Patents by Inventor Darrell C. Symonds

Darrell C. Symonds 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).

  • Patent number: 5437336
    Abstract: A soilbed having a topsoil stratum and a subsurface hardpan stratum is fractured by a subsoiling tine to form a trench-like path which extends in depth at least partially into the hardpan stratum. One or more pairs of rotatable blades are operated thereafter which lift up, invert, and mound nutrient-rich topsoil from the topsoil stratum on either side of the trench-like path into the trench-like path. The mounded topsoil provides an unusually hospitable environment for plant growth, especially for the root systems of plants. Additional features, such as blade attachments, coulter disks, and a bulldozer blade may be provided to enable efficient operation with consistently beneficial results.
    Type: Grant
    Filed: April 19, 1993
    Date of Patent: August 1, 1995
    Inventor: Darrell C. Symonds
  • Patent number: 4974681
    Abstract: A method for fracturing below ground hardpan which includes entering a sub-soil tine beneath the lower surface of a layer of hardpan, with the upper surface angle of the tine in range of orientation which provides an improved fracturing width.
    Type: Grant
    Filed: December 16, 1988
    Date of Patent: December 4, 1990
    Inventor: Darrell C. Symonds
  • Patent number: 4821499
    Abstract: A rotary rake in which the angular relationship of pin wheels and swing arm supports relative to a forward direction is such as to cause debris being collected to be caused to roll to one side, thereby increasing debris-collection potential.
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: April 18, 1989
    Inventor: Darrell C. Symonds
  • Patent number: 4815545
    Abstract: Apparatus for fracturing below ground hard pans which includes entering a sub-soil tyne beneath the hard pan with upper surface angle in range of orientation which provides improved fracturing width.
    Type: Grant
    Filed: April 9, 1986
    Date of Patent: March 28, 1989
    Inventor: Darrell C. Symonds
  • Patent number: 4800713
    Abstract: A rotary rake in which each of the pin wheels (i.e. disk wheels) being arranged in echelon manner, has rearwardly inclined gaps between respective fingers whereby to promote removal of debris that otherwise will jam between the fingers.
    Type: Grant
    Filed: January 28, 1987
    Date of Patent: January 31, 1989
    Inventor: Darrell C. Symonds
  • Patent number: D267320
    Type: Grant
    Filed: November 7, 1979
    Date of Patent: December 21, 1982
    Inventor: Darrell C. Symonds