Polyphosphate/azole compositions and the use thereof as copper and copper alloy corrosion inhibitors
CA 2053157 A1 · Owner: Calgon Corporation · Inventors: Rey, Susan P.; Vanderpool, Daniel P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
C-1508, TITLE OF THE INVENTION, "NOVEL POLYPHOSPHATE/AZOLE COMPOSITIONS AND THE USE THEREOF AS COPPER AND COPPER ALLOY CORROSION INHIBITORS", ABSTRACT OF THE INVENTION A polyphosphate in combination with an azole such as an alkyl or alkoxy benzotriazole, mercaptobenzothiazole tolyltriazole, benzotriazole, a substituted benzotriazole and/or 1-phenyl-5-mercaptotetrazole is, used to inhibit the corrosion of metallic surfaces particularly copper surfaces, in contact with an aqueous system. Systems and composition are also claimed.
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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
- Filed October 10, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2013.
- 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
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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.