Granted Patent
Utility
US 4,264,691 · App. 06/057,412
Battery interseparator
Inventors:
Dennis D. O'Rell, Nguyen V. Hien, Joseph T. Lundquist, Christian B. Lundsager
Patented Case
View Patent ↗
Granted: Apr 28, 1981
Filed: Jul 13, 1979
Inventors
Dennis D. O'Rell
Nguyen V. Hien
Joseph T. Lundquist
Christian B. Lundsager
Assignee (at issue)
W. R. Grace & Co.
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.