Granted Patent
Utility
US 4,289,091 · App. 05/973,042
Closed apparatus for coating the interior of a tank
Inventor:
Hubert H. Warner
Patented Case
View Patent ↗
Granted: Sep 15, 1981
Filed: Dec 13, 1978
Inventor
Hubert H. Warner
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.