Granted Patent
Utility
US 4,239,244 · App. 05/910,008
Hydraulic piston rod seal
Inventor:
Robert G. Brent
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: May 26, 1978
Inventor
Robert G. Brent
Assignee (at issue)
Textron 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.