Granted Patent
Utility
US 4,369,985 · App. 06/220,161
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Inventors:
Elroy E. Bourgraf, Robert E. Dunn, Ronald D. Vance
Patented Case
View Patent ↗
Granted: Jan 25, 1983
Filed: Dec 24, 1980
Inventors
Elroy E. Bourgraf
Robert E. Dunn
Ronald D. Vance
Assignee (at issue)
Burt Weil
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.