Soft contact lens
CA 1214899 A · Owner: Hoya Lens Corporation · Inventors: Yokoyama, Yuichi; Tsuchiya, Makoto; Kadoma, Yoshinori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A soft lens is obtained from a composition comprising, in specified amounts, a monomethacrylate of an alkylene glycol, a fluorine-containing methacrylate preferably tri-, fluoroethyl methacrylate and/or hexafluoroisopropyl methacrylate, and one or more compounds selected from unsaturated carboxylic acids, monomethacrylates of polyhydric alcohols with three or more hydroxyl groups and alkyl methacrylates. The resulting soft contact lens has the same optical properties and elasticity as conventional soft contact lenses and, is very superior to the conventional ones in resistance to deposit and in shape stability.
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 December 2, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 2, 2003.
- 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.