Anionic surfactant addition products of maleic or fumaric acid and a poly(ethoxylated) alcohol
CA 1339939 C · Owner: Weaver, Otha G,. Jr. · Inventors: Weaver, Otha G,. Jr.; Hemling, Thomas C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing anionic surfactants is disclosed; and, more specifically, surfactants which exhibit excellent sequestering efficacy for metal ions. These surfactants are prepared by the addition reaction of maleic or fumaric acid with a poly(ethoxylated) alcohol which is a relatively fast reaction as compared to certain of the analogous reactions using poly(ethoxylated-propoxylated) alcohols of the prior art. The surfactants of the present invention are physically and chemically stable in aqueous alkali media.
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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 July 7, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 7, 2015.
- 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.