Patents by Inventor Stanley Chaberek

Stanley Chaberek 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 nitrilotriacetonitrile
    Patent number: 3984453
    Abstract: The preparation of methylene-bis-iminodiacetonitrile and nitrilotriacetonitrile by the reaction of formaldehyde, ammonia and hydrogen cyanide under acidic conditions involving a particular procedure of adding hydrogen cyanide to an acidified liquid phase adduct of ammonia and formaldehyde; the preparation of nitrilotriacetonitrile from methylene-bis-iminodiacetonitrile; and the preparation of nitrilotriacetic acid from methylene-bis-iminodiacetonitrile by carboxymethylation under alkaline conditions. Nitrilotriacetonitrile is particularly useful in the formation, by hydrolysis, of nitrilotriacetic acid of particular value as a chelating or complexing agent.
    Type: Grant
    Filed: November 3, 1971
    Date of Patent: October 5, 1976
    Assignee: Stauffer Chemical Company
    Inventor: Stanley Chaberek