Ophthalmic solution for artificial tears
CA 2125060 C · Owner: Dabrowski, Henry P. · Inventors: Lever, O. William Jr.; Salpekar, Anil; Dabrowski, Henry P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An ophthalmic artificial tear solution is described for treating irritation and dryness of the eyes with a formulation that includes, polyvinylpyrrolidone a preservative such as, benzalkonium chloride glycerin and hydroxypropyl, methylcellulose wherein the composition is an, aqueous solution having isotonic properties with respect to the eye. The ophthalmic solution of the invention is characterized as having a low viscosity, preferably less than 5 cps, and a low surface tension, preferably less than 40 dynes/cm wherein wettability, retainability and comfort of the user are enhanced.
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 June 2, 1994 and granted March 30, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 2, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 2, 2016.
- 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.