Granted Patent
Utility
US 4,153,393 · App. 05/787,746
Dual pump operation of coin-operated washing system
Inventor:
James E. Cook
Patented Case
View Patent ↗
Granted: May 8, 1979
Filed: Apr 15, 1977
Inventor
James E. Cook
Assignee (at issue)
Lear Siegler, 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.