Mould release composition for concrete - is oil-in-water emulsion of aliphatic carboxylate ester of branched polyhydric alcohol
CA 2091968 C · Owner: Unichema Chemie B.V. · Inventors: Van Hoorn, Bart
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A biodegradable oil and water emulsion release composition for facilitating the unmoulding of hydraulic bonding material comprises as the oil component an ester of a hindered polyhydric alcohol having no hydrogen atoms attached to any carbon atom in a beta-position to any hydroxyl group and a straight or branched chain, saturated or unsaturated C4-C24 monocarboxylic acid. The ester may be partial and the partial ester may he alkoxylated. In a preferred embodiment also a straight or branched chain, saturated or unsaturated C8-C24 monohydric alcohol is present. Also a method of unmoulding has been described.
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 March 18, 1993 and granted May 19, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 18, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 18, 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.
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.