Granted Patent
Utility
US 4,228,225 · App. 06/051,175
Battery separator
Inventors:
Dennis D. O'Rell, Nan J. Lin
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: Jun 22, 1979
Inventors
Dennis D. O'Rell
Nan J. Lin
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.