Granted Patent
Utility
US 4,848,508 · App. 07/104,025
Method and apparatus for controlling wheel slip in a full-time four wheel drive vehicle
Inventors:
Richard L. Smirl, Mark J. Fogelberg
Patented Case
View Patent ↗
Granted: Jul 18, 1989
Filed: Oct 5, 1987
Inventors
Richard L. Smirl
Mark J. Fogelberg
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.