Method and composition for rewetting contact lenses and relieving eye dryness
CA 2266599 C · Owner: Bausch & Lomb Incorporated · Inventors: Sanzgiri, Yeshwant; De, Nimai C.; Moran, Irene
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a lubricant for contact lenses or dry eye or to provide relief from eye irritation. In particular the composition , contains a biguanide preservative in combination with polyvinylpyrrollidone. An ophthalmic solution containing such a combination of components can be applied, in the form of droplets, to the eye or to contact lens in the eye. In one embodiment of the invention, the composition is used as a universal lubricant, meaning that the same solution can be used with or without contact lenses, depending on the needs of the user whether in the context of a , contact-lens care or general eye care.
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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 August 21, 1997 and granted March 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 21, 2019.
- 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.