Granted Patent
Utility
US 4,514,875 · App. 06/475,718
High capacity filter for floor cleaning machines and the like
Inventor:
Philip L. Comer
Patented Case
View Patent ↗
Granted: May 7, 1985
Filed: Mar 16, 1983
Inventor
Philip L. Comer
Assignee (at issue)
MCGRAW-EDISON 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.