Granted Patent
Utility
US 4,228,048 · App. 06/042,657
Foam cleaner for food plants
Inventor:
Thomas C. Tesdahl
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: May 25, 1979
Inventor
Thomas C. Tesdahl
Assignee (at issue)
Chemed Corporation
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.