Metallurgical process for manufacturing electrowinning lead and lead alloy electrodes
CA 2299419 C · Owner: Palumbo, Gino · Inventors: Limoges, David L.; Lin, Peter Keng-Yu; Palumbo, Gino
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Lead and lead-alloy anodes for electrowinning metals such as zinc copper, lead, tin, nickel and manganese from sulfuric acid solutions whereby the , electrodes are processed by a repetitive sequence of cold deformation and recrystallization heat treatment, within specified limits of deformation temperature and annealing time, to achieve an improved microstructure consisting of a high frequency of special low .SIGMA. CSL grain boundaries (i.e. 50 %). The resultant electrodes possess significantly improved resistance to intergranular corrosion, and yield (1) extended service life (2) the potential for reduction in electrode thickness with a commensurate increase in the number of …
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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 August 4, 1998 and granted November 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 4, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 4, 2020.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.