Granted Patent
Utility
US 4,774,857 · App. 07/011,323
Two speed axle assembly
Inventors:
Charles F. Heine, Richard L. Pifer, James A. Krisher
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Feb 5, 1987
Inventors
Charles F. Heine
Richard L. Pifer
James A. Krisher
Assignee (at issue)
DANA LIMITED
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.