Patents by Inventor Donald E. Knapp

Donald E. Knapp 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).

  • Grinding of titaniferous ores to enhance recovery of titanium dioxide
    Patent number: 4321152
    Abstract: Significant enhancement of titanium dioxide recovery from a titaniferous ore is achieved by improving the efficiency of the comminution of the ore with the use of polyols of the formula:R--C--R'OH).sub.3wherein R is alkyl (C.sub.1 -C.sub.4), or hydroxyalkyl (C.sub.1 -C.sub.4) containing up to 3 hydroxy groups, and wherein R' is alkylene (C.sub.1 -C.sub.4).
    Type: Grant
    Filed: October 21, 1980
    Date of Patent: March 23, 1982
    Assignee: American Cyanamid Company
    Inventors: Gerard M. Sheehan, Donald E. Knapp
  • Anatase pigment from ilmenite
    Patent number: 4183768
    Abstract: Titanium dioxide pigment of anatase crystal structure containing 0.05 to 0.3% Nb.sub.2 O.sub.5, 0.4 to 0.6% K.sub.2 O, 0.8 to 1.2% Sb.sub.2 O.sub.3, 0.2 to 0.4% P.sub.2 O.sub.5 and the balance substantially TiO.sub.2 ; the particles of said pigment having a surface coating of hydrous metal oxide, such as alumina. Such pigment is useful as a delustrant in synthetic fibers, such as cellulose acetate.
    Type: Grant
    Filed: March 3, 1975
    Date of Patent: January 15, 1980
    Assignee: American Cyanamid Company
    Inventors: Donald E. Knapp, Gerard M. Sheehan