Wide field spherical lenses and protective eyewear
CA 2425157 A1 · Owner: Perrott, Colin Maurice · Inventors: Yip, Brandon; Adams, Brian; Perrott, Colin Maurice
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to novel ophthalmic lens elements (402 404) and , eyewear (400) having wide field of view low distortion, improved astigmatism , correction where required and enhanced eye protection properties. Series of lens elements have steeply curved spherical reference surfaces. The edged lenses of the series have approximately consistent aperture size shape and , hollow depth across a range of common prescriptions. Novel sunglasses laser , protection eyewear, and lens edgings coatings, and frames are included in the invention.
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 October 30, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 30, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 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.