Organopolysiloxanes with dye radicals
CA 2283582 C · Owner: Mahr, Gunter · Inventors: Mahr, Gunter; Deubzer, Bernward; Baumann, Frank
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to organopolysiloxanes whith dye residues containing , units of general formula (I): R1a(RO)bAcR2dSiO(4-a-b-c-d)/2 wherein R R1, R2, A, a, b, d and c have the meaning cited in Claim 1 with the proviso that the , sum of a, b c and d is less than or equal to 3, the organopolysiloxanes have at least one residue A per molecule and that for units of formula (I) where c is different to 0, d equals 0.
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 March 12, 1998 and granted September 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 2020.
- 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.