Polymeric surfactants
CA 1338834 C · Owner: Tomassen, Henricus Paulus Maria · Inventors: Tomassen, Henricus Paulus Maria; De Jong, Bartele Sybren; Stapersma, Johan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Crosslinked, star-shaped polymeric surfactants in particular those having at least two unsaturated moieties in the hydrocarbon chain, one forming a terminal group or a group derived thereof containing a methyl or ethyl group at the terminal carbon atom, whilst the polar group of the surfactant is connected to the last carbon atom at the other end of the hydrocarbon chain. The polymeric surfactants can be prepared by polymerizing a monomeric surfactant as hereinbefore described in a polar solvent wherein, said surfactant is present in a concentration higher than its critical aggregate concentration, at the temperature of polymerization. The crosslinked polymeric surfactants or their …
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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
- Granted January 7, 1997. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 7, 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.