Naphthalene monocarboxaldehyde brightening agents for electrolytically plating tin
CA 1046977 A · Owner: R.O. Hull And Company · Inventors: Rosenberg, William E.; Eckles, William E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention disclosed herein relates to the electrolytic deposition of bright tin and tin-lead alloy. This invention is embodied in a new plating bath and a plating both additive. The new plating bath includes tin or tin and lead ions, sulfuric acid or fluoboric acid and the new additive. The new additive includes an emulsified naphthalene monocarboxaldehyde with or without a substituted olefin having the general, formula:, in which R2 is carboxyl carboxamido, alkali carboxylate, ammonium. carboxylate amine carboxylate, or alkyl carboxylate and R2, R3, and R4 are hydrogen or lower alkyl. Prior brightener systems require specific surfactants to be used since their brightening ability is …
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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
- Granted January 23, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 23, 1996.
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Timeline
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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.