Patents by Inventor Theodor A. Liss

Theodor A. Liss 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).

  • Stain resistant polymers & textiles
    Patent number: 4965325
    Abstract: Synthetic polyamide textile substrate having deposited thereon a modified polymeric sulfonated phenol-formaldehyde condensation product comprising one (a) in which 10 to 25% of the polymer units contain SO.sub.3 (-) radicals and about 90 to 75% of the polymer units contain sulfone radicals and (b) in which a portion of the free hydroxyl groups thereof has been acylated or etherified, the number of said hydroxyl groups which has been acylated or etherified being sufficient to inhibit yellowing of said condensation product but insufficient to reduce materially the capacity of said condensation product to impart stain resistance to said synthetic polyamide textile substrate.
    Type: Grant
    Filed: April 5, 1990
    Date of Patent: October 23, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Theodor A. Liss, Leonard H. Beck
  • Stain resistant polymers and textiles
    Patent number: 4963409
    Abstract: Synthetic polyamide textile substrate having deposited thereon a modified polymeric sulfonated phenol-formaldehyde condensation product comprising one (a) in which 10 to 25% of the polymer units contain SO.sub.3 (-) radicals and about 90 to 75% of the polymer units contain sulfone radicals and (b) in which a portion of the free hydroxyl groups thereof has been acylated or etherified, the number of said hydroxyl groups which has been acylated or etherified being sufficient to inhibit yellowing of said condensation product but insufficient to reduce materially the capacity of said condensation product to impart stain resistance to said synthetic polyamide textile substrate.
    Type: Grant
    Filed: November 23, 1987
    Date of Patent: October 16, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Theodor A. Liss, Leonard H. Beck