Silicone resin optical devices
CA 1111185 A · Owner: Dow Corning Corporation · Inventors: Polmanteer, Keith E.; Jones, David P.; Fitzgerald, John K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Optical devices such as corneal scleral and interocular, lenses are made from phenyl-containing siloxane resins. They combine a high degree of oxygen transmission with ease of fabrication inherent to hard materials thereby providing, increased wearer comfort and ease of fabrication. A typical resin is a copolymer of phenyl, vinyl and methyl siloxanes having at least about 0.2 phenyl groups per silicon.
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 October 20, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 20, 1998.
- 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.