Granted Patent
Utility
US 6,372,983 · App. 09/291,505
Enclosure for electrical components installed in locations where a flammable gas or vapor is expected to be present
Inventor:
L. Brenon Knaggs
Patented Case
View Patent ↗
Granted: Apr 16, 2002
Filed: Apr 14, 1999
Inventor
L. Brenon Knaggs
Assignee (at issue)
Ballard Generation Systems
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.