Patents by Inventor Daniel A. Singleton

Daniel A. Singleton 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).

  • Oxygen-substituted allyl cations as dienophiles
    Patent number: 4847392
    Abstract: A method of conducting a Diels-Alder reaction is provided comprising reacting a Diels-Alder diene comprising a 1,3-conjugated diene with a dienophile comprising an alpha,beta-unsaturated acetal or ketal in the presence of a protonating acid to yield a [4+2] cycloadduct.
    Type: Grant
    Filed: March 17, 1987
    Date of Patent: July 11, 1989
    Assignee: Regents of the University of Minnesota
    Inventors: Paul G. Gassman, Daniel A. Singleton
  • N-neopentyl-4-diorganoamino pyridinium compounds
    Patent number: 4605745
    Abstract: A method is provided for making aromatic ethers by effecting the displacement of reactive radicals on an activated aromatic nucleus such as a phthalimide with a mono or bisalkali metal phenoxide in the presence of an organic solvent and a dialkylamino branched alkyl substituted pyridinium salt as a phase transfer catalyst. Improved yields of bis(aromatic ethers) are achieved without the production of undesirable by-products, such as akylated phenols.
    Type: Grant
    Filed: December 24, 1984
    Date of Patent: August 12, 1986
    Assignee: General Electric Company
    Inventors: Daniel J. Brunelle, Daniel A. Singleton
  • Method for making aromatic ethers using diorganoamino pyridinum salt catalyst
    Patent number: 4513141
    Abstract: A method is provided for making aromatic ethers by effecting the displacement of reactive radicals on an activated aromatic nucleus such as a phthalimide with a mono or bisalkali metal phenoxide in the presence of an organic solvent and a dialkylamino branched alkyl substituted pyridinium salt as a phase transfer catalyst. Improved yields of bis(aromatic ethers) are achieved without the production of undesirable by-products, such as alkylated phenols.
    Type: Grant
    Filed: April 28, 1983
    Date of Patent: April 23, 1985
    Assignee: General Electric Company
    Inventors: Daniel J. Brunelle, Daniel A. Singleton