Patents by Inventor Lucia C. Tang

Lucia C. Tang 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 of stabilizing felted cellulosic sheet material with an alkali metal borohydride
    Patent number: 4401810
    Abstract: Felted cellulosic sheet material is treated with a solution of an alkali al borohydride in order to improve and stabilize its strength and brightness. A subsequent wash with deionized water or preferably an aqueous solution containing an alkaline earth metal hydroxide, carbonate, or bicarbonate further improves the stability of the brightness and strength of felted cellulosic sheet material. The washing of cellulosic sheet material is most efficiently accomplished in an apparatus providing a means to add a metered amount of alkaline earth metal hydroxide, carbonate, or bicarbonate to a continuously flowing stream of wash medium.
    Type: Grant
    Filed: September 8, 1981
    Date of Patent: August 30, 1983
    Assignee: United States of America as represented by the Librarian of Congress
    Inventors: Lucia C. Tang, Margaret A. Troyer