Thiodipropionic acid bisamides as stabilisers for nonblack elastomers
CA 2253985 A1 · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Knobloch, Gerrit; Meier, Hans-Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Nonblack elastomers, which have excellent stability against oxidative light- or ozone-induced, degradation, comprise as stabilisers at least one compound of formula I (see fig. I), wherein, R1 is hydrogen, C1-C12alkyl cyclohexyl, phenyl or benzyl, R2 is hydrogen or C1-C4alkyl and, n is the number 0, 1 or 2. The compounds of formula I are excellently suitable as colour-stable and nonstaining stabilisers and antiozonants for protecting nonblack elastomers against oxidative, thermal, light- or ozone-induced degradation.
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 12, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 12, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 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.