Granted Patent
Utility
US 4,941,493 · App. 07/232,661
Device for washing and drying the inside tank of a tanker truck
Inventor:
Tom Wieringa
Patented Case
View Patent ↗
Granted: Jul 17, 1990
Filed: Aug 15, 1988
Inventor
Tom Wieringa
Assignee (at issue)
Carry Companies of Illinois
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.