Granted Patent
Utility
US 6,406,813 · App. 09/285,494
Lead-acid separators and cells and batteries using such separators
Inventor:
Purushothama Rao
Patented Case
View Patent ↗
Granted: Jun 18, 2002
Filed: Apr 2, 1999
Inventor
Purushothama Rao
Assignee (at issue)
GNB Technologies, Inc.
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.