Granted Patent
Utility
US 4,862,821 · App. 07/192,763
Mechanism for tensioning a moving chain
Inventor:
Ronald Ballantyne
Patented Case
View Patent ↗
Granted: Sep 5, 1989
Filed: May 10, 1988
Inventor
Ronald Ballantyne
Assignee (at issue)
John T. Hepburn, Limited
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.