Process for fitting a contact lens, and measuring lens for performing the process
CA 2234861 A1 · Owner: Wohlk Contact-Linsen Gmbh · Inventors: Rothe, Eckhard; Malchow, Volker; Grimmenstein, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a process for fitting a contact lens to a human eye the geometry of the eyeball and the back surface geometry of the lens, and the required optical corrections for the distant and near vision of the eye to be corrected are determined. The measurement for fitting the contact lens takes place with a measuring lens that enables determination of relative pupil motion with respect to a reference system on or near the eye on changing from far vision to near vision. The measuring lens to be used for this measurement process has a substantially spherical lens body that has a substantially convex outer surface and a substantially concave inner surface. This measuring lens preferably serves for …
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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 8, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 8, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 8, 2020.
- 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.