Granted Patent
Utility
US 4,244,821 · App. 05/952,953
Backflushing system
Inventor:
Allen E. Molvar
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: Oct 20, 1978
Inventor
Allen E. Molvar
Assignee (at issue)
Clevepak 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.