Patents by Inventor Anthony J. Rachwal

Anthony J. Rachwal 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 for thickening digested sludge
    Patent number: 4576719
    Abstract: The invention relates to a process for thickening digested sludge, comprising the steps of providing digested sludge to be thickened, and then passing a gas, preferably air, through the digested sludge at an intensity in the range of above 0.1 to 5 gas to 1 sludge, on a volume basis, per hour. Sludge can be thickened to greater than 5% solids in ten days, an improvement of nearly 10 times that of traditional practice, as shown respectively by plots B and A.
    Type: Grant
    Filed: February 28, 1984
    Date of Patent: March 18, 1986
    Assignee: Thames Water Authority
    Inventors: Brian J. E. Hurley, Anthony J. Rachwal