Patents by Inventor Gary Brett Lewis

Gary Brett Lewis 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).

  • Air gage spinning process
    Patent number: 4078034
    Abstract: The strength of aromatic polyamide filaments spun at high speed downwardly through a non-coagulating fluid into a liquid coagulating bath and subsequently through a spin tube containing the freshly spun filaments and coagulating liquid is improved when the filaments are abruptly deflected away from the walls of the spin tube a distance of 0.025 to 0.15 times the inside diameter of the spin tube.
    Type: Grant
    Filed: December 21, 1976
    Date of Patent: March 7, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Gary Brett Lewis
  • Improved yarn extraction process
    Patent number: 4070431
    Abstract: The salt content of neutralized aromatic polyamide fibers spun from an acid solution downwardly into a spin tube containing the fibers and a coagulating liquid is reduced when a gas is injected into the spin tube 0.25 to 20 cm. downstream from the entrance of the spin tube.
    Type: Grant
    Filed: December 21, 1976
    Date of Patent: January 24, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Gary Brett Lewis, Stephen Donald Moore