Patents by Inventor Stephan C. De La Veaux

Stephan C. De La Veaux 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 the recovery of chlorine from iron chlorides
    Patent number: 6277354
    Abstract: The present invention provides a process for recovering the chlorine value from a particulate feed stream of metal chlorides wherein the total energy and reactant mass flow are managed to minimize the build up of deposits of solids on the reactor walls and maximize the conversion of the metal chlorides to metal oxides and chlorine.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: August 21, 2001
    Assignee: E. I. duPont de Nemours and Company
    Inventors: Aaron J. Becker, Stephan C. De La Veaux, James B. Dunson, Jr., Hans Hellmut Glaeser, Suhas Mahuli, Gary Ken Whiting
  • Method and apparatus for producing para-aramid pulp and pulp produced thereby
    Patent number: 5202184
    Abstract: A method for producing para-aramid pulp includes forming a liquid, actively-polymerizing solution and subjecting the solution to orienting flow which produces an optically anisotropic liquid solution with polymer chains oriented in the direction of the flow. When the solution has a viscosity sufficient to maintain the orientation of the polymer chains, the solution is incubated until it gels. The gel is cut transversely at intervals and para-aramid pulp is isolated from the gel. Para-aramid pulp produced by the process can be used similarly to pulp produced from spun fiber.
    Type: Grant
    Filed: July 1, 1991
    Date of Patent: April 13, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Roland T. Brierre, Stephan C. De La Veaux, James E. Geary, Jr., Wesley Memeger, Jr., Michael L. Trancynger
  • Method for producing para-aramid pulp
    Patent number: 5028372
    Abstract: A method for producing para-aramid pulp includes forming a liquid, actively-polymerizing solution and subjecting the solution to orienting flow which produces an optically anisotropic liquid solution with polymer chains oriented in the direction of the flow. When the solution has a viscosity sufficient to maintain the orientation of the polymer chains, the solution is incubated until it gels. The gel is cut transversely at intervals and para-aramid pulp is isolated from the gel. Para-aramid pulp produced by the process can be used similarly to pulp produced from spun fiber.
    Type: Grant
    Filed: June 5, 1989
    Date of Patent: July 2, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Roland T. Brierre, Stephan C. De La Veaux, James E. Geary, Jr., Wesley Memeger, Jr., Michael L. Trancynger
  • High modulus poly-p-phenylene terephthalamide fiber
    Patent number: 5001219
    Abstract: High modulus, high tenacity fibers of poly-p-phenylene terephthalamide (PPD-T) are disclosed along with a fiber heat treating process for increasing the inherent viscosity and the crystallinity index of the PPD-T. Never-dried fibers swollen with water of controlled acidity are heated beyond dryness.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: March 19, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Terry S. Chern, Stephan C. De La Veaux, Jacob Lahijani, James E. Van Trump
  • Process for manufacturing a high modulus poly-p-phenylene terephthalamide fiber
    Patent number: 4883634
    Abstract: High modulus, high tenacity fibers of poly-p-phenylene terephthalamide (PPD-T) are manufactured comprising a fiber heat treating process for increasing the inherent viscosity and the crystallinity index of the PPD-T. Never-dried fibers swollen with water of controlled acidity are heated beyond dryness in an atmoshphere having a flow of greater than Reynolds Number 10,000 throughout the duration of the heating.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: November 28, 1989
    Assignee: E. I. DU Pont De Nemours and Company
    Inventors: Terry S. Chern, Stephan C. De La Veaux, Jacob Lahijani, James E. Van Trump