Patents by Inventor Laura Crowther-Alwyn

Laura Crowther-Alwyn has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20190202189
    Abstract: A method for fixing a first surface to a second surface. The method comprises depositing a first layer of nanocellulose on the first surface; bringing the first layer of nanocellulose into contact with the second surface or with a second layer of nanocellulose deposited on the second surface; and fixing the first layer of nanocellulose to the second surface, the second surface containing cellulose, or to the second layer of nanocellulose by a step of ultrasonic welding, which results in a first zone comprising the first layer of nanocellulose, where the first surface is fixed to the second surface, and a second zone around the first zone, where the first surface is not fixed to the second surface.
    Type: Application
    Filed: June 1, 2017
    Publication date: July 4, 2019
    Inventors: Julien BRAS, Didier IMBAULT, Barthélémy HARTHONG, Robert PEYROUX, Arnaud REGAZZI, Laura CROWTHER-ALWYN, David GUERIN, Jérémie VIGUIE
  • Patent number: 10131741
    Abstract: The present invention relates to an alkyd resin as well as to a method for preparing such a resin, said alkyd resin resulting from the polycondensation: of at least one polyacid, preferably biosourced, or its acid anhydride preferably biosourced, of at least one component based on oil, preferably biosourced, or its corresponding fatty acid, preferably biosourced, of at least one polyol, preferably biosourced, having at least two hydroxyl groups, selected from polyols comprising at least one 1,4:3,6-dianhydrohexitol unit, of rosin or of at least one of its derivatives, wherein at least one polyacid is succinic acid, preferably biosourced, or its anhydride, preferably biosourced; and wherein the percentage by dry weight of rosin or its derivatives based on the total dry weight of succinic acid and of its anhydride and of rosin or its derivatives is comprised between about 10% and about 80%.
    Type: Grant
    Filed: August 5, 2014
    Date of Patent: November 20, 2018
    Assignees: A Et A Mader, Roquette Freres
    Inventors: Cyril Barquant, Joël Roussel, Clothilde Buffe, Laura Crowther-Alwyn
  • Patent number: 9790111
    Abstract: Disclosed is a method for thickening or dehydrating sludge, which includes at least: a) a step of adding flocculants to the sludge to be treated; b) a step of flocculation by agitation of the sludge with the flocculants thus added in order to form a mixture of flocks and an aqueous solution; c) a step of mechanical separation of the flocks and the aqueous solution formed during the preceding step; d) a step of recovering the aqueous solution and the flocks that make up a treated sludge; wherein: the added flocculants are made up of at least one cationic starch (S) and at least one cationic polyacrylamide (P); the cationic starch or starches (S) including a fixed weight percentage of nitrogen of at least 2%; and the weight ratio (R) ws/(ws+wp), expressed as solids, is included between 0.6 and 0.99.
    Type: Grant
    Filed: November 28, 2013
    Date of Patent: October 17, 2017
    Assignee: Roquette Freres
    Inventors: Laura Crowther-Alwyn, Medhi Carre, Michel Simon
  • Publication number: 20160168318
    Abstract: The present invention relates to an alkyd resin as well as to a method for preparing such a resin, said alkyd resin resulting from the polycondensation: of at least one polyacid, preferably biosourced, or its acid anhydride preferably biosourced, of at least one component based on oil, preferably biosourced, or its corresponding fatty acid, preferably biosourced, of at least one polyol, preferably biosourced, having at least two hydroxyl groups, selected from polyols comprising at least one 1,4:3,6-dianhydrohexitol unit, of rosin or of at least one of its derivatives, wherein at least one polyacid is succinic acid, preferably biosourced, or its anhydride, preferably biosourced; and wherein the percentage by dry weight of rosin or its derivatives based on the total dry weight of succinic acid and of its anhydride and of rosin or its derivatives is comprised between about 10% and about 80%.
