Granted Patent
Utility
US 4,484,753 · App. 06/462,464
Rotary shaft seal
Inventor:
Manmohan S. Kalsi
Patented Case
View Patent ↗
Granted: Nov 27, 1984
Filed: Jan 31, 1983
Inventor
Manmohan S. Kalsi
Assignee (at issue)
NL Industries, 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.