Dispersant composition for cement
CA 1331633 C · Owner: Tanisho, Yoshiaki · Inventors: Kanzaki, Shoji; Mizunuma, Tatsuya; Tamaki, Ryoichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aqueous dispersant composition for cement comprises 100 parts by weight of a copolymer of an olefin having 2 to 8 carbon atoms and an ethylenically unsaturated dicarboxylic anhydride, the copolymer being in the form of fine particles having an average size of 0.1 to 20 micrometers 15 to 300 parts by, weight, as zinc, of zinc oxide or zinc hydroxide and water the, composition being adjusted to have a pH value of 6 to 12. The composition has a property to prolong the workability of hydraulic cement compositions prepared by mixing water hydraulic cement, sand, gravel and so on. The composition does not lose its property even after being stored for a long period of time.
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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
- Granted August 23, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 23, 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.