Patents by Inventor Carl N. Black

Carl N. Black 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).

  • Patent number: 4899678
    Abstract: The present invention permits the testing of the sewing characteristics of various types of sewing threads under conditions which simulate the normal conditions encountered when performing various fabric seaming operations in the conventional manner. The testing of the sewing characteristics of the sewing threads is carried out in an economical manner by using narrow test strip fabric so that the test results can be ascertained in a short period of time. The method and apparatus of the present invention permits various types of sewing threads to be subjected to the identical and repeatable conditions so that an accurate comparison of the sewing characteristics can be made. The sewing thread test can be carried out on relatively inexpensive narrow test fabric strips which are fed to and past the stitching needle of the sewing machine in various angular paths of travel relative to the needle and at preselected variable speed rates.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: February 13, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Frank H. Simons, Carl N. Black