Patents by Inventor Lester R. Cohen

Lester R. Cohen 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).

  • Method for separating carboxylic acids from mixtures with non-acids
    Patent number: 4576683
    Abstract: A method for separating carboxylic acids from mixtures with non-acids by an extractive distillation method using a lactam with a 5- or 6-membered ring, preferably N-methyl-2-pyrrolidone, as an extractant to extract the acids from the mixture with non-acids, followed by separating the extracted acids from the extractant by rectification.
    Type: Grant
    Filed: June 6, 1984
    Date of Patent: March 18, 1986
    Assignee: Badger B.V.
    Inventor: Lester R. Cohen