Corrosion-inhibiting coating compositions
CA 2005983 C · Owner: Braig, Adalbert · Inventors: Braig, Adalbert; Phillips, Emyr
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a corrosion-inhibiting coating composition comprising:, a) an acid-sensitive film former; and b) as a corrosion inhibitor, an effective amount of a salt of i) an aliphatic or cycloaliphatic monodi tri- or tetra-carboxylic acid , which is substituted in its aliphatic or cycloaliphatic radical by at least one group of the formula, (see fig. I), in which each R independently of the others is hydrogen alkyl, halogenoalkyl, alkoxy, alkylthio alkylsulfonyl, cycloalkyl, phenyl, alkylphenyl phenylalkyl, halogen, -CN, -NO2, -COOH COOalkyl, -OH or a primary, secondary or tertiary amino or carbamoyl, group; with ii) n molar equivalents of an amine of the formula (see …
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 December 19, 1989 and granted September 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 19, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 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.