Patents by Inventor David C. Hibbard

David C. Hibbard 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).

  • Ultrafiltration of cooled milk
    Patent number: 5654025
    Abstract: A method for concentrating raw milk on farm before transportation to market comprises the steps of cooling the raw milk from the cow to a temperature of less than 45.degree. F. and directing the cooled raw milk through serial membrane separation units while maintaining the temperature to progressively increase the concentration of the raw milk in a single pass and to provide a permeate comprising water and lactose.
    Type: Grant
    Filed: October 30, 1995
    Date of Patent: August 5, 1997
    Inventors: Bala Raghunath, David C. Hibbard
  • Food processing wastewater treatment and recovery process
    Patent number: 5514282
    Abstract: A system and related method for the treatment of dairy and other food processing plant wastewaters provides recoverable by-products from two separate stages and a final water effluent clean enough for direct discharge or process reuse. The system provides an effective alternate to conventional wastewater treatment and includes, as its operating steps which provide useful by-products, dissolved air flotation and membrane separation. The recoverable by-products from these two unit operations are high in amino acids and provide sufficient nutritional value to permit their use as animal feed or fertilizer products.
    Type: Grant
    Filed: April 1, 1994
    Date of Patent: May 7, 1996
    Inventors: David C. Hibbard, Bala Raghunath, Craig S. Guyse