Granted Patent
Utility
US 4,468,965 · App. 06/439,634
Test method for acetylene cylinders
Inventor:
Philip R. Blackburn
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Nov 5, 1982
Inventor
Philip R. Blackburn
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.