Alkaline resol phenol-aldehyde resin binder compositions
CA 2088199 C · Owner: Smith, Garry · Inventors: Smith, Garry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A binder composition for producing articles of bonded particulate material such as foundry moulds or cores comprises an alkaline aqueous solution of a resol phenol-aldehyde resin, an oxyanion which can form a stable complex with the resin, and a propylene glycol alkyl ether, in which the amount of alkali present in the solution is sufficient to substantially prevent stable complex formation between the resin and the oxyanion and the amount of propylene glycol alkyl ether is such that the propylene glycol alkyl ether is miscible with the aqueous solution. Bonded articles are produced by passing carbon dioxide gas through articles formed from a mixture of particulate material and the binder …
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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 January 27, 1993 and granted April 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 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.