Granted Patent
Utility
US 4,167,971 · App. 05/915,830
Hanger apparatus for suspending pipes
Inventor:
William S. Cowan
Patented Case
View Patent ↗
Granted: Sep 18, 1979
Filed: Jun 16, 1978
Inventor
William S. Cowan
Assignee (at issue)
Armco 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.