Granted Patent
Utility
US 4,531,746 · App. 06/648,555
Dual labyrinth fluid seal with fluid slinger
Inventors:
John K. Amdall, Benny Ballheimer
Patented Case
View Patent ↗
Granted: Jul 30, 1985
Filed: Dec 10, 1982
Inventors
John K. Amdall
Benny Ballheimer
Assignee (at issue)
Caterpillar 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.