Patents by Inventor Alexa A. Dembek

Alexa A. Dembek 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).

  • Polyhaloaromatic ruthenium complexes and reactions thereof
    Patent number: 5386044
    Abstract: Novel ruthenium pi-arene complexes in which the arene ring has 3 or more halogen atoms bound to it are disclosed. These compounds are reacted with phenoxides and thiophenoxides to form ruthenium pi-arene complexes of polyfunctional aromatic ethers and thioethers which are useful as monomers and crosslinking agents.
    Type: Grant
    Filed: November 30, 1993
    Date of Patent: January 31, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Alexa A. Dembek
  • Transition metal complexes of polyarylene oxides and sulfides
    Patent number: 5386001
    Abstract: Polyarylene oxides and sulfides which are .pi.-arene complexed with transition metals are disclosed. Also disclosed is a process for making a polyarylene sulfide by reaction of a .pi.-arene complexed arylene dihalide with the dianion of an arylene dithiol. The complexed polymers are soluble in common organic solvents, and the polymer solutions can be used to make films and coatings or to encapsulate parts.
    Type: Grant
    Filed: May 31, 1994
    Date of Patent: January 31, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Alexa A. Dembek, Marianne Marsi
  • Transition metal complexes of polyarylene oxides and sulfides
    Patent number: 5350832
    Abstract: Polyarylene oxides and sulfides which are .pi.-arene complexed with transition metals are disclosed. Also disclosed is a process for making a polyarylene sulfide by reaction of a .pi.-arene complexed arylene dihalide with the dianion of an arylene dithiol. The complexed polymers are soluble in common organic solvents, and the polymer solutions can be used to make films and coatings or to encapsulate parts.
    Type: Grant
    Filed: December 14, 1992
    Date of Patent: September 27, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Alexa A. Dembek, Marianne Marsi
  • Chromium carbonyl complexes of polyamide
    Patent number: 5233004
    Abstract: Disclosed herein are chromium carbonyl complexes of polyamides containing units derived from aromatic diamines in which about 10 to about 90% of those units are complexed with a chromium carbonyl compound, and a process for making them. When aramids are used, the solubility of the polymer in organic solvents is enhanced, and in the case of certain aramids lyotropic solutions are formed. These solutions can be used to make anisotropic films and fibers.
    Type: Grant
    Filed: May 20, 1992
    Date of Patent: August 3, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Alexa A. Dembek, Andrew E. Feiring