Patents by Inventor David R. Primus

David R. Primus 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: 5495814
    Abstract: A seed furrow cutting knife adapted for cutting a seed furrow, fluffing the furrow sidewalls to avoid soil compaction, and for offset placement of fertilizer in the furrow is provided. The furrow cutting knife has associated side wings for fluffing sidewalls of the seed furrow and for simultaneous discharge of liquid fertilizer through a fertilizer tube into the seed furrow, but offset from the bottom of the seed furrow to avoid burning of the seed.
    Type: Grant
    Filed: March 15, 1994
    Date of Patent: March 5, 1996
    Inventor: David R. Primus
  • Patent number: 4175872
    Abstract: The adapter for the liquid manure vacuum agitator of the present invention comprises an elongated cylindrical tubular member having opposite ends and an internal annular bore defined by the interior cylindrical wall of the tubular member. A continuous spiraling blade is attached to the interior of the cylindrical wall, the blade having sufficient width to extend partially radially inwardly to terminate in an inner end which is spaced axially outwardly from the centerline of the tubular member, thereby giving an open center through the tubular member along the longitudinal centerline thereof. The spiraling blade causes agitation of the manure as it is forced through the tube.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: November 27, 1979
    Inventor: David R. Primus
  • Patent number: 4142302
    Abstract: An improvement in the method of grain drying wherein grain is dried in a first drying bin and removed to a holding bin, the improvement comprising withdrawing hot air from the holding bin and circulating the hot air to the drying bin.
    Type: Grant
    Filed: March 16, 1977
    Date of Patent: March 6, 1979
    Inventor: David R. Primus