Granted Patent
Utility
US 4,498,284 · App. 06/381,892
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Inventor:
Gordon E. Gearhart
Patented Case
View Patent ↗
Granted: Feb 12, 1985
Filed: May 25, 1982
Inventor
Gordon E. Gearhart
Assignee (at issue)
E.V. Camp Steel Works, 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.