Improved ophthalmic and contact lens solutions containing simple saccharides as preservative enhancers
CA 2428985 C · Owner: Smith, Francis Xavier · Inventors: Smith, Francis Xavier
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A contact lens solution comprising 0.0001 to 10 weight percent or a preservative enhancer chosen from the group consisting of: inositol; mannitol; sorbitol; sucrose; dextrose; glycerin and propylene glycol; and at least 0.0001 weight percent of a cationic polymeric preservative and where the , concentration of chloride in said solution is less than 0.2 percent by weight.
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 November 8, 2001 and granted May 24, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 8, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 8, 2023.
- 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.