Granted Patent
Utility
US 4,037,513 · App. 05/720,401
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Inventor:
Stephan C. Hobson
Patented Case
View Patent ↗
Granted: Jul 26, 1977
Filed: Sep 3, 1976
Inventor
Stephan C. Hobson
Assignee (at issue)
Portec, 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.