Granted Patent
Utility
US 4,311,317 · App. 06/068,245
Lip and radial seal
Inventor:
Harold U. Bartels
Patented Case
View Patent ↗
Granted: Jan 19, 1982
Filed: Aug 20, 1979
Inventor
Harold U. Bartels
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.