Patents by Inventor John Hull, Jr.

John Hull, Jr. 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).

  • Process for recovering quaternary salt bromination catalyst
    Patent number: 11786891
    Abstract: Quaternary ammonium tribromides and quaternary phosphonium tribromides are recovered from an organic solvent by washing with an aqueous hydrazine solution. The hydrazine reacts to form nitrogen, hydrobromic acid and a quaternary ammonium or quaternary phosphonium monobromide. The hydrobromic acid and quaternary ammonium or quaternary phosphonium migrate to the aqueous phase, thereby effecting the removal of the tribromides from the organic solvent. The hydrobromic acid can be neutralized with a quaternary ammonium or quaternary phosphonium hydroxide to produce a quaternary ammonium or quaternary phosphonium monobromide. The monobromides produced can be reacted with elemental bromine to regenerate a tribromide brominating agent.
    Type: Grant
    Filed: May 19, 2022
    Date of Patent: October 17, 2023
    Assignee: DDP SPECIALTY ELECTRONIC MATERIALS US, LLC
    Inventors: Longyan Liao, Shari Kram, Mark Rickard, Yiyong He, John Hull, Jr.
  • PROCESS FOR RECOVERING QUATERNARY SALT BROMINATION CATALYST
    Publication number: 20220370994
    Abstract: Quaternary ammonium tribromides and quaternary phosphonium tribromides are recovered from an organic solvent by washing with an aqueous hydrazine solution. The hydrazine reacts to form nitrogen, hydrobromic acid and a quaternary ammonium or quaternary phosphonium monobromide. The hydrobromic acid and quaternary ammonium or quaternary phosphonium migrate to the aqueous phase, thereby effecting the removal of the tribromides from the organic solvent. The hydrobromic acid can be neutralized with a quaternary ammonium or quaternary phosphonium hydroxide to produce a quaternary ammonium or quaternary phosphonium monobromide. The monobromides produced can be reacted with elemental bromine to regenerate a tribromide brominating agent.
    Type: Application
    Filed: May 19, 2022
    Publication date: November 24, 2022
    Inventors: Longyan LIAO, Shari KRAM, Mark RICKARD, Yiyong HE, John HULL, JR.
  • Process for the preparation of 2-alkylpyrimidines
    Patent number: 4999427
    Abstract: 2-Alkylpyrimidines are prepared from 1,3-diaminopropane and an appropriate alkanecarboxylic acid in a continuous vapor phase process without isolating any of the reaction intermediates. Improvements in each reaction step, namely, the amidation, the cyclization/dehydration and the dehydrogenation, contribute to the overall success of the continuous vapor phase process.
    Type: Grant
    Filed: May 16, 1988
    Date of Patent: March 12, 1991
    Assignee: DowElanco
    Inventor: John Hull, Jr.