Patents by Inventor Richard A. Ahlbeck

Richard A. Ahlbeck 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).

  • Lightweight aggregate
    Patent number: 4341562
    Abstract: A lightweight aggregate of low energy requirements for use in making lightweight concrete comprising cement kiln dust pellets or cement kiln dust and fly ash pellets which have been cured at low temperature and high humidity.
    Type: Grant
    Filed: March 21, 1980
    Date of Patent: July 27, 1982
    Assignee: N-Viro Energy Systems, Ltd.
    Inventor: Richard A. Ahlbeck