Patents by Inventor Harold Daniel Williamson

Harold Daniel Williamson 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).

  • Production of urea-formaldehyde concentrates
    Patent number: 3970625
    Abstract: A process for preparing an improved urea-formaldehyde concentrate particularly adapted for production of slow-release nitrogenous fertilizers. The improvement is achieved by accurately controlling the buffer strength and the degree of polymerization of the urea-formaldehyde concentrate within specified critical limits. The process can be operated to also produce a different urea-formaldehyde concentrate suitable for use in adhesives.
    Type: Grant
    Filed: November 14, 1974
    Date of Patent: July 20, 1976
    Assignee: Allied Chemical Corporation
    Inventors: William Percy Moore, James Earl Sansing, Harold Daniel Williamson