Granted Patent
Utility
US 4,861,825 · App. 07/244,131
Aqueous urethane coatings
Inventors:
G. Dale Ernst, Alan R. Schuweiler
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Sep 14, 1988
Inventors
G. Dale Ernst
Alan R. Schuweiler
Assignee (at issue)
TENNANT COMPANY
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.