Rigid gas permeable lenses
CA 2040580 C · Owner: Meyers, William E. · Inventors: Freeman, Michael Harold; Meyers, William E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of fitting rigid gas permeable contact lenses comprising the steps of:, - providing a set of lenses of differing BCOR values but, the same optical corrective power; - fitting a patient with a lens to determine an acceptable BCOR value for the patient;, - determining the corrective prescription for that patient; and, - supplying the patient with a lens having an acceptable BCOR value and the correct prescription. The lens supplied is manufactured in the same geometry and fitting characteristics as the lens from the set used in fitting and adjusted to the correct prescription power from the fixed power by diffractive means.
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 April 16, 1991 and granted January 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 16, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 16, 2013.
- 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.