Granted Patent
Utility
US 4,800,948 · App. 07/043,978
Method of forming a thermally activated pressure relief valve
Inventor:
James E. Visnic
Patented Case
View Patent ↗
Granted: Jan 31, 1989
Filed: Apr 29, 1987
Inventor
James E. Visnic
Assignee (at issue)
Aluminum Company of America
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.