Assignee (at issue)
AMERICAN Cast Iron Pipe Company
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.