Patents by Inventor Hendricus A. Van Kruining

Hendricus A. Van Kruining 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).

  • Rice hull ash filter
    Patent number: 4765545
    Abstract: A rice-hull-ash filter aid is produced by burning rice hulls to produce ash, grinding the ash to reduce its particle size, classifying the ground ash to remove oversized particles and collecting the remaining particles.
    Type: Grant
    Filed: March 17, 1986
    Date of Patent: August 23, 1988
    Assignee: Ricegrowers' Co-operative Mills, Ltd.
    Inventor: Hendricus A. Van Kruining