Granted Patent
Utility
US 5,086,804 · App. 07/644,550
Emergency security device for head of a leaking gas cylinder
Inventor:
Eugene Y. Ngai
Patented Case
View Patent ↗
Granted: Feb 11, 1992
Filed: Jan 23, 1991
Inventor
Eugene Y. Ngai
Assignee (at issue)
Solkatronic Chemicals, 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.