Patents by Inventor Lothar Rupprecht

Lothar Rupprecht 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).

  • Method for producing textured filament yarns with improved yarn qualities from preorientated polyamide 6
    Patent number: 4103480
    Abstract: The invention is related to a method for producing texturized yarns from polyamide 6 which have small parts of a transitional structure in the .alpha.-modification in addition to the predominant .alpha.-modification, using a rapidly spun yarn in the .alpha.-modification, wherein a yarn with an elongation of 40 to 100% and a density of 1.130 to 1.140 is texturized at texturizing speeds of from 4000 to 1600 m/min at a temperature of from 170.degree. to 220.degree. C while maintaining a constant thread tension ratio of twister outlet to twister inlet of from 1 : 1.0 to 1 : 1.5 by means of a frictional twister while simultaneously stretching in a ratio of from 1 : 1.05 to 1 : 1.5.
    Type: Grant
    Filed: March 10, 1977
    Date of Patent: August 1, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Rellensmann, Michael Bueb, Lothar Rupprecht, Herbert Schmidt, Wolfram Wagner