Granted Patent
Utility
US 4,272,109 · App. 06/043,335
Ring gasket retainer for flanged connectors
Inventor:
Arthur G. Ahlstone
Patented Case
View Patent ↗
Granted: Jun 9, 1981
Filed: May 29, 1979
Inventor
Arthur G. Ahlstone
Assignee (at issue)
VETCO, 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.