Granted Patent
Utility
US 5,337,591 · App. 07/907,872
Machine and method of making duct coupling
Inventors:
William H. Fordee, Henry M. Keating
Patented Case
View Patent ↗
Granted: Aug 16, 1994
Filed: Jul 2, 1992
Inventors
William H. Fordee
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.