Granted Patent
Utility
US 4,289,318 · App. 06/133,539
Hydraulic motor balancing ring seal
Inventors:
Douglas A. Cather, Jr., Martin E. Benjamin
Patented Case
View Patent ↗
Granted: Sep 15, 1981
Filed: Mar 24, 1980
Inventors
Douglas A. Cather, Jr.
Martin E. Benjamin
Assignee (at issue)
Garlock, 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.