Granted Patent
Utility
US 4,297,918 · App. 06/050,745
Control systems for steplessly-variable ratio transmissions
Inventor:
Forbes G. Perry
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Jun 21, 1979
Inventor
Forbes G. Perry
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT CORPORATION
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.