Granted Patent
Utility
US 5,213,374 · App. 07/776,592
Coupling ring and method of making same
Inventor:
Henry M. Keating
Patented Case
View Patent ↗
Granted: May 25, 1993
Filed: Oct 11, 1991
Inventor
Henry M. Keating
Assignee (at issue)
Keating Koupling, 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.