Cement composition and a process for preparation thereof
CA 1278583 C · Owner: Endoh, Shyuzo · Inventors: Endoh, Shyuzo; Sakuta, Masaharu; Urano, Toshiharu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The disclosure describes a hydraulic cement composition comprising a carbonation inhibitor for the cement composition. This inhibitor is a compound of the general formula (I):, A?XmYn-H)? (I), wherein A is a polyamine residue containing 2-10 carbon atoms, X is -CH2CH2O-, Y is -C3H6O- ? is a number equal to 1-8, m is a number equal to 0-3, n is a number equal to 0-4, the product m x ? is equal to 0-16, the product n x ? is equal to 0-20, (m x ? + n x ? ) is equal to 1-20 and X and Y are arranged in an optional order, each -XmYn-H moiety thus being a residue of an ethylene oxide or propylene oxide-derived addend or an ethylene oxide or propylene oxide homopolymer or ethylene oxide-propylene …
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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 January 2, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 2, 2008.
- 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
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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.