Granted Patent
Utility
US 5,287,588 · App. 07/836,471
Upholstery and carpet cleaning equipment including external heat exchanger
Inventors:
Bernard Gurstein, Russell Gurstein
Patented Case
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Granted: Feb 22, 1994
Filed: Feb 18, 1992
Inventors
Bernard Gurstein
Russell Gurstein
Assignee (at issue)
U.S. Products
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.