An electrically conductive cement composition and an electrically conductive mass prepared from the composition
CA 2033100 C · Owner: Sekisui Kagaku Kogyo Kabushiki Kaisha · Inventors: Kishida, Sukemune; Adachi, Toshiyuki; Fukagai, Takayoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrically conductive cement composition is provided. The cement composition comprises portland cement, silica sand, and carbon fibers wherein the, silica sand is contained in an amount of 1 to 90 parts by weight for every 100 parts by weight of the portland cement; and the carbon fibers are contained in an amount of 0.6 to 1.7 parts by weight for every 100 parts by weight of the combined amount of the portland cement and silica sand.
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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 May 18, 1990 and granted February 11, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 18, 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
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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.