Granted Patent
Utility
US 4,428,589 · App. 06/481,602
Dual operating mode seal assembly
Inventor:
Harold L. Reinsma
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Apr 4, 1983
Inventor
Harold L. Reinsma
Assignee (at issue)
Capterpillar Tractor Co.
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.