Granted Patent
Utility
US 4,453,923 · App. 06/230,981
Variable diameter pulley assembly
Inventor:
Edward H. Cole, Jr.
Patented Case
View Patent ↗
Granted: Jun 12, 1984
Filed: Feb 2, 1981
Inventor
Edward H. Cole, Jr.
Assignee (at issue)
BorgWarner 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.