Patents by Inventor John Christensen

John Christensen 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: 6360898
    Abstract: A filter and housing for waste water treatment includes a housing having a plurality of coaxially mounted vertically extending sections adaptable to receive a filter cartridge therein. An upper section is provided with an outlet consisting of at least two coaxially aligned rings of preselected diameters wherein the thickness of the rings and the spacing between the rings is sufficient to receive waste water treatment outlets of different diameters. The filter cartridge is comprised of a stacked arrangement of a plurality of disc-dam units wherein each disc-dam unit is provided with a serpentine configured first dam, the first dam extending upwardly from an upper surface of the disc-dam unit, the first dam having terminating ends spaced at outer terminating edges of the disc dam unit to define a cord segment therebetween. The terminating ends are connected by a second dam having a height less than the first dam.
    Type: Grant
    Filed: April 6, 2000
    Date of Patent: March 26, 2002
    Inventors: Harry L. Nurse, Jr., John Christensen
  • Patent number: 6306299
    Abstract: A filter and housing for waste water treatment includes a housing having a plurality of coaxially mounted vertically extending sections adaptable to receive a filter cartridge therein. An upper section is provided with an outlet consisting of at least two coaxially aligned rings of preselected diameters wherein the thickness of the rings and the spacing between the rings is sufficient to receive waste water treatment outlets of different diameters. The filter cartridge is comprised of a stacked arrangement of a plurality of disc-dam units wherein each disc-dam unit is provided with a serpentine configured first dam, the first dam extending upwardly from an upper surface of the disc-dam unit, the first dam having terminating ends spaced at outer terminating edges of the disc dam unit to define a cord segment therebetween. The terminating ends are connected by a second dam having a height less than the first dam.
    Type: Grant
    Filed: April 6, 2000
    Date of Patent: October 23, 2001
    Inventors: Harry L. Nurse, Jr., John Christensen
  • Patent number: 6111170
    Abstract: Selected endophytes of the genus Neotyphodium (formerly Acremonium) form stable synthetic combinations with tall fescue hosts (Festuca arundinacea). The combinations have improved resistance to invertebrate pests as compared to tall fescue cultivars not containing such endophytes. The particular combinations of the invention have reduced toxicity to livestock as compared to naturally occurring endophyte/tall fescue combinations. The seven preferred endophytes are AR501, AR502, AR510, AR542, AR572, AR577 and AR584.
    Type: Grant
    Filed: May 27, 1998
    Date of Patent: August 29, 2000
    Assignee: New Zealand Pