Uv absorbers and light-sensitive organic material containing same
CA 2032671 A1 · Owner: Valet, Andreas · Inventors: Valet, Andreas; Berner, Godwin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A-17885/+, UV Absorbers and light-sensitive organic material containing same Abstract of the Disclosure, A compound of formula wherein R0, R1, R2, R3, R6 and X are as defined in claim 1 are suitable for use as UV, absorbers for protecting light-sensitive organic materials.
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 19, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 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.