Patents by Inventor Tama Lee Drenski

Tama Lee Drenski 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).

  • Performance of used molybdenum based catalysts by the addition of ammonium dimolybdate
    Patent number: 5877108
    Abstract: A process for regenerating molybdenum containing ammoxidation catalyst comprising replacing the molybdenum loss from the catalyst during the ammoxidation reaction wherein ammonium dimolybdenum is utilized as the source for replacement of the molybdenum loss from the original catalyst.
    Type: Grant
    Filed: December 11, 1997
    Date of Patent: March 2, 1999
    Assignee: The Standard Oil Company
    Inventors: Dev Dhanaraj Suresh, Christos Paparizos, Michael J. Seely, Tama Lee Drenski, Maria Strada Friedrich
  • Catalyst for the manufacture of acrylonitrile and hydrogen cyanide
    Patent number: 5840648
    Abstract: A catalyst composition comprising a complex of catalytic oxides of iron, bismuth, molybdenum and calcium and characterized by the following empirical formula:A.sub.a B.sub.b C.sub.c D.sub.d Fe.sub.e Bi.sub.f MO.sub.12 O.sub.xwhere A=one or more of Li, Na, K, Rb and Cs or mixtures thereofB=one or more of Mg, Mn, Ni, Co, Ag, Pb, Re, Cd and Zn or mixtures thereofC=one or more of Ce, Cr, Al, Sb, P, Ge, La, Sn, V and W or mixtures thereofD=one or more of Ca, Sr, Ba or mixtures thereofand a=0.01 to 1.0; b and e=1.0-10; c, d, and f=0.1 to 5.0 and x is a number determined by the valence requirements of the other elements present.
    Type: Grant
    Filed: September 2, 1997
    Date of Patent: November 24, 1998
    Assignee: The Standard Oil Company
    Inventors: Dev Dhanaraj Suresh, Christos Paparizos, Michael J. Seely, Maria Strada Friedrich, Tama Lee Drenski
  • Ammoxidation catalysts containing germanium to produce high yields of acrylonitrile
    Patent number: 5770757
    Abstract: A catalyst having the atomic ratios set forth in the empirical formula below:A.sub.a B.sub.b C.sub.c Ge.sub.d Bi.sub.e Mo.sub..sub.12 O.sub.xwhereA=two or more of alkali metals, In and TlB=one or more of Mg, Mn, Ni, Co, Ca, Fe, Ce, Sm, Cr, Sb, and W; preferably B equals the combination of Fe and at least one element selected from the group consisting of Ni and Co and at least one element selected from the group consisting of Mg, Mn, Ca, Ce, Sn, Cr, Sb, and WC=one or more of Pb, Eu, B, Sn, Te and Cua=0.05 to 5.0b=5 to 12c=0 to 5.0d=0.1 to 2.0e=0.1 to 2.0x=the number of oxygen atoms required to satisfy the valency requirements of the other elements andb>a+c.
    Type: Grant
    Filed: May 3, 1996
    Date of Patent: June 23, 1998
    Assignee: The Standard Oil Company
    Inventors: Tama Lee Drenski, Maria Strada Friedrich, Christos Paparizos, Michael J. Seely, Dev Dhanaraj Suresh
  • Ammoxidation catalysts containing germanium to produce high yields of acrylonitrile
    Patent number: 5688739
    Abstract: A catalyst having the atomic ratios set forth in the empirical formula below:A.sub.a B.sub.b C.sub.c Ge.sub.d Bi.sub.e Mo.sub.12 O.sub.xwhereA=two or more of alkali metals, In and TlB=one or more of Mg, Mn, Ni, Co, Ca, Fe, Ce, Sm, Cr, Sb, and W; preferably B equals the combination of Fe and at least one element selected from the group consisting of Ni and Co and at least one element selected from the group consisting of Mg, Mn, Ca, Ce, Sn, Cr, Sb, and WC=one or more of Pb, Eu, B, Sn, Te and Cua=0.05 to 5.0b=5 to 12c=0 to 5.0d=0.1 to 2.0e=0.1 to 2.0x=the number of oxygen atoms required to satisfy the valency requirements of the other elements andb>a+c.
    Type: Grant
    Filed: May 3, 1996
    Date of Patent: November 18, 1997
    Assignee: The Standard Oil Company
    Inventors: Tama Lee Drenski, Maria Strada Friedrich, Christos Paparizos, Michael J. Seely, Dev Dhanaraj Suresh