Granted Patent
Utility
US 4,377,225 · App. 06/207,827
Clutch driven plate assembly with variable friction area
Inventors:
Thaddeus Lech, Jr., Richard T. Popchock
Patented Case
View Patent ↗
Granted: Mar 22, 1983
Filed: Nov 17, 1980
Inventors
Thaddeus Lech, Jr.
Richard T. Popchock
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.