Patents by Inventor Richard H. Dumas

Richard H. Dumas 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).

  • Antimicrobial protection for plastic structures
    Publication number: 20110123587
    Abstract: Disclosed is a composition and method for providing antimicrobial protection to plastic structures, such as plastic decking, planking, fencing, and panels. The method comprises applying a water-soluble biocide to the metal-containing structure, and converting the soluble biocide to a water-insoluble metal biocide salt that is adsorbed on the surface of, or into the porous structure of the plastic material. The slow release of the insoluble antimicrobial agent from the surface or from within the pores of said plastic structure provides antimicrobial protection for the plastic structure.
    Type: Application
    Filed: January 25, 2011
    Publication date: May 26, 2011
    Inventors: Bonnie B. Sandel, Richard H. Dumas, Patricia A. Turley
  • Method for producing particles of pyrithione salts and particles so produced
    Patent number: 6017936
    Abstract: The present invention relates to a method for producing submicron-sized particles of pyrithione salts, comprising reacting pyrithione or a water-soluble salt of pyrithione and a water-soluble polyvalent metal salt in a pressurized turbulent flow reactor that generates pulverizing forces, the reaction producing submicron sized particles of pyrithione salt. The present invention also relates to particles made by the above method, and products, such as shampoos, soaps, and skin care medicaments made using these particles.
    Type: Grant
    Filed: March 2, 1998
    Date of Patent: January 25, 2000
    Assignee: Arch Chemicals, Inc.
    Inventors: George A. Polson, Richard H. Dumas, Rahim Hani
  • Process for preparing 2,6-dichloropyridine
    Patent number: 5468864
    Abstract: The present invention relates to a process for preparing 2,6-dichloropyridine which comprises reacting an organic solvent-free, catalyst-free reaction mixture comprising 2-chloropyridine and chlorine in the presence of a hydrogen chloride scavenger and ultraviolet light, and optionally in the presence of added moisture, at a temperature of between about 90.degree. C. and about 185.degree. C. Also claimed is a method for preventing calcium chloride plugging of the chlorine feed stream and for preventing calcium chloride build-up in the above reaction mixture which comprises adding moisture in the form of water or steam, or a combination thereof, to the reaction mixture prior to, or during, the reaction of said process.
    Type: Grant
    Filed: February 3, 1994
    Date of Patent: November 21, 1995
    Assignee: Olin Corporation
    Inventors: Rahim Hani, Richard H. Dumas, David F. Gavin, Charles H. Harrison, Michael A. Kennedy, Henry W. Schiessl, Robert E. McMahon, Steven A. Manke
  • Process for oxidizing halopyridines to halopyridine-N-oxides
    Patent number: 4504667
    Abstract: Described is a process for oxidizing 2-chloropyridine or 2-bromopyridine to the corresponding N-oxide with peracetic acid generated in-situ from H.sub.2 O.sub.2 and acetic acid in the presence of a catalyst selected from the group consisting of maleic acid, maleic anhydride, phthalic anhydride, and mixtures thereof.
    Type: Grant
    Filed: June 24, 1983
    Date of Patent: March 12, 1985
    Assignee: Olin Corporation
    Inventors: Lawrence E. Katz, Richard H. Dumas