Synergistic stabilizer compositions for polyols and polyurethane foam
CA 2081393 A1 · Owner: R. T. Vanderbilt Company, Inc. · Inventors: Suhoza, Richard A.; Garney, Bruce R.; Lauder, Robert B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polyether polyols and polyurethane foams are stabilized by including therein a liquid stabilizer composition of (a) 2,6-di-tert-butyl-4-secbutylphenol, (b) a reaction product of diisobutylene styrene and diphen-, ylamine and (c) phenothiazine or C9-26-alkyl substituted phenothiazine and wherein the ratio of the phenol to the reaction product is about 1:5 to 5:1 and the ratio of the mixture of components (a) and (b) to the phenothiazine compound is ahout 5.0 : 0.1 to 4.0 : 1Ø The stabilizer composition may further contain trihydrocarbyl phosphite to stabilize the color of same.
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 October 26, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 26, 2014.
- 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.