Patents by Inventor Jan Erik Sandgren

Jan Erik Sandgren 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 and apparatus for manufacturing slide fastener stringer with improved fastening element count
    Patent number: 3987533
    Abstract: In the manufacture of a slide fastener stringer, the relative count of fastening elements per unit length of the tape of the stringer being manufactured is continuously monitored and used as a feedback control to adjust the relative rate of advancement of either a train of fastening elements or a stringer-tape-forming member.
    Type: Grant
    Filed: October 20, 1975
    Date of Patent: October 26, 1976
    Assignee: Textron, Inc.
    Inventor: Jan Erik Sandgren