Patents by Inventor Edwin R. Henson

Edwin R. Henson 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).

  • Corrosion inhibitors for aqueous brines
    Patent number: 4980074
    Abstract: A high density brine useful as a drilling fluid for deep wells is rendered corrosion resistant by the incorporation of a soluble aliphatic or aromatic aldehyde with or without olefinic unsaturation and with the use of alkali metal thiocyanates or ammonium thiocyanates. The aldehyde can be reacted with a primary amine prior to use.
    Type: Grant
    Filed: December 9, 1988
    Date of Patent: December 25, 1990
    Assignee: The Dow Chemical Company
    Inventors: Edwin R. Henson, Peter A. Doty
  • Use of phenyloxazoles as corrosion inhibitors
    Patent number: 4663121
    Abstract: The corrosion of metals in contact with corrosive fluids is effectively inhibited by the addition of one or more phenyloxazoles, preferably 2,5-diphenyloxazole.
    Type: Grant
    Filed: October 15, 1985
    Date of Patent: May 5, 1987
    Assignee: The Dow Chemical Company
    Inventors: Edwin R. Henson, Joel G. Courtwright
  • Corrosion inhibitors for alkanolamines
    Patent number: 4596849
    Abstract: This invention relates to a corrosion inhibiting composition for ferrous metals and its alloys in gas conditioning service using aqueous monoethanolamine to scrub carbon dioxide containing oxygen. The corrosion inhibiting composition includes a thiourea-amine-formaldehyde based polymer and, in the preferred embodiment, also includes a cupric ion producing material.
    Type: Grant
    Filed: October 29, 1984
    Date of Patent: June 24, 1986
    Assignee: The Dow Chemical Company
    Inventors: Edwin R. Henson, Joel G. Courtwright, Tipton T. Masterson
  • Corrosion inhibitors for alkanolamines
    Patent number: 4595723
    Abstract: This invention relates to a corrosion inhibiting composition for ferrous metals and its alloys in gas conditioning service using aqueous monoethanolamine to scrub carbon dioxide. The corrosion inhibiting composition includes a thiourea-amine-formaldehyde based polymer and, in the preferred embodiment, also includes a nickel ion producing material.
    Type: Grant
    Filed: October 29, 1984
    Date of Patent: June 17, 1986
    Assignee: The Dow Chemical Company
    Inventors: Edwin R. Henson, Tipton T. Masterson, Joel G. Courtwright
  • Preparation of 4-amino-3,5,6-trichloropicolinic acid
    Patent number: 4336384
    Abstract: In a new method of producing 4-amino-3,5,6-trichloropicolinic acid 3,4,5,6-tetrachloropicolinonitrile is reacted with ammonium hydroxide, preferably at about 130.degree. C. to about 160.degree. C. The free acid is precipitated upon acidification of the reaction mixture and may be recovered therefrom.
    Type: Grant
    Filed: April 23, 1981
    Date of Patent: June 22, 1982
    Assignee: The Dow Chemical Company
    Inventors: Edwin R. Henson, David J. Koranek