Granted Patent
Utility
US 4,569,097 · App. 06/554,765
Tube cleaners
Inventor:
Marvin Echols
Patented Case
View Patent ↗
Granted: Feb 11, 1986
Filed: Nov 23, 1983
Inventor
Marvin Echols
Assignee (at issue)
Superior I.D. Tube Cleaners Incorporated
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.