Granted Patent
Utility
US 4,411,138 · App. 06/408,915
Neck tube closure assembly for cryogenic containers
Inventors:
Douglas R. Leithauser, John K. Young
Patented Case
View Patent ↗
Granted: Oct 25, 1983
Filed: Aug 17, 1982
Inventors
Douglas R. Leithauser
John K. Young
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.