Patents by Inventor Derek P. Williams

Derek P. Williams 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).

  • Method for treating hog and animal waste
    Publication number: 20030057160
    Abstract: An animal treatment method comprises flushing the animal waste from a barn to a holding tank where the waste is mixed with an alkaline solution to kill pathogens. After neutralization, the solution is separated into solids and liquids. The liquid is treated and recycled as flushing water to clean the barns and/or drinking water for the animals. The solids are separated into digested and undigested feed. The digested feed is further processed for use as a fertilizer and the undigested feed is processed for use as animal feed.
    Type: Application
    Filed: September 26, 2001
    Publication date: March 27, 2003
    Inventors: Derek P. Williams, Christopher S. Williams, Allan E. Hokanson
  • Duct design calculator
    Patent number: D289414
    Type: Grant
    Filed: June 19, 1985
    Date of Patent: April 21, 1987
    Assignee: Carrier Corporation
    Inventors: David C. Peters, Derek P. Williams, William C. Chadwick