Patents by Inventor John D'Angelo

John D'Angelo 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 purifying crude cyanuric acid
    Patent number: 4016164
    Abstract: Process for purifying crude cyanuric acid whereby crude cyanuric acid is digested with an aqueous phosphoric acid solution containing about 10% to about 85% phosphoric acid at a temperature of about 180.degree. C to about 220.degree. C under at least the autogenously developed pressure to digest the crude cyanuric acid. A novel, large, free-flowing cyanuric acid product is recovered free of any hard cement-like masses.
    Type: Grant
    Filed: March 18, 1976
    Date of Patent: April 5, 1977
    Assignee: FMC Corporation
    Inventors: Sidney Berkowitz, John D'Angelo