Foam control agents for silicone surfactants in agriculture
CA 2198059 C · Owner: Murphy, Gerald J. · Inventors: Policello, George A.; Murphy, Gerald J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention teaches silicone polyether copolymers with a low degree of polymerization (3 to 4 Si units) provide control for foams generated by organosilicone based surfactants in water without the need for an additional antifoam component. The copolymer foam control agent is a compound of the formula (CH3)3SiOSiO(CH3)1xSiOCH3R1ySi(CH)3, wherein X + Y = 1 to 2 Y ~ 1, R1 is an alkyleneoxide group of the formula CaH2aO(C3H6O)zR2 wherein a = 3 to 4, z is 1 to 15, R2 is hydrogen a hydrocarbon radical of 1 to 4 carbons or acetyl. This invention provides compositions for use in agricultural formulations that give improved foam control for foams generated from organosilicone surfactants …
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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 February 20, 1997 and granted May 13, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 20, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 2019.
- 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.