Corrosion inhibitors
CA 2087895 C · Owner: Phillips, Emyr · Inventors: Phillips, Emyr; Armstrong, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Coating composition comprising:, A) an organic film-forming binder; and B) a corrosion-inhibiting amount of a water-insoluble salt of i) a carboxylic acid, having the formula (I):, in which a is 0 or an integer ranging from 1 to 5; m and n independently, are , 0 or an, integer ranging from 1 to 10; X1 is O S or -C(R5)(R6) provided that, if m and n are, each 0, then X1 is not O or S; R1 R2, R3, R4, R5 and R6 are the same or different and, each is hydrogen, C1-C15 alkyl C2-C15 alkenyl, C3-C12 cycloalkyl, C2-C15 alkyl, interrupted by one or more O-, N- or S-atoms or each is C6-C10 aryl, C7-C12 , aralkyl or C7-C12 aralkenyl each optionally substituted by one to five groups R or , any two …
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 January 22, 1993 and granted October 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 22, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2015.
- 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.