Process for the production of lenses with a variable refraction index
CA 2109936 A1 · Owner: Maier, Gerhard · Inventors: Fujimoto, Masahiro; Maier, Gerhard; Harrison, David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
2109936 9222846 PCTABScor01, This invention presents a process for the production of a lens with a given variable refraction index by fixing together several parts, at least some of them have a variable refraction index. The realization of the desired refraction index of the parts can be achieved by compressing dielectric material of a first shape into its final shape or by a doping or a mixing process respectively. Outer parts which extend to the outer surface of the lens to be produced, have a pyramid-like shape with a pointed or truncated apex respectively. In the first case the apexes of the outer parts meet in the symmetry point of said lens; in the latter case a center part is used …
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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 25, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 25, 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.