Patents by Inventor Lawrence F. Rakestraw

Lawrence F. Rakestraw 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).

  • Patent number: 6447722
    Abstract: The present invention relates generally to novel water treatment compositions and methods of preparation and use. More particularly, the invention relates to solid water treatment compositions containing at least one halogen source and at least one amine compound. Methods of preparing solid water treatment compositions and methods for controlling biofouling, disinfecting, cleaning and water systems are also provided.
    Type: Grant
    Filed: December 4, 1998
    Date of Patent: September 10, 2002
    Assignee: Stellar Technology Company
    Inventor: Lawrence F. Rakestraw
  • Patent number: 5688515
    Abstract: Disclosed is a water stable tablet for disinfecting recirculating water systems comprising chlorinated isocyanurate, sodium bromide and a stabilizer which regulates the rate at the chlorinated isocyanurate and the sodium bromide are dissolved or dispersed in flowing water. The stabilizer may be an active chlorine stabilizer compound that is compatible with chlorinated isocyanurates in the solid state, capable of binding active halogen (chlorine or bromine in the +1 valence state), and less soluble when fully chlorinated than in the less than chlorinated state.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: November 18, 1997
    Assignee: Occidental Chemical Corporation
    Inventors: Thomas C. Kuechler, Lawrence F. Rakestraw
  • Patent number: 5662940
    Abstract: Improved biocidal composition and method for controlling biofouling and microorganism population levels in recirculating water systems such as cooling towers, swimming pools or spas is disclosed and claimed. The composition comprises a hypochlorite donor and a bromide ion donor in proportions selected to maintain a mole ratio of the sum of all bromine containing species to the sum of all hypohalite species in the recirculating water of about 0.2 to about 20. The method comprises introducing into the recirculating water a mixture or combination of a hypochlorite donor and a bromide ion donor in an amount sufficient to maintain a ratio of the sum of all bromine containing species to the sum of all species in the recirculating water in the range of about 0.2 to about 20.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 2, 1997
    Assignee: University of Houston
    Inventors: Terry V. T. Hight, Jack V. Matson, Lawrence F. Rakestraw, Zhihe Zhang, Thomas C. Kuechler
  • Patent number: 5527547
    Abstract: Improved biocidal composition and method for controlling biofouling and microorganism population levels in recirculating water systems such as cooling towers, swimming pools or spas is disclosed and claimed. The composition comprises a hypochlorite donor and a bromide ion donor in proportions selected to maintain a mole ratio of the sum of all bromine containing species to the sum of all hypohalite species in the recirculating water of about 0.2 to about 20. The method comprises introducing into the recirculating water a mixture or combination of a hypochlorite donor and a bromide ion donor in an amount sufficient to maintain a ratio of the sum of all bromine containing species to the sum of all species in the recirculating water in the range of about 0.2 to about 20.
    Type: Grant
    Filed: April 4, 1995
    Date of Patent: June 18, 1996
    Assignee: The University of Houston
    Inventors: Terry V. T. Hight, Jack V. Matson, Lawrence F. Rakestraw, Zhihe Zhang, Thomas C. Kuechler
  • Patent number: 5476670
    Abstract: Improved biocidal composition and method for controlling biofouling and microorganism population levels in recirculating water systems such as cooling towers, swimming pools or spas is disclosed and claimed. The composition comprises a hypochlorite donor and a bromide ion donor in proportions selected to maintain a mole ratio of the sum of all bromine containing species to the sum of all hypohalite species in the recirculating water of about 0.2 to about 20. The method comprises introducing into the recirculating water a mixture or combination of a hypochlorite donor and a bromide ion donor in an amount sufficient to maintain a ratio of the sum of all bromine containing species to the sum of all species in the recirculating water in the range of about 0.2 to about 20.
    Type: Grant
    Filed: June 13, 1994
    Date of Patent: December 19, 1995
    Assignee: The University of Houston
    Inventors: Terry V. T. Hight, Jack V. Matson, Lawrence F. Rakestraw, Zhihe Zhang, Thomas C. Kuechler
  • Patent number: 5464636
    Abstract: Improved biocidal composition and method for controlling biofouling and microorganism population levels in recirculating water systems such as cooling towers, swimming pools or spas is disclosed and claimed. The composition comprises a hypochlorite donor and a bromide ion donor in proportions selected to maintain a mole ratio of the sum of all bromine containing species to the sum of all hypohalite species in the recirculating water of about 0.2 to about 20. The method comprises introducing into the recirculating water a mixture or combination of a hypochlorite donor and a bromide ion donor in an amount sufficient to maintain a ratio of the sum of all bromine containing species to the sum of all species in the recirculating water in the range of about 0.2 to about 20.
    Type: Grant
    Filed: March 14, 1994
    Date of Patent: November 7, 1995
    Assignee: The University of Houston
    Inventors: Terry V. T. Hight, Jack V. Matson, Lawrence F. Rakestraw, Zhihe Zhang, Thomas C. Kuechler
  • Patent number: 4643662
    Abstract: An apparatus is provided for pelletizing finely divided particulate or pulverant materials. The apparatus is particularly effective in pelletizing large quantities of such particulate materials to a desirable spheroidal pellet size.
    Type: Grant
    Filed: April 23, 1985
    Date of Patent: February 17, 1987
    Assignee: Monsanto Company
    Inventors: Lawrence F. Rakestraw, Harry M. Stevens
  • Patent number: 3996074
    Abstract: A method is disclosed for improving the hydrolytic stability of the adhesive bond between an RFL type organic adhesive and the steel reinforcing element in steel-rubber composite articles. This is accomplished by a pre-treatment of the steel surface before it is coated with the organic adhesive. The pre-treatment is conducted in a continuous operation which includes the sequential steps of: (1) cleaning the metal surface by a vapor degreasing method or by immersion in a detergent containing aqueous bath followed by a hot water rinse; (2) coating the surface with a crystalline or microcrystalline zinc phosphate; (3) rinsing the phosphated steel surface with water; (4) subjecting the phosphated surface to a chromate or chromic acid rinse; (5) rinsing again with deionized water; and finally (6) drying the steel reinforcing element.
    Type: Grant
    Filed: August 28, 1975
    Date of Patent: December 7, 1976
    Assignee: Monsanto Company
    Inventors: Lawrence F. Rakestraw, Richard W. Bullard, John E. Niesse, Malcolm F. Bender
  • Patent number: 3946794
    Abstract: A method is provided for preventing orifice plugging when melt extruding a steel-titanium alloy to form fine diameter wire. This is accomplished by controlling the oxygen potential in the melt above the orifice at a level wherein the activity of titania within the melt is maintained at from 0.3 to unity -- the standard state of unit activity being defined as the melt saturated in titania at the concentrations of titanium and oxygen therein and at the melt temperature.
    Type: Grant
    Filed: August 29, 1973
    Date of Patent: March 30, 1976
    Assignee: Monsanto Company
    Inventor: Lawrence F. Rakestraw