Granted Patent
Utility
US 5,643,131 · App. 08/513,978
Continuously variable transmission with wide transmission ratio range
Inventors:
Walter Kuhn, Hartmut Herter
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Sep 14, 1995
Inventors
Walter Kuhn
Hartmut Herter
Assignee (at issue)
ZF Friedrichshafen AG
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.