Contact lens for the eye of a patient with keratoconus disease and method of making the same
CA 1259833 A · Owner: Siviglia, Nick · Inventors: Siviglia, Nick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A contact lens (10) for the eye (22) of a patient with a keratoconus diseased cornea (24) has a posterior surface (13) comprised of three zones (12, 14, 16), each having a different radius of curvature. The innermost or first zone (12) has a diameter slightly greater than the diameter of the diseased area (26) of the cornea (24) and has a radius of curvature which generally corresponds to but is slightly greater than the outward protrusion of the diseased cornea area (26). The second zone (14) is generally annular and extends radially beyond the first zone (12). The second zone (14) has a radius of curvature which is flatter than that of the first zone (12). The third zone (16) which is …
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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
- Granted September 26, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 26, 2006.
- 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.