Granted Patent
Utility
US 4,862,845 · App. 07/192,079
Variable camshaft timing system
Inventors:
Roger P. Butterfield, Franklin R. Smith
Patented Case
View Patent ↗
Granted: Sep 5, 1989
Filed: May 10, 1988
Inventors
Roger P. Butterfield
Franklin R. Smith
Assignee (at issue)
Borg-Warner Transmission and Engine Components 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.