Patents by Inventor Spencer B. T. Lin

Spencer B. T. Lin 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).

  • Polypropylene endless loop and the method therefor
    Patent number: 4286429
    Abstract: A method is disclosed for preparing polypropylene endless loop by blow-moulding polypropylene raw materials into tubular sheet, drawing the same transversely to an extent to provide a draw ratio of at least 4, and before or after the drawing step, cutting the tubular sheet to form individual endless loops, then twisting the cut and drawer loops to provide a twisted endless loop. The preferred polypropylene endless loop product is also disclosed.
    Type: Grant
    Filed: September 25, 1979
    Date of Patent: September 1, 1981
    Inventor: Spencer B. T. Lin
  • Plastic bag
    Patent number: D246510
    Type: Grant
    Filed: October 20, 1975
    Date of Patent: November 29, 1977
    Inventor: Spencer B. T. Lin