Granted Patent
Utility
US 4,286,739 · App. 06/055,369
Convertible back pack frame
Inventors:
Philip B. Silcott, James H. Stubbings
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Jul 6, 1979
Inventors
Philip B. Silcott
James H. Stubbings
Assignee (at issue)
Potomac Applied Mechanics, 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.