Granted Patent
Utility
US 5,981,099 · App. 09/009,115
Pressure relief valve for electric storage batteries
Inventor:
Robert D. Bourbeau
Patented Case
View Patent ↗
Granted: Nov 9, 1999
Filed: Jan 20, 1998
Inventor
Robert D. Bourbeau
Assignee (at issue)
Accuma 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.