Patents by Inventor Thomas M. Hopkins

Thomas M. Hopkins 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).

  • Bracket mountable to an upright support for holding a sign
    Patent number: 5335889
    Abstract: A bracket serving as a sign support by providing a leg and a foot with a multiple of retainers carried by the leg and foot for holding the sign in a vertical orientation.
    Type: Grant
    Filed: February 12, 1993
    Date of Patent: August 9, 1994
    Assignee: Hall Signs, Inc.
    Inventors: Thomas M. Hopkins, Larry W. Hall
  • Scale inhibition formulations for kraft digesters
    Patent number: 4799995
    Abstract: Inhibition of calcium scale under the extreme temperature conditions found in pulp digesters has been accomplished by employing certain mixtures of polaminopoly(alkylenephosphonic acids) together with nonionic surfactants. Diethylenetriaminepenta(methylenephosphonic acid) together with a polyethoxynonylphenol has been found especially effective for the purpose.
    Type: Grant
    Filed: July 29, 1987
    Date of Patent: January 24, 1989
    Assignee: The Dow Chemical Company
    Inventors: Druce K. Crump, Lance A. Cooper, Thomas M. Hopkins
  • Process for the removal of H.sub.2 S from geothermal steam and the conversion to sulfur using ferric chelate and cationic polymer
    Patent number: 4683076
    Abstract: Process for removing H.sub.2 S from the exhaust steam in a geothermal power plant wherein the H.sub.2 S containing steam is contacted with an aqueous solution containing a ferric chelate and a cationic polymeric catalyst such as poly dimethyl diallyl ammonium chloride. The conversion of H.sub.2 S to sulfur is accelerated by the use of a small amount of the catalyst.
    Type: Grant
    Filed: April 4, 1986
    Date of Patent: July 28, 1987
    Assignee: The Dow Chemical Company
    Inventors: Robert D. Lampton, Jr., Thomas M. Hopkins, II
  • Process for the removal of H.sub.2 S from geothermal steam and the conversion to sulfur
    Patent number: 4629608
    Abstract: Process for removing H.sub.2 S from the exhaust steam in a geothermal power plant wherein the H.sub.2 S containing steam is contacted with an aqueous solution containing a ferric chelate and a cationic polymeric catalyst such as poly(dimethyldiallyl ammonium chloride). The conversion of H.sub.2 S to sulfur is accelerated by the use of a small amount of the catalyst.
    Type: Grant
    Filed: June 24, 1985
    Date of Patent: December 16, 1986
    Assignee: The Dow Chemical Company
    Inventors: Robert D. Lampton, Jr., Thomas M. Hopkins, II
  • Process for removal of H.sub.2 S from geothermal steam and the conversion to soluble sulfur compounds
    Patent number: 4614644
    Abstract: A process for the removal of H.sub.2 S from a fluid stream whereby the H.sub.2 S is converted to soluble sulfur compounds by treatment with a solution of ferric chelates containing an oxidizing agent and a water soluble cationic polymeric catalyst such as poly(dimethyldiallyl ammonium chloride).
    Type: Grant
    Filed: September 13, 1985
    Date of Patent: September 30, 1986
    Assignee: The Dow Chemical Company
    Inventors: Robert D. Lampton, Jr., Thomas M. Hopkins, II