Patents by Inventor Joseph G. Wirth

Joseph G. Wirth 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).

  • 4,4'-Isopropylidene-bis(3- and 4-phenyleneoxyphthalic anhydride)
    Patent number: 3972902
    Abstract: Aryloxy dianhydrides are prepared from the hydrolysis of the reaction product of a nitro-substituted phenyl dinitrile with a metal salt of a dihydroxy aryl compound in the presence of a dipolar aprotic solvent.
    Type: Grant
    Filed: August 18, 1972
    Date of Patent: August 3, 1976
    Assignee: General Electric Company
    Inventors: Darrell R. Heath, Joseph G. Wirth
  • Aromatic bis(ether phthalis anhydride) compounds
    Patent number: 3956320
    Abstract: Aromatic bis(ether anhydride)s are prepared from the hydrolysis of the reaction product of a nitro-substituted phenyl dinitrile with a metal salt of a dihydroxy aryl compound in the presence of a dipolar aprotic solvent.
    Type: Grant
    Filed: August 2, 1974
    Date of Patent: May 11, 1976
    Assignee: General Electric Company
    Inventors: Darrell R. Heath, Joseph G. Wirth
  • Polyetherquinoxalines
    Patent number: 3956238
    Abstract: Polyetherquinoxalines are provided which are useful as injection molding compounds. The polyetherquinoxalines are the product of reaction of organic tetramine and bis(aromatic ether aromatic diketones).
    Type: Grant
    Filed: August 26, 1974
    Date of Patent: May 11, 1976
    Assignee: General Electric Company
    Inventors: Darrell R. Heath, Joseph G. Wirth