Mold assembly for forming contact lens blank and method of producing contact lens from the blank
CA 2235692 C · Owner: Yokoyama, Yasuhiro · Inventors: Doke, Atsuhiro; Maruyama, Kunio; Yokoyama, Yasuhiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mold assembly for forming a lens blank which gives a contact lens, the mold assembly comprising an upper and a lower mold half which cooperate with each other to define a substantially fluid-tight mold cavity when the two mold haves are assembled together, the mold cavity being filled with a monomer liquid which is polymerized to provide the lens blank that is to be subjected to a cutting operation for forming a base and a front curved surface of the contact lens, wherein the improvement comprises: the upper mold half including a flexible thin-walled portion which has a downwardly convex shape and which partially defines the mold cavity, the thin-walled portion being deformable to absorb …
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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 19, 1998 and granted August 28, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 19, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 19, 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.