Patents by Inventor Leroy M. Konzelman

Leroy M. Konzelman 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 preparing methylene blue
    Patent number: 4212971
    Abstract: Methylene Blue and the zinc chloride double salt thereof are prepared by using manganese dioxide as the oxidizing agent in the substantial absence of toxic dichromates.
    Type: Grant
    Filed: March 8, 1979
    Date of Patent: July 15, 1980
    Assignee: American Cyanamid Company
    Inventors: Fredrik V. Randvere, Leroy M. Konzelman