Cement product and method of producing the same and composition for producing cement product as well as mass concrete and method of producing the same together with cement for producing mass concret
CA 2029068 A1 · Owner: Shimizu Construction Co. Ltd. · Inventors: Suzuki, Nobuo; Tanaka, Isao; Takeshi, Takao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition for producing a sphered cement product which comprises a mixture of a sphered cement aggregate and, water, the sphered cement consisting essentially of cement clinker fine particles the outer peripheral surface of which is sphered by grinding and/or fusion, at least 60wt% of the particles having a diameter of from 3.9 to 30.0 µm. Also disclosed are a sphered cement product obtained from this composition and a method of producing a sphered cement product by curing the above-described mixture.
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 October 31, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 31, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2012.
- 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.