Uv absorbers & products containing same
CA 2031167 A1 · Owner: Gupta, Amitava · Inventors: Gupta, Amitava
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to UV absorbers which are benzotriazolyl hydroxy benzophenones and which may be incorporated into plastics materials or polymerised with other monomers such as acrylates or methacrylates. The formed polymers or polymer composition may be employed for the manufacture of articles such as intraocular lens, contact lens and eyeglasses.
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 December 4, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 2012.
- 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.