Patents by Inventor Frederick S. Schell

Frederick S. Schell 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).

  • Low foaming surfactant
    Patent number: 4925988
    Abstract: A novel low foaming non-ionic surfactant having good wetting properties has a molecular weight of about 1700 to about 2300 and the formula:R--O--X--Y--Hwherein R is a primary alkyl group having about 6 to about 10 carbon atoms, X is a random mixture of EO and PO groups containing about 10 to about 12 EO groups and wherein the mole ratio of EO:PO groups is about 4:1, and Y is a PO block containing about 15 to about 25 PO groups, preferably about 21 to about 25.
    Type: Grant
    Filed: August 17, 1988
    Date of Patent: May 15, 1990
    Assignee: Hart Chemical Limited
    Inventors: Brigitte H. Licht, Roger T. Bentley, Frederick S. Schell
  • Water-emulsifiable defoamer composition
    Patent number: 4088601
    Abstract: Defoamer compositions, from which particulate inorganic solids are substantially absent, are described for use in hot and cold stock pulp mill and paper mill applications. The compositions are water-emulsifiable to form stable emulsions for ease of application in use. The composition contains low viscosity mineral oils, an aliphatic diamide, silicone oil and an ethoxylated alkyl substituted phenol.
    Type: Grant
    Filed: November 11, 1974
    Date of Patent: May 9, 1978
    Assignee: Hart Chemical Limited
    Inventors: Hugh J. S. Shane, Frederick S. Schell
  • Water-dispersible defoamer composition
    Patent number: 4024072
    Abstract: Water-dispersible defoamer compositions comprise an intimate blend of a mixture of defoaming components and at least one emulsifier to impart water-dispersibility to the composition. The defoaming components include a monoester of an alkenylated succinic acid, a particular organo-phosphorus compound and a silicone oil. The defoamer compositions have particular use in pulp mill defoaming compositions.
    Type: Grant
    Filed: February 18, 1976
    Date of Patent: May 17, 1977
    Assignee: Hart Chemical Limited
    Inventors: Hugh J. S. Shane, Frederick S. Schell, Mohammad A. Kasem