Patents by Inventor Howard Grabhorn

Howard Grabhorn 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).

  • Biofilter bags for erosion control
    Patent number: 6109835
    Abstract: A water permeable erosion control bag having a flexible mesh wall with openings through which water can flow. Discrete hammer-milled wood fragments are within the bag.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: August 29, 2000
    Assignee: Grabhorn, Inc.
    Inventor: Howard Grabhorn
  • Biofilter bags for erosion control
    Patent number: 5595458
    Abstract: A water permeable erosion control bag having a flexible mesh wall with openings through which water can flow. Discrete hammer-milled wood fragments within the bag.
    Type: Grant
    Filed: June 29, 1994
    Date of Patent: January 21, 1997
    Assignee: Grabhorn, Inc.
    Inventor: Howard Grabhorn