Granted Patent
Utility
US 4,252,033 · App. 05/819,835
Variable speed transmission systems
Inventor:
James Triffitt
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Jul 28, 1977
Inventor
James Triffitt
Assignee (at issue)
Lucas Industries Limited
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.