Granted Patent
Utility
US 4,304,422 · App. 06/122,211
Tube coupling with frangible sleeve
Inventor:
Albert J. Schwarz
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Feb 19, 1980
Inventor
Albert J. Schwarz
Assignee (at issue)
Gould 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.