Granted Patent
Utility
US 4,231,806 · App. 05/936,960
Fluid barrier means for parts washer apparatus
Inventor:
William Henry
Patented Case
View Patent ↗
Granted: Nov 4, 1980
Filed: Aug 25, 1978
Inventor
William Henry
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.