Use of polyglycol ether mixtures as foam inhibitors
CA 2065349 A1 · Owner: Schmid, Karl-Heinz · Inventors: Schenker, Gilbert; Schmid, Karl-Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns the use of polyethyleneglycol ethers of general formula (I): R1O-(CH2CH2O)n-R2 in which R1 is , a branched long-chain alkyl and/or alkenyl residue R2 is an, alkyl residue with 4-8 C-atoms and n is a number which is at least 4, as foam-inhibiting additives in low-foam cleaning agents characterized in that, to optimize both performance and the ease with which commercial concentrates can be prepared from the polyethyleneglycol ethers, mixtures of polyethyleneglycol ethers of general formula (I) are used in which the R1O-residue corresponds to one of the following mixtures of alcohols: a) 10-100 mole % of an equimolar isomeric mixture of 2-hexyldodecanol-1 and …
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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 August 21, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 21, 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
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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.