Expired Canadian patentCanada
Ophthalmic compositions containing a synergistic combination of two polymers
CA 2839847 C · Owner: Alcon, Inc. · Inventors: Chowhan, Masood A.; Chen, Huagang
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ophthalmic compositions suitable for use as artificial tears or as vehicles for,ophthalmic drugs are disclosed. The compositions contain a combination of two polymers that have a synergistic effect on viscosity.
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 6, 2004 and granted March 15, 2016. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 6, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2026.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 6, 2004
GrantedMarch 15, 2016
Term endedJune 6, 2024
Patent numberCA 2839847 C
Classification (IPC)A61K31/76 +2 more
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.