Patents by Inventor Donald Frederick Evans

Donald Frederick Evans 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).

  • Absorbent and process for making same
    Publication number: 20010038820
    Abstract: There is provided a granular absorbent based on calcium sulfate that may be used for absorbing oil and water-based liquids. The absorbent includes calcium sulfate obtained from gypsum, waste gypsum from wallboard, waste gypsum separated from wallboard, synthetic gypsum and mixtures thereof. The granular absorbent is ground and screened to a particle size between 4 mesh and about 100 mesh. In another aspect of the invention, an effective amount of a binder such as a clay, lignin or starch is added to the calcium sulfate to assist the calcium sulfate to pelletize and form granules. The granules are sized and dried. The granular absorbents are effective in absorbing oil or water and are easily disposed of. There is also disclosed processes for making the granular absorbents.
    Type: Application
    Filed: December 5, 2000
    Publication date: November 8, 2001
    Applicant: Waste Reduction Products
    Inventors: Richard Binion Steele, Donald Frederick Evans
  • Soil amendment product and process
    Publication number: 20010029762
    Abstract: There is provided a soil amendment product of agglomerated or compacted calcined calcium sulfate. The soil amendment product is screened to a particle size between 6 mesh and about 100 mesh. In another aspect of the invention, an effective amount of a binder such as a clay, lignin or starch is added to the calcium sulfate to assist the calcium sulfate to pelletize. The pelletized calcium sulfate is sized and calcined. There is also disclosed processes for making the soil amendment products.
    Type: Application
    Filed: May 9, 2001
    Publication date: October 18, 2001
    Applicant: Waste Reduction Products Corporation
    Inventors: Richard Binion Steele, Donald Frederick Evans, Mark S. Booth, Malcolm J. Proper
  • Absorbent and process for making same
    Publication number: 20010002386
    Abstract: There is provided a granular absorbent based on calcium sulfate that may be used for absorbing oil and water-based liquids. The absorbent includes calcium sulfate obtained from gypsum, waste gypsum from wallboard, waste gypsum separated from wallboard, synthetic gypsum and mixtures thereof. The granular absorbent is ground and screened to a particle size between 4 mesh and about 100 mesh. In another aspect of the invention, an effective amount of a binder such as a clay, lignin or starch is added to the calcium sulfate to assist the calcium sulfate to pelletize and form granules. The granules are sized and dried. The granular absorbents are effective in absorbing oil or water and are easily disposed of. There is also disclosed processes for making the granular absorbents.
    Type: Application
    Filed: January 4, 2001
    Publication date: May 31, 2001
    Applicant: ABSORBENT AND PROCESS FOR MAKING SAME
    Inventors: Richard Binion Steele, Donald Frederick Evans
  • Process for making an animal litter comprising gypsum, aluminum sulfate and urea
    Patent number: 6206947
    Abstract: There is provided an animal litter composition of agglomerated or compacted calcined calcium sulfate absorbent. The animal litter is screened to a particle size between 6 mesh and about 100 mesh. In another aspect of the invention, an effective amount of a binder such as a clay, lignin or starch is added to the calcium sulfate to assist the calcium sulfate to pelletize. The pelletized calcium sulfate is sized and calcined. The litter compositions are effective in absorbing urine, clumping and are easily disposed of. There is also disclosed processes for making the animal litter compositions.
    Type: Grant
    Filed: December 30, 1999
    Date of Patent: March 27, 2001
    Assignee: Waste Reduction Products Corp.
    Inventors: Donald Frederick Evans, Richard Binion Steele, Malcolm Edward Sumner
  • Animal litter comprising gypsum and aluminum sulfate and processes of making same
    Patent number: 6029603
    Abstract: There is provided an animal litter composition of agglomerated or compacted calcined calcium sulfate absorbent. The animal litter is screened to a particle size between 6 mesh and about 100 mesh. In another aspect of the invention, an effective amount of a binder such as a clay, lignin or starch is added to the calcium sulfate to assist the calcium sulfate to pelletize. The pelletized calcium sulfate is sized and calcined. The litter compositions are effective in absorbing urine, clumping and are easily disposed of. There is also disclosed processes for making the animal litter compositions.
    Type: Grant
    Filed: April 30, 1998
    Date of Patent: February 29, 2000
    Assignee: Waste Reduction Products Corporation
    Inventors: Donald Frederick Evans, Richard Binion Steele, Malcolm Edward Sumner