Patents by Inventor Rodney R. Ruskin

Rodney R. Ruskin 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).

  • Multi-layer drip irrigation conduit
    Patent number: 5332160
    Abstract: A water transmission tubing for controlling the flow of water under pressure comprises a tubular inner layer of generally uniform cross-sectional configuration continuous with the length of the tubing and having a biocide for killing bacteria in the water, and a tubular outer layer having an inner wall disposed against and bonded to an outer wall of the inner layer and being made of a material thickness for inhibiting the migration of biocide from the inner layer to the outside of the tubing.
    Type: Grant
    Filed: October 26, 1992
    Date of Patent: July 26, 1994
    Assignee: Agrifim Irrigation International N.V.
    Inventor: Rodney R. Ruskin
  • Process for making low cost drip irrigation lines using plastic extrusion and film blowing techniques
    Patent number: 5310438
    Abstract: A low cost drip irrigation line is made by molding a drip emitter having an elongated labyrinthine channel formed in the depth of the emitter body. A plastic film is extruded and passed through a film die with an air injection tube at one end forming a plastic film bubble. A feed tube sequentially feeds the emitters in series through the plastic film bubble and to the nip of laminating rolls for laminating the emitter to the plastic film bubble so that opposite wall portions of the plastic film are bonded to the opposite outer faces of the emitter. This encloses the labyrinthine channel and thereby forms a sealed labyrinthine passage.
    Type: Grant
    Filed: December 16, 1992
    Date of Patent: May 10, 1994
    Assignee: Agrifim Irrigation International N.V.
    Inventor: Rodney R. Ruskin
  • Pressure compensating drip irrigation system
    Patent number: 5052625
    Abstract: A drip irrigation system provides drip action of water flowing under pressure in an irrigation supply conduit. A drip emitter bonded to the exterior of the supply conduit receives water from the conduit passes the water through a pressure compensating labyrinthine channel formed internally in the emitter, and discharges the water from the channel at a greatly reduced pressure drop so the water drips at a slow drip rate. The emitter includes an elastomeric pressure compensating diaphragm contained within the emitter between the exterior of the supply conduit outer wall and the teeth of the labryinth. When water pressure is applied, the diaphragm is held in pressure contact with the ends of the teeth to form a pressure compensating side of the labyrinthine channel, for stabilizing the output drip rate of the emitter by accommodating flow pressure variations in the supply conduit.
    Type: Grant
    Filed: March 2, 1990
    Date of Patent: October 1, 1991
    Inventor: Rodney R. Ruskin