    Type: Application
    Filed: August 5, 2014
    Publication date: June 16, 2016
    Inventors: Cyril BARQUANT, Joël ROUSSEL, Clothilde BUFFE, Laura CROWTHER-ALWYN
  • Patent number: 9321883
    Abstract: The object of a present invention is an alkyd resin as well as the method for preparing such a resin, said alkyd resin comprising: a preferably biosourced, polyacid component or its preferably biosourced acid anhydride; a first polyol component, preferably biosourced, having at least two hydroxyl groups; a second biosourced polyol component having at least one 1,4:3,6-dianhydrohexitol unit; and a component based on biosourced oil or its corresponding biosourced fatty acid.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: April 26, 2016
    Assignees: A ET A MADER, ROQUETTE FRERES
    Inventors: Joël Roussel, Clothilde Buffe, Laura Crowther-Alwyn, Arnaud Verraes
  • Publication number: 20150315056
    Abstract: Disclosed is a method for thickening or dehydrating sludge, which includes at least: a) a step of adding flocculants to the sludge to be treated; b) a step of flocculation by agitation of the sludge with the flocculants thus added in order to form a mixture of flocks and an aqueous solution; c) a step of mechanical separation of the flocks and the aqueous solution formed during the preceding step; d) a step of recovering the aqueous solution and the flocks that make up a treated sludge; wherein: the added flocculants are made up of at least one cationic starch (A) and at least one cationic polyacrylamide (P); the cationic starch or starches (A) including a fixed weight percentage of nitrogen of at least 2%; and the weight ratio (R) mA/(mA+mP), expressed as solids, is included between 0.6 and 0.99.
    Type: Application
    Filed: November 28, 2013
    Publication date: November 5, 2015
    Inventors: Laura CROWTHER-ALWYN, Medhi CARRE, Michel SIMON
  • Publication number: 20150307377
    Abstract: A process for making an aqueous solution containing solids in suspension drinkable, includes a coagulation-flocculation step, which includes the steps of: a) adding coagulants to the aqueous solution to be treated; b) stirring the aqueous solution to which coagulants were thus added; c) separating the coagulated solids by settling out or flotation; d) recovering purified water; wherein the coagulants added in step a) include metal salts chosen from ferric salts and aluminum salts, and also a liquid starchy composition including a cationic waxy starch, the cationic starch having, when it is placed in the form of an aqueous composition, a viscosity, measured according to a test A, greater than 100 mPa·s and less than 1000 mPa·s, this test A consisting in adjusting the dry weight of cationic waxy starch of the aqueous composition to 10% and then measuring the Brookfield viscosity at 25° C. of the resulting composition.
    Type: Application
    Filed: November 18, 2013
    Publication date: October 29, 2015
    Inventors: Laura CROWTHER-ALWYN, Anne-Chantal HERRENG, Celine POTTIER, Regis HOUZE
  • Publication number: 20150031828
    Abstract: The object of a present invention is an alkyd resin as well as the method for preparing such a resin, said alkyd resin comprising: a preferably biosourced, polyacid component or its preferably biosourced acid anhydride; a first polyol component, preferably biosourced, having at least two hydroxyl groups; a second biosourced polyol component having at least one 1,4:3,6-dianhydrohexitol unit; and a component based on biosourced oil or its corresponding biosourced fatty acid.
    Type: Application
    Filed: February 1, 2013
    Publication date: January 29, 2015
    Inventors: Joël Roussel, Clothilde Buffe, Laura Crowther-Alwyn, Arnaud Verraes
  • Publication number: 20140197112
    Abstract: A potabilisation method of a water to be treated, containing a coagulation-flocculation step wherein the step includes: a) a step of adding a liquid composition including a solubilized cationic starch to the aqueous solution to be treated; b) a step of adding one or several metal salts selected from ferric salts and aluminum salts to the aqueous solution to be treated; steps a) and b) being carried out in any order and being carried out either separately, simultaneously or using a liquid composition including both the solubilized cationic starch and the metal salt, the steps a) and b) being followed: c) by a step of stirring the supplemented aqueous solution; d) by a step of separating the coagulated solids by sedimentation or floatation; e) by a step of recovering a purified water; the liquid composition including cationic starch having a viscosity, measured according to test A, higher than 1000 mPa·s.
    Type: Application
    Filed: July 19, 2012
    Publication date: July 17, 2014
    Applicant: ROQUETTE FRERES
    Inventor: Laura Crowther-Alwyn