Patents by Inventor Walter C. Berry, Jr.

Walter C. Berry, Jr. 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).

  • Dry spinning process with a gas flow amplifier
    Patent number: 4402900
    Abstract: In conventional dry-spinning processes forming a hollow bundle of filaments, a heated inert gas is introduced to evaporate spinning solvent from the filaments, and a vacuum may be applied in the center of the bundle near the face of the spinneret to assist in drawing the heated inert gas through the filament bundle. A Coanda-flow entrainment device in the center of the bundle adjacent the spinneret face uses a small inlet gas flow directed along a Coanda surface. The device entrains gas, pulling it through the filament bundle and then directing it downward. This entrained flow can supplement or supplant the vacuum-induced flow through the filaments.
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: September 6, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Walter C. Berry, Jr.