Patents by Inventor John E. Alter

John E. Alter 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).

  • Extraction of citric acid
    Patent number: 4251671
    Abstract: Citric acid can be extracted from aqueous citric acid solutions by contacting such solutions with an N-substituted alkyl amide containing a total of at least twelve carbon atoms.
    Type: Grant
    Filed: October 5, 1979
    Date of Patent: February 17, 1981
    Assignee: Miles Laboratories, Inc.
    Inventors: John E. Alter, Ruth Blumberg