Granted Patent
Utility
US 4,239,297 · App. 05/969,028
Radial face seal
Inventor:
Richard E. Livesay
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Dec 13, 1978
Inventor
Richard E. Livesay
Assignee (at issue)
Caterpillar Tractor Co.
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.