Primary dry cell with gas-venting passageway around the cathode mix
CA 1047101 A · Owner: Union Carbide Corporation · Inventors: Urry, Lewis F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Primary dry cell comprising a metal anode cup having a cathode mix therein, separated from the side wall of the anode cup by a porous, ionically permeable separator, and having an open end which is gas-tightly sealed by a closure including a vent, wherein a gasventing passageway is provided around the cathode mix comprising a longitudinal groove in the side wall of the anode cup communicating with the void space defined between the cathode mix and the seal closure. S P E C I F I C A T I O N -1-
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
- Granted January 23, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 23, 1996.
- 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.