Granted Patent
Utility
US 4,535,326 · App. 06/400,566
Liner deterioration warning for fluid movers
Inventors:
Lance A. Mullins, Michael Self
Patented Case
View Patent ↗
Granted: Aug 13, 1985
Filed: Jul 21, 1982
Inventors
Lance A. Mullins
Michael Self
Assignee (at issue)
Joy Manufacturing Company
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.