Granted Patent
Utility
US 5,154,988 · App. 07/663,213
Deep cycle battery separators
Inventors:
Wai Ming Choi, James K. Kung
Patented Case
View Patent ↗
Granted: Oct 13, 1992
Filed: Mar 18, 1991
Inventors
Wai Ming Choi
James K. Kung
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.