Granted Patent
Utility
US 4,248,439 · App. 06/136,653
Stabilized seal structure
Inventor:
Glenn M. Haslett
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Oct 15, 1979
Inventor
Glenn M. Haslett
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.