Patents by Inventor by Dolores L. March, executrix

by Dolores L. March, executrix 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).

  • Ecological apparatus for processing sewage
    Patent number: 6132601
    Abstract: An improved, multipass, horizontal rotating continuous feed digester provides an efficient aerobic digestion process for sewage, and which also reduces pollution. The improved digester promotes the ecology in that the gas and air feed and exhaust means are located at opposite ends of the digester. Moreover, the air and gas distribution means can be easily removed from the digester for inspection and cleaning.
    Type: Grant
    Filed: March 5, 1998
    Date of Patent: October 17, 2000
    Inventors: Frank Ernest March, deceased, by Dolores L. March, executrix