Granted Patent
Utility
US 4,335,559 · App. 06/100,172
Dual pressure closure clipping system for chamber evacuator
Inventor:
Joseph A. Nausedas
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: Dec 4, 1979
Inventor
Joseph A. Nausedas
Assignee (at issue)
Union Carbide 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.