Granted Patent
Utility
US 4,534,669 · App. 06/478,516
Cleaning system with cartridge having valve means
Inventors:
Samuel C. Heck, Lee E. Garrison
Patented Case
View Patent ↗
Granted: Aug 13, 1985
Filed: Mar 24, 1983
Inventors
Samuel C. Heck
Lee E. Garrison
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.