Patents by Inventor Carl T. Leffler

Carl T. Leffler 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).

  • Cationic fortified rosin size
    Patent number: 4219382
    Abstract: An acid-fortified rosin is reacted with a water-soluble polyalkylenepolyamine. The product is a modified rosin polyamidopolyamine. The product can be partially or completely neutralized with a rosin, thereby forming a rosin soap of the polyamidopolyamine. The products can be emulsified in water, and are cationic, anionic or non-ionic depending on the pH of the water. The emulsions are sizing agents for paper.
    Type: Grant
    Filed: February 19, 1976
    Date of Patent: August 26, 1980
    Assignee: American Cyanamid Company
    Inventor: Carl T. Leffler