Corrosion-inhibited antifreeze/coolant composition containing cyclohexane acid(s)
CA 2051278 C · Owner: Burns, Jeffrey M. · Inventors: Burns, Jeffrey M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A corrosion-inhibited antifreeze composition is disclosed. Specifically the antifreeze composition comprises a major portion of a liquid alcohol freezing point depressant and a minor portion of at least one cyclohexane acid employed as a corrosion inhibitor. Cyclohexane carboxylic said cyclohexane, acetic acid and cyclohexane propionic acid are preferred with, cyclohexane carboxylic acid being most preferred. Other conventional corrosion inhibitors may be employed in conjunction with the cyclohexane acid(s). In another embodiment the present invention relates to a, process for inhibiting the general pitting crevice and deposit, attack corrosion of metals present in the cooling system of an …
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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 September 13, 1991 and granted January 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 13, 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
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.