Ophthalmic compositions and methods for preserving and using same
CA 2070293 C · Owner: Wong, Michelle P. · Inventors: Wong, Michelle P.; Dziabo, Anthony J. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ophthalmic compositions, such as those used to care for contact lenses methods of preserving such compositions and, methods for disinfecting contact lenses using such compositions are disclosed. The compositions may comprise an ophthalmically acceptable, liquid aqueous medium and included therein, an effective , preserving or disinfecting amount of an ophthalmically acceptable quaternary ammonium substituted matrix material the matrix , material being selected from the group consisting of proteinaceous materials, carbohydrate materials and mixtures thereof.
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
- Filed December 18, 1990 and granted August 14, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 2012.
- 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.