Patents by Inventor Nai Yeun Chen

Nai Yeun Chen 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).

  • Alumina removal from crystalline alumino-silicates with Cr(III) solutions
    Patent number: 3937791
    Abstract: A method of removing alumina from a crystalline aluminosilicate composition having a silica/alumina mole ratio of from above 3 to about 12 which comprises heating said aluminosilicate composition to a temperature of greater than 50.degree.C. to about 100.degree.C. in the presence of a cationic form of chromium, preferably Cr.sup.+.sup.3, in aqueous solution of above 0.01 Normal of a chromium salt of a mineral acid whereby the pH is less than 3.5, and such that the atomic ratio of chromium to aluminum is greater than 0.5 for a time sufficient to remove the alumina. The method of this invention permits the aluminosilicate composition to retain substantial crystallinity. Organic compound conversion with the dealuminized material formed by the method of this invention may be advantageously utilized.
    Type: Grant
    Filed: August 17, 1973
    Date of Patent: February 10, 1976
    Assignee: Mobil Oil Corporation
    Inventors: William E. Garwood, Nai Yeun Chen, Stanley J. Lucki