Lens for eyeglasses in which plurality of lenses formed of curved surface are coupled integrally
CA 2106157 A1 · Owner: Cateye Co. Ltd. · Inventors: Iida, Yoshiaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Upper lens formed of a portion of a sphere having radius R2 and lower lens formed of a portion of a sphere having radius R1 are manufactured integrally by molding for forming the lens of eyeglasses Radii R1 and R2 are slightly different from each other, so that the front view comes into eyes through lower lens when the user is in a normal posture, while the front view comes into eyes through upper lens when the user bends forward.
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 September 14, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 14, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 14, 2015.
- 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.