Patents Assigned to Dequest AG
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Patent number: 8758556Abstract: A method for inhibiting the formation, deposition and adherence of calcium salt scale to metallic and other surfaces in the equipment, vessels and/or piping of a chemical pulp process facility comprising adding an effective scale inhibiting amount of a composition to the alkaline aqueous mixture in the digester of said chemical pulping process. Said composition consists of at least one phosphonate component (I) and at least one component (II) consisting of at least one carboxylated fructan compound.Type: GrantFiled: March 16, 2010Date of Patent: June 24, 2014Assignee: Dequest AGInventor: Sheldon Phillip Verrett
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Patent number: 8551931Abstract: Surface treatment compositions containing selected phosphonic acid compounds are disclosed. The compositions contain major levels of surface-active agents in combination with additive levels of the phosphonic acid compounds, and, in accordance with needs and objectives, conventional optional ingredients and additive agents. The inventive compositions can provide significant performance benefits, among others novel synergies and eminently desirable regulatory and environmental acceptability.Type: GrantFiled: January 21, 2009Date of Patent: October 8, 2013Assignee: Dequest AGInventors: Patrick Notte, Albert Devaux, Luc Feyt
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Patent number: 8505626Abstract: Novel aminoacid alkylphosphonic acid compounds are disclosed. These compounds can be used in multiple applications, in particular in a scale inhibitor functionality in aqueous systems, including in marine oil recovery.Type: GrantFiled: May 25, 2007Date of Patent: August 13, 2013Assignee: Dequest AGInventors: Patrick Notte, Albert Devaux
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Patent number: 8461088Abstract: A method is disclosed to inhibit scale formation in aqueous systems whereby a threshold amount of a scale inhibiting agent, represented by an aminoacid alkylphosphonic acid, is added to the aqueous system. The aminoacid moiety can be represented by ?-species or by species having, at least, two or more carbon atoms between the carboxylic moiety and the amine group. These aminoacid based inhibitors exhibit unusually superior performance and system acceptability compared to leading state-of-the-art inhibitors.Type: GrantFiled: May 25, 2007Date of Patent: June 11, 2013Assignee: Dequest AGInventors: Patrick P. B Notte, Albert Devaux, Jan Van Bree, Tessa Johnson
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Publication number: 20130085094Abstract: The invention relates to a cleaning composition with improved stain removal. The alkaline composition contains a hydrolysable dispersing polymer which is selected from carboxylated fructans and one or more biodegradable aminocarboxylate chelating agents.Type: ApplicationFiled: May 19, 2011Publication date: April 4, 2013Applicant: DEQUEST AGInventors: Isabelle Leonard, Valerie Kochowski, Genevieve Bonnechere-Delstanche, Olivier Henry
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Publication number: 20130042986Abstract: A process for pulp bleaching is disclosed wherein an amino acid phosphonic acid is used together with a bleaching agent, pH regulants and pH buffers for pulp treatment in an aqueous medium. The bleaching agent can be represented by oxidative and reductive bleaching agents. The oxidative bleach treatment is conducted in alkaline medium whereas the reductive treatment is conducted in mildly acid medium.Type: ApplicationFiled: February 14, 2011Publication date: February 21, 2013Applicant: DEQUEST AGInventors: Thierry Jules Guilmin, Patrick Notté
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Patent number: 8349772Abstract: A method of secondary oil recovery is disclosed wherein from 0.1 to 100 000 ppm of a medium soluble aminoalkylene phosphonic acid amine salt are used wherein both the aminoalkylene phosphonic acid moiety and the amine moiety are selected from a specifically defined class of compounds. The substantially medium soluble aminoalkylene amine phosphonates exhibit a significantly improved compatibility with the recovery medium and thus can propagate fairly freely into the medium and consequently cover a largely extended rock surface before being subject to precipitation in the form of a medium insoluble scale inhibitor. The amine compound is represented by combinations of structurally different compounds.Type: GrantFiled: July 1, 2009Date of Patent: January 8, 2013Assignee: Dequest AGInventors: Patrick Notté, Albert Devaux
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Publication number: 20110133116Abstract: A method for securing the use of an aqueous medium under any substantial exclusion of metal ion interference is disclosed. A phosphonic acid compound containing: a selected phosphonate moiety and a moiety selected from a limited number of species; or hydrocarbon chains containing aminoalkylene phosphonic acid substituents; or alkylamino alkylene phosphonic acids containing an active moiety embodying N, O, and S. The technology can, by way of illustration, be used in numerous applications including secondary oil recovery, scale inhibition, industrial water treatment, paper pulp bleaching, dispersant treatment, sequestering application, brightness reversion avoidance and paper pulp treatment.Type: ApplicationFiled: January 21, 2009Publication date: June 9, 2011Applicant: DEQUEST AGInventors: Patrick Notte, Tessa Johnson, Albert Devaux
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Publication number: 20110130312Abstract: A method of secondary oil recovery is disclosed wherein from 0.1 to 100 000 ppm of a medium soluble aminoalkylene phosphonic acid amine salt are used wherein both the aminoalkylene phosphonic acid moiety and the amine moiety are selected from a specifically defined class of compounds. The substantially medium soluble aminoalkylene amine phosphonates exhibit a significantly improved compatibility with the recovery medium and thus can propagate fairly freely into the medium and consequently cover a largely extended rock surface before being subject to precipitation in the form of a medium insoluble scale inhibitor. The amine compound is represented by combinations of structurally different compounds.Type: ApplicationFiled: January 7, 2009Publication date: June 2, 2011Applicant: DEQUEST AGInventors: Patrick Notté, Albert Devaux
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Publication number: 20110086791Abstract: Surface treatment compositions containing selected phosphonic acid compounds are disclosed. The compositions contain major levels of surface-active agents in combination with additive levels of the phosphonic acid compounds, and, in accordance with needs and objectives, conventional optional ingredients and additive agents. The inventive compositions can provide significant performance benefits, among others novel synergies and eminently desirable regulatory and environmental acceptability.Type: ApplicationFiled: January 21, 2009Publication date: April 14, 2011Applicant: DEQUEST AGInventors: Patrick Notte, Albert Devaux, Luc Feyt