Granted Patent
Utility
US 4,278,301 · App. 06/081,776
Tread belt and drive having involute gear drive
Inventors:
Robert A. Gregor, Ned L. Morgan
Patented Case
View Patent ↗
Granted: Jul 14, 1981
Filed: Oct 4, 1979
Inventors
Robert A. Gregor
Ned L. Morgan
Assignee (at issue)
Bucyrus Erie Company
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.