Granted Patent
Utility
US 4,811,225 · App. 07/025,389
Ratio control technique for continuously variable transmission
Inventors:
Werner P. Petzold, William P. Umlauf
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: Mar 13, 1987
Inventors
Werner P. Petzold
William P. Umlauf
Assignee (at issue)
Borg-Warner Automotive, 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.