Method of abrading a hardened resin
CA 2001834 A1 · Owner: Ogitani, Osamu · Inventors: Ogitani, Osamu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A method of treating a metal-plated board for the removal of a hardened, alkali-soluble resin layer therefrom comprising the steps of:, (a) contacting a surface of the resin layer with an aqueous alkaline liquid such as an aqueous sodium carbonate solution to swell the surface;, (b) abrading the resin layer having the swollen surface, step (b) being preceded by or simultaneous with step (a); and, (c) then washing the abraded surface with an aqueous neutral liquid such as water.
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 31, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 31, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 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.