Granted Patent
Utility
US 4,722,721 · App. 06/927,205
Synchronous drive system and method of making the same
Inventor:
Robert E. Wetzel
Patented Case
View Patent ↗
Granted: Feb 2, 1988
Filed: Nov 5, 1986
Inventor
Robert E. Wetzel
Assignee (at issue)
Dayco Products, LLC
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.