Granted Patent
Utility
US 4,717,160 · App. 06/853,879
High pressure rotary shaft seal
Inventors:
Gordon T. Zitting, Jay Duke
Patented Case
View Patent ↗
Granted: Jan 5, 1988
Filed: Apr 21, 1986
Inventors
Gordon T. Zitting
Jay Duke
Assignee (at issue)
Microdot 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.