Granted Patent
Utility
US 4,635,503 · App. 06/721,607
Bicycle sprocket drive assembly
Inventor:
Wilfred J. Sharon
Patented Case
View Patent ↗
Granted: Jan 13, 1987
Filed: Apr 10, 1985
Inventor
Wilfred J. Sharon
Assignee (at issue)
Thun, 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.