Patents by Inventor Darrell R. Heath

Darrell R. Heath 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).

  • Polyolefin with phosphorylated novolac flame retardant, peroxide cured, as metallic insulator
    Patent number: 4105825
    Abstract: Flame-resistant, cured polyolefin compositions comprising phosphorylated novolac-type phenolformaldehyde condensate, electrical conductors insulated with said compositions, and method of producing same.
    Type: Grant
    Filed: July 2, 1976
    Date of Patent: August 8, 1978
    Assignee: General Electric Company
    Inventors: Darrell R. Heath, Fred F. Holub, Edward V. Wilkus
  • 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
  • Method of making aromatic bis(ether ortho phthalic acid)s
    Patent number: 3957862
    Abstract: Aromatic bis(ether anhydride)s can be made by a nitro displacement of an N-substituted nitrophthalimide with an alkali diphenoxide to produce an intermediate aromatic bis(etherphthalimide). Hydrolysis of the aromatic bis(etherphthalimide) to the corresponding tetra-acid salt followed by acidification and dehydration, results in the production of the aromatic bis(ether anhydride). These anhydrides can be used as intermediates for making polyimides. The intermediate aromatic bis(etherphthalimide) can be employed as a plasticizer in polyimide resins.
    Type: Grant
    Filed: December 6, 1974
    Date of Patent: May 18, 1976
    Assignee: General Electric Company
    Inventors: Darrell R. Heath, Tohru Takekoshi
  • 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