Cast resin lenses
CA 1135464 A · Owner: Laliberte, Norman U. · Inventors: Laliberte, Norman U.; Rotenberg, Don H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The method of making a post-cured cast resin lens comprising the steps of: casting an allyl diglycol carbonate resin in a mold to the shape desired of the lens; partially curing the resin in the mold to produce a lens body; removing the partially cured lens body from the mold; coating the partially cured lens body with a readily removable material which is impervious to oxygen; exposing the coated lens body to a post-curing temperature above room temperature until substantially complete polymerization of all portions and surfaces of the lens body beneath the coating takes place; and removing the coating for exposure and use of the post-cured lens which features high surface cure and …
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
- Granted November 16, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 16, 1999.
- 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.