Lead acid storage battery
CA 2040673 C · Owner: Hikawa, Hideki · Inventors: Hikawa, Hideki; Yamaguchi, Osamu; Morimoto, Yoshinari
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lead acid storage battery comprises a group of electrode plates. A negative plate is enclosed in an envelope separator joined together at its both edges by welding or mechanical sealing. A glass mat is separately provided between the separator and a positive plate. The glass mat has a width at least equal to the width of the separator except its both edges.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed April 17, 1991 and granted January 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.