Granted Patent
Utility
US 4,642,842 · App. 06/790,248
Rotary scrubber with inwardly retractable foam extractor ring mount
Inventors:
Robert R Hughes, Robert G. Scott
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Oct 22, 1985
Inventors
Robert R Hughes
Robert G. Scott
Assignee (at issue)
Chemical Specialties Manufacturing Corp.
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.