Patents by Inventor Donna M. Mitko

Donna M. Mitko 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).

  • Toluene disproportionation catalyst
    Patent number: 5173461
    Abstract: A catalyst comprising a molecular sieve having a lattice aluminum content in which the silica/alumina framework mole ratio is less than 55, and having a diffusion rate constant of less than about 150 sec.sup.-1 .times.10.sup.-6 is particularly useful for vapor-phase disproportionation of toluene.
    Type: Grant
    Filed: March 21, 1990
    Date of Patent: December 22, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Robert P. Absil, Scott Han, David S. Shihabi, David O. Marler, Clarence D. Chang, Donna M. Mitko
  • Synthesis of a synthetic porous crystalline material
    Patent number: 5173281
    Abstract: There is provided a method for preparing a synthetic crystalline material from a reaction mixture including an organic directing agent selected from 1,4-diazacycloheptane (i.e. homopiperazine), azacyclooctane (i.e. heptamethyleneimine), aminocyclohexane (i.e. cyclohexylamine), aminocyclopentane (i.e. cyclopentylamine) and aminocycloheptane (i.e. cycloheptylamine). The crystalline material may be an aluminosilicate zeolite having considerable catalytic activity, e.g. for hydrocarbon conversion reactions.
    Type: Grant
    Filed: October 7, 1991
    Date of Patent: December 22, 1992
    Assignee: Mobil Oil Corp.
    Inventors: Clarence D. Chang, Donna M. Mitko