Glass coated polysiloxane contact lens
CA 1107233 A · Owner: Bausch & Lomb Incorporated · Inventors: Su, Kai C.; Letter, Eugene C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A glass coated flexible, hydrophilic polymeric contact lens having a sufficient amount Or oxygen transportability to meet the requirements of the human cornea is disclosed. In addition, this glass coated contact lens is wettable fillerless, hydrolytically stable, biologically inert transparent, resilient and sort. The glass coating is substantially colorless transparent and from about 100 to about 8,000 angstroms thick. 'he glass may be a silicate glass a phosphate Glass or a germanate, glass or mixtures thereof. The contact lens substrate comprises polymer comprising a poly(organosiloxane) terminally bonded through a divalent hydrocarbon group to a polymerized activated unsaturated group. …
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 August 18, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 18, 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.