Granted Patent
Utility
US 5,221,587 · App. 07/839,867
Lead/sulphuric acid storage battery
Inventors:
Werner Bohnstedt, Christian Radel
Patented Case
View Patent ↗
Granted: Jun 22, 1993
Filed: Feb 21, 1992
Inventors
Werner Bohnstedt
Christian Radel
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.