Granted Patent
Utility
US 4,875,309 · App. 07/134,092
Disc cleaner
Inventor:
William Long
Patented Case
View Patent ↗
Granted: Oct 24, 1989
Filed: Dec 17, 1987
Inventor
William Long
Assignee (at issue)
Pangborn 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.