Method for manufacturing layer-built material with silicon dioxide film containing organic colorant and the layer-built material manufactured thereby
CA 2013660 C · Owner: Takemura, Kazuo · Inventors: Kawahara, Hideo; Takemura, Kazuo; Kitaoka, Masaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for forming a silicon dioxide film according to the present invention comprises steps of: (i) contacting a substrate with processing solution containing silicofluoric acid solution supersaturated with silicon dioxide, and (ii) forming the silicon dioxide film on the substrate; wherein organic colorants) is/are introduced into the silicon dioxide film by adding organic colorants) to the processing solution. According to the present invention a silicon, dioxide film containing organic colorant without defect such as air bubbles, or undecomposed raw material.
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 April 2, 1990 and granted June 13, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 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.