Granted Patent
Utility
US 4,239,097 · App. 05/933,391
Multiple stage vibration damper assembly
Inventors:
John F. Greacen, Kerry G. Knight, Thaddeus Lech, Jr.
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Aug 14, 1978
Inventors
John F. Greacen
Kerry G. Knight
Thaddeus Lech, 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.