Patents by Inventor Byford D. Sheffield

Byford D. Sheffield 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).

  • Use of ethyleneamine for washing pulp containing lignin
    Patent number: 5641385
    Abstract: Ethyleneamines are used in washing pulp to remove lignin. A process for washing a cellulose pulp mixture containing lignin to remove at least a portion of the lignin therefrom comprises use of a washing composition with at least about 100 ppm of an ethyleneamine. The process includes an improvement in a washing process a cellulose pulp mixture containing lignin wherein a washing composition is used to remove at least a portion of the lignin, the improvement comprising use of at least about 100 ppm of an ethyleneamine with the washing composition and/or using an amount of ethyleneamine at least equivalent to about 100 ppm based on the washing composition with the washing composition. The washing composition is also novel and includes a washing composition for washing kraft pulp comprising water and at least about 100 ppm of an ethyleneamine.
    Type: Grant
    Filed: January 17, 1995
    Date of Patent: June 24, 1997
    Assignee: The Dow Chemical Company
    Inventors: Alan P. Croft, Byford D. Sheffield
  • Process to increase the drying rate of a glaze for ceramics
    Patent number: 5300324
    Abstract: The drying rate of glazes containing water used to coat ceramic articles is increased by addition of aminoethylethanolamine, one or more polyalkylene polyamines with or without a small amount of a styrene-butadiene latex.
    Type: Grant
    Filed: May 29, 1992
    Date of Patent: April 5, 1994
    Assignee: The Dow Chemical Company
    Inventors: Alan P. Croft, Byford D. Sheffield
  • Process for converting alkali metal iodates to periodates
    Patent number: 4176167
    Abstract: Alkali metal iodates are converted to the corresponding periodate by contacting the iodate with a hydroxide of the same or different alkali metal and an oxygen containing gas at temperatures of from 150.degree. C. to 600.degree. C.
    Type: Grant
    Filed: September 19, 1977
    Date of Patent: November 27, 1979
    Assignee: The Dow Chemical Company
    Inventors: Robert T. Jernigan, Byford D. Sheffield
  • Amine-modified polyethers
    Patent number: 4056510
    Abstract: Water-soluble amine-modified polyethers are made by reacting an excess of alkylene polyamine such as ethylenediamine or diethylenetriamine with a halogen-containing polyether prepared byReacting with a poly epoxide:A. a halogen-containing alkylene oxide monomer, orB. a mixture thereof with a non-halogen-containing alkylene oxide monomer, wherein said mixture contains at least about 50 mole percent of said halogen-containing monomer.These amine modified polyethers may be additionally crosslinked by reacting with a difunctional compound, e.g. ethylene dichloride, to an extent which does not appreciably affect its solubility in water. The products are useful as drainage aids in paper pulp slurries and as flocculants.
    Type: Grant
    Filed: January 23, 1975
    Date of Patent: November 1, 1977
    Assignee: The Dow Chemical Company
    Inventors: Richard H. Symm, Byford D. Sheffield