Patents by Inventor Ralf Tatas

Ralf Tatas 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).

  • Process for deploymerizing polysulfides and the preparation of bis-mercapto-diethers
    Patent number: 9193679
    Abstract: The invention related to a process for the preparation of a bismercaptodiether by reacting a polysulfide with a monothiol in the presence of a base and to a process for the depolymerization of a polysulfide by reacting said polysulfide with a monothiol in the presence of a base. These processes enable the preparation of bismercaptodiethers without inorganic salt formation.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: November 24, 2015
    Assignee: AKZO NOBEL CHEMICALS INTERNATIONAL B.V.
    Inventors: Rudolf Anthonius Maria Venderbosch, Hendrika Petronella Maria Verlaan-Hooft, Auke Gerardus Talma, Olaf Klobes, Ralf Tatas, Hendrik Jan Vos
  • Process for Depolymerizing Polysulfides and the Preparation of Bis-Mercapto-Diethers
    Publication number: 20150183733
    Abstract: The invention related to a process for the preparation of a bismercaptodiether by reacting a polysulfide with a monothiol in the presence of a base and to a process for the depolymerization of a polysulfide by reacting said polysulfide with a monothiol in the presence of a base. These processes enable the preparation of bismercaptodiethers without inorganic salt formation.
    Type: Application
    Filed: March 11, 2015
    Publication date: July 2, 2015
    Applicant: AKZO NOBEL CHEMICALS INTERNATIONAL B.V.
    Inventors: Rudolf Anthonius Maria Venderbosch, Hendrika Petronella Maria Verlaan-Hooft, Auke Gerardus Talma, Olaf Klobes, Ralf Tatas, Hendrik Jan Vos
  • Process for depolymerizing polysulfides and the preparation of bis-mercapto-diethers
    Patent number: 9006492
    Abstract: The invention related to a process for the preparation of a bismercaptodiether by reacting a polysulfide with a monothiol in the presence of a base and to a process for the depolymerization of a polysulfide by reacting said polysulfide with a monothiol in the presence of a base. These processes enable the preparation of bismercaptodiethers without inorganic salt formation.
    Type: Grant
    Filed: March 14, 2011
    Date of Patent: April 14, 2015
    Assignee: Akzo Nobel Chemicals International B.V.
    Inventors: Rudolf Anthonius Maria Venderbosch, Hendrika Petronella Maria Verlaan-Hooft, Auke Gerardus Talma, Olaf Klobes, Ralf Tatas, Hendrik Jan Vos
  • Process for Depolymerizing Polysulfides and the Preparation of Bis-Mercapto-Diethers
    Publication number: 20130041183
    Abstract: The invention related to a process for the preparation of a bismercaptodiether by reacting a polysulfide with a monothiol in the presence of a base and to a process for the depolymerization of a polysulfide by reacting said polysulfide with a monothiol in the presence of a base. These processes enable the preparation of bismercaptodiethers without inorganic salt formation.
    Type: Application
    Filed: March 14, 2011
    Publication date: February 14, 2013
    Applicant: AKZO NOBEL CHEMICALS INTERNATIONAL B.V.
    Inventors: Rudolf Anthonius Maria Venderbosch, Hendrika Petronella Maria Verlaan-Hooft, Auke Gerardus Talma, Olaf Klobes, Ralf Tatas, Hendrik Jan Vos
  • Method for coating cellulosic membranes
    Patent number: 5360636
    Abstract: A process for improving the biocompatibility of cellulosic film membranes is characterized by the fact that the film membranes are coated during or after their preparation with cellulose ethers and/or cellulose esters and/or cellulose carbamates whose structures conform to the formulas ##STR1## wherein Cell is the skeleton of the unmodified cellulose molecule without hydroxyl groups; x conforms to the degree of modification, which is in the range of 0.002 to 3; R is an (optionally substituted) alkyl and/or alkenyl and/or aryl and/or arylalkyl group and the carbon chain of the group R contains 1 to 36 carbon atoms and may be interrupted by hetero atoms such as O, S, N, and contains basic and/or acidic groups such as 13 NR'.sub.2, --COOR', and/or --SO.sub.3 R' or their salts, wherein R'=H or R.
    Type: Grant
    Filed: January 5, 1993
    Date of Patent: November 1, 1994
    Assignee: Akzo NV
    Inventors: Michael Diamantoglou, Edmund Richter, Thomas Rintelen, Gustav Duweg, Angelika Reiche, Ralf Tatas