Coating composition for optical plastic moldings
CA 2071692 C · Owner: Itoh Optical Industrial Co. Ltd. · Inventors: Honda, Mutsuyo; Kato, Hirohisa; Murai, Sachio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coating composition that can be applied to optical plastic moldings having a high refractive index to, protect them from deterioration by light without any adverse effect on their optical functions. The coating composition contains the following essential constituents. (A) 1 part of a hydrolyzate of a silane compound; (B) 0.2-5 parts of titanium oxide-based composite fine particles having a particle diameter of 1-100 nm in which titanium oxide integrally combines with iron oxide, with the ratio of iron oxide to titanium oxide being 0.005-0.15 by weight;, (C) 0.02-0.5 part of an unsaturated or saturated polycarboxylic acid or an anhydride thereof; and (D) 0.01-0.2 part of a heat-curing …
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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 June 19, 1992 and granted March 9, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 19, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 19, 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
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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.