Patents by Inventor David G. Haslam

David G. Haslam 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 2,4- and 2,6-diaminotoluenes
    Patent number: 4256671
    Abstract: A process for the manufacture of 2,4- and 2,6-diaminotoluenes comprises catalytically hydrogenating the corresponding molten nitro compound in the presence of water, adding hydrochloric acid to form the monohydrochlorides, crystallizing 2,6-diaminotoluene monohydrochloride, filtering it off and, if desired, liberating the free bases by addition of an alkali.
    Type: Grant
    Filed: May 11, 1979
    Date of Patent: March 17, 1981
    Assignee: Clayton Aniline Company, Ltd.
    Inventors: John D. Hildreth, David G. Haslam, David E. Allen