Bath solution and process for the removal of lead/tin, lead or tin coatings from copper or nickel surfaces
CA 1313611 C · Owner: Kollmorgen Corporation · Inventors: Mika, Gunter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a stripping solution for the removal of lead and tin, lead or tin coatings applied to copper or nickel surfaces. The caustic solution consists of nitric acid and contains one or several inhibitor(s) such as block copolymers of propylene oxide and ethylene oxide, or polyethylene glycols, and/or polyols with a molecular weight in excess of 2000.
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 February 16, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 16, 2010.
- 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.