Refractive index distribution lens, method for manufacturing refractive index distribution lens, and lens array
CA 2364204 A1 · Owner: Nippon Sheet Glass Co. Ltd. · Inventors: Taniguchi, Satoshi; Ishikawa, Masatake; Koshi, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compact refractive index distribution lens that can be manufactured without decreasing the amount of incident light. The refractive index distribution lens includes a lens body radially distributing refractive indexes. The lens body has a cross sectional outline formed by removing at least part of a peripheral portion of an original lens body.
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 December 3, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 3, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2023.
- 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.