Patents by Inventor Alain Rigouard

Alain Rigouard 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).

  • Waste water sludge thickener with odor control
    Patent number: 4711721
    Abstract: In a sludge thickener, supernatant fluid is drawn off via peripheral ducts and oxygenated at a suitable location. The supernatant fluid is thereafter reintroduced into the thickener via diffusers distributed transversely of the thickener and intermediate the peripheral ducts. The generation of nauseating smells is thereby prevented, and an advantageous increase of the concentration of the sludges is attained.
    Type: Grant
    Filed: June 25, 1985
    Date of Patent: December 8, 1987
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Bernard Jamonet, Alain Rigouard, Jean-Pierre Bouchez, Jean Duc
  • Process and device for the regeneration of a group of solid particles having a coating of a biological material
    Patent number: 4534864
    Abstract: The solid particles 33' coated with a biological material are developed at the upper end of a bed 32 which is fluidized by a supply of water 3. The particles 33' are removed at 12 and decanted at 11 and then introduced through a pipe 20 at the upper end 22 of an auxiliary anaerobic fermentation column which converts the biological coating into a gaseous mixture which escapes at 27. The regenerated particles are withdrawn at 28 and conveyed at 30 to the purifying bed. Application in the biological purification of waste waters.
    Type: Grant
    Filed: April 17, 1984
    Date of Patent: August 13, 1985
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Alain Rigouard