Aqueous acid bath for the galvanic deposition of shiny copper coatings free from cracks and use of said bath
CA 2001185 C · Owner: Schering Aktiengesellschaft · Inventors: Dahms, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention permits an aqueous acid both for the galvanic deposition of shiny copper coatings free from cracks particularly for reinforcing the conduction pads of printed circuits having excellent breaking elongation. The bath contains at least one copper salt, at least one inorganic acid and when, required, a chloride and a compound containing an amide group an, organic thio compound containing water-soluble groups and, when, required, an oxygen-containing high-molecular organic compound said bath containing a content at least one compound containing at least one lactam alkoxylate as amide group said lactam, alkoxylate being substituted when required.
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 October 23, 1989 and granted August 18, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 23, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2011.
- 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.