Granted Patent
Utility
US 4,640,638 · App. 06/592,945
Cleaning system
Inventors:
David J. Bokmiller, Samuel C. Heck
Patented Case
View Patent ↗
Granted: Feb 3, 1987
Filed: Mar 23, 1984
Inventors
David J. Bokmiller
Samuel C. Heck
Assignee (at issue)
Sani-Fresh International, Inc.
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.