Alkaline cell
CA 2100247 C · Owner: Taylor, Alwyn H. · Inventors: Taylor, Alwyn H.; Newman, Gerald H.; Vernhes, Michel J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved high rate alkaline cell (10) having a powdered zinc anode and an anode current collector (20) is obtained by employing an anode current collector (20), made from a foraminous metal. Such a collector pemits power to be drawn from such, cells which can not otherwise be drawn when conventional collectors are used.
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 February 10, 1992 and granted December 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 10, 2014.
- 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.