Patents by Inventor David W. Wade

David W. Wade 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).

  • Filtration of sewage sludge
    Patent number: 4481115
    Abstract: An organic suspension, such as sewage sludge, is conditioned by adding a conditioner and then filtering the suspension through a filter element to form a filter cake on the element. Improved dryness properties of the cake are obtained by using as conditioner during the formation of at least the first half (by weight solids), but not all, of the cake a high molecular weight polyelectrolyte conditioner and by using as conditioner during the formation of the remainder of the cake an inorganic conditioner or a low molecular weight polyelectrolyte conditioner.
    Type: Grant
    Filed: February 10, 1983
    Date of Patent: November 6, 1984
    Assignee: Allied Colloids Limited
    Inventors: David W. Wade, Graham G. Dawson