Surfactants derived from dicarboxylic hydroxyacids
CA 1284657 C · Owner: Turchini, Luigi · Inventors: Albanini, Aurelio; Garlisi, Salvatore; Turchini, Luigi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There are described surfactants derived from dicarboxylic hydroxyacids having general formula: (I), wherein: R2 is H or -OH; R, R1, equal to or different from each other, are H, a metallic ion, -NH4 a cation of an, organic base of ammonium or a group having formula: -An - R3 (II), wherein A is a C2-C4 oxyalkylenic group n is a number ranging, from 1 to 20, R3 is a C8-C20 alkyl group wherein at least one of said R, R1 is an -An-R3 group and wherein the group or the -OH groups of the compound having formula (I) can be esterified or etherified by usual methods.
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
- Granted June 4, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 4, 2008.
- 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.