Patents by Inventor Efton E. Hatfield

Efton E. Hatfield 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).

  • Process of recycling animal waste
    Patent number: 4349572
    Abstract: Livestock and poultry excreta can be treated to destroy pathogenic bacteria therein and to eliminate offensive odors by contacting the excreta with from 0.10 to 3% by weight of the waste matter of a liquid aldehyde, preferably formaldehyde in aqueous solution.
    Type: Grant
    Filed: September 19, 1978
    Date of Patent: September 14, 1982
    Inventors: Roger R. Larson, Efton E. Hatfield