Patents by Inventor Walter F. Ahlberg, Jr.

Walter F. Ahlberg, Jr. 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).

  • Multi-purpose rotating membrane filter
    Patent number: 4925557
    Abstract: A multi-purpose rotating membrane filter unit wherein the central portion of hollow filter discs covered with controlled pore size membranes communicate with the interior of the hollow rotating mounting shaft with the membrane surface of the rotating disc being kept clean by speed of rotation and, in some cases intermittent back flushing, and with filtrate draw off thru the hollow rotating mounting shaft.
    Type: Grant
    Filed: April 14, 1989
    Date of Patent: May 15, 1990
    Inventors: Walter F. Ahlberg, Jr., Joseph F. Long