Air assisted alkaline cells
CA 2032530 C · Owner: Urry, Lewis F. · Inventors: Urry, Lewis F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An air assisted alkaline cell having a cathode made from a mixture of porous manganese dioxide and substantially less porous manganese dioxide. The substantially solid MnO2 is the major component of the cathode with the porous MnO2 being present in an amount effective to enable recharging of the cathode of the air assisted alkaline cell in the presence of air. The composition of the cathode is disclosed as well as the method of making the cathode. An improved air assisted alkaline cell is also disclosed, as well as the method for making the improved air assisted cell.
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 December 18, 1990 and granted October 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 2012.
- 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.