Patents by Inventor Sidney Berkowitz

Sidney Berkowitz 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).

  • Manufacture of cyanuric acid
    Patent number: 3996225
    Abstract: Waste digester liquor, containing dissolved triazines, ammonium salts and iron, is treated with a mineral base until the pH is about 2.5 to 4 whereby triazines are precipitated while most of the iron remains dissolved. The triazines are separated and recycled back to the digester. The pH of the filtrate is increased to about 11 and the ammonia stripped off and recovered leaving an essentially nitrogen free aqueous solution. This can be sewered directly or concentrated to recover the salts.
    Type: Grant
    Filed: December 9, 1975
    Date of Patent: December 7, 1976
    Assignee: FMC Corporation
    Inventors: Charles A. Gray, Sidney Berkowitz, James Lawrence Manganaro
  • Manufacture of cyanuric acid
    Patent number: 3996224
    Abstract: Waste digester liquor, containing dissolved triazines and iron, is treated with ammonia until the pH is about 2.5 to 4 thereby precipitating most of the triazines while leaving most of the iron in solution. The triazines are separated and recycled back to the digester. The filtrate of ammonium salts is useful as a source of fertilizer nitrogen.
    Type: Grant
    Filed: December 9, 1975
    Date of Patent: December 7, 1976
    Assignee: FMC Corporation
    Inventors: Charles A. Gray, Sidney Berkowitz, James Lawrence Manganaro
  • Hydrochlorination of vinylidene chloride to produce methyl chloroform
    Patent number: 3981939
    Abstract: Vinylidene chloride is hydrochlorinated to methyl chloroform by passing the reactants into a suspension of a Friedel-Crafts carrier, preferably ferric chloride, suspended in a liquid medium selected from the group consisting of 1,1,2-trichloroethane and perchloroethylene.
    Type: Grant
    Filed: June 13, 1975
    Date of Patent: September 21, 1976
    Assignee: FMC Corporation
    Inventors: Walter Lobunez, Sidney Berkowitz
  • Crude cyanuric acid purification
    Patent number: 3969352
    Abstract: Process for purifying crude cyanuric acid whereby crude cyanuric acid is digested with a mono-substituted salt of a dibasic or tribasic inorganic acid at a temperature of about 160.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: October 2, 1974
    Date of Patent: July 13, 1976
    Assignee: FMC Corporation
    Inventor: Sidney Berkowitz