Granted Patent
Utility
US 4,635,968 · App. 06/802,513
Method and apparatus for protecting consecutive multiple variable diameter couplings
Inventor:
Karl F. Kuhne
Patented Case
View Patent ↗
Granted: Jan 13, 1987
Filed: Nov 26, 1985
Inventor
Karl F. Kuhne
Assignee (at issue)
Carbide Blast Joints, 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.