Expired Canadian patentCanada
An optical film, an antireflection film, a reflection film, a method for forming the optical film, the antireflection film or the reflection film and an optical device
CA 2128743 C · Owner: Miura, Shuichi · Inventors: Okada, Nobumasa; Miura, Shuichi; Ohsaka, Shigeo
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical film of the present invention is of multi-layered structure which has a high-refractive-index layer composed of titanium oxidic nitride aluminum, oxidic nitride, or silicon oxidic nitride.
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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 July 25, 1994 and granted April 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 25, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 25, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 25, 1994
GrantedApril 11, 2000
Term endedJuly 25, 2014
Patent numberCA 2128743 C
Classification (IPC)G02B1/11 +2 more
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.