Treatment of drilled copper clad thermoplastic laminates using concentrated sulfuric acid
CA 1267350 C · Owner: Amoco Corporation · Inventors: Rimsa, Stephen B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure Copper clad thermoplastic laminates having holes drilled therein may be treated to render the hole walls thereof adherently electrolessly platable by immersing the laminate in concentrated sulfuric acid, optionally containing an oxidizing agent and, then removing sulfuric acid from the laminate thus treated. As oxidizing agent, ammonium persulfate is preferred. S P E C I F I C A T I O N
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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 April 3, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 3, 2007.
- 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.