Patents by Inventor Alfred Stern

Alfred Stern 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).

  • Wear-resistant flexible sheet material and a method for its manufacture
    Patent number: 4241189
    Abstract: A wear-resistant flexible sheet material, suitable for use as outer soles on footwear, is produced by pressing reconstituted polyurethane foam sheets in the substantial absence of air at temperatures above 150.degree. C. The sheets should have a density exceeding 15 lb/ft.sup.3 and are further densified by the hot pressing. The sheets are preferably pre-heated to 175.degree.-210.degree. C. and pressed under a pressure of 5 to 30 tons/ft.sup.2 for periods of up to 5 minutes. The sheets may be embossed or smooth surfaced and may contain pigments, plasticizers and other additives.
    Type: Grant
    Filed: February 2, 1978
    Date of Patent: December 23, 1980
    Assignee: General Foam Products Limited
    Inventors: Neville M. Sheldon, Alfred Stern