Granted Patent
Utility
US 5,921,152 · App. 09/017,828
Optional multi-ratio gear transmission system
Inventor:
Jifeng Wang
Patented Case
View Patent ↗
Granted: Jul 13, 1999
Filed: Feb 3, 1998
Inventor
Jifeng Wang
Assignee (at issue)
Morgan Construction 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.