Granted Patent
Utility
US 5,264,304 · App. 07/764,252
Battery separators with T-shaped ribs
Inventors:
Eric D. Kragness, Joseph T. Lundquist
Patented Case
View Patent ↗
Granted: Nov 23, 1993
Filed: Sep 23, 1991
Inventors
Eric D. Kragness
Joseph T. Lundquist
Assignee (at issue)
W.R. Grace & Co. Conn.
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.