Granted Patent
Utility
US 6,138,293 · App. 09/332,679
Adjustable mounting collar for a retractable cleaning head
Inventor:
Lester R. Mathews
Patented Case
View Patent ↗
Granted: Oct 31, 2000
Filed: Jun 14, 1999
Inventor
Lester R. Mathews
Assignee (at issue)
Caretaker Systems, 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.