Granted Patent
Utility
US 4,873,879 · App. 07/093,671
Variable speed transmission
Inventors:
Roger P. Butterfield, Guenter Neumann, Curt A. Wykstra
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Sep 8, 1987
Inventors
Roger P. Butterfield
Guenter Neumann
Curt A. Wykstra
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.