Granted Patent
Utility
US 4,634,134 · App. 06/732,201
Mechanical seal
Inventor:
Raymond A. Entrikin
Patented Case
View Patent ↗
Granted: Jan 6, 1987
Filed: May 8, 1985
Inventor
Raymond A. Entrikin
Assignee (at issue)
Epworth Manufacturing Co., 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.