Granted Patent
Utility
US 4,639,240 · App. 06/797,868
Chainguard
Inventor:
King Liu
Patented Case
View Patent ↗
Granted: Jan 27, 1987
Filed: Nov 14, 1985
Inventor
King Liu
Assignee (at issue)
Schwinn Bicycle 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.