Ophthalmic suspensions
CA 2086121 C · Owner: Insite Vision Incorporated · Inventors: Robinson, Joseph R.; Archibald, Roy D.; Davis, Jeffery P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Lightly crosslinked polymers; preferably ones prepared by suspension or emulsion polymerizing at least about 90 % by weight of a carboxyl-containing monoethylenically unsaturated monomer such as acrylic acid with from about 0.1 % to about 5 % by weight of a polyfunctional, and preferably difunctional crosslinking agent , such as divinyl glycol having a particle size of not more than about 50 µm in equivalent spherical diameter when formulated , with an ophthalmic medicament into suspension in, aqueous medium in which the amount of polymer ranges from about 0:1 % to about 6.5 % by weight, based on the total weight of the aqueous suspension, the pH is from about 3.0 to about 6.5 and the …
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 25, 1991 and granted November 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2013.
- 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.