Patents by Inventor Halbert C. White

Halbert C. White 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).

  • Method of preparing substituted phthalides
    Patent number: 4322356
    Abstract: Method of preparing chlorthalidone, an antihypertensive agent, and derivatives using a novel 3-(4'-chloro-3'-chlorosulfonylphenyl)phthalide intermediate and derivatives, and method of preparing said novel intermediate, are disclosed.
    Type: Grant
    Filed: March 24, 1980
    Date of Patent: March 30, 1982
    Assignee: The Dow Chemical Co.
    Inventors: Thomas J. Giacobbe, Halbert C. White
  • Substituted phthalide derivatives
    Patent number: 4188330
    Abstract: Method of preparing chlorthalidone, an antihypertensive agent, and derivatives using a novel 3-(4'-chloro-3'-chlorosulfonylphenyl)phthalide intermediate and derivatives, and method of preparing said novel intermediate, are disclosed.
    Type: Grant
    Filed: October 10, 1978
    Date of Patent: February 12, 1980
    Assignee: The Dow Chemical Company
    Inventors: Thomas J. Giacobbe, Halbert C. White