Reinforcing fiber, method for the production thereof, and construction material containing the reinforcing fiber
CA 2090874 C · Owner: Yoshikawa, Kazuo · Inventors: Kashiwagi, Shoji; Kurozumi, Tadatoshi; Yoshikawa, Kazuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A reinforcing fiber having a metal oxide metal, hydroxide, and metal hydroxy-oxide fast deposited thereon useful as a substitute for asbestos, is produced by immersing the fibrous substance in a mixed solution of a metal salt and a solvent. Construction materials having the reinforcing fibers incorporated in inorganic refractory substances are prepared in the form of sheet-molded plates, for example.
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 July 8, 1992 and granted June 3, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 8, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 8, 2014.
- 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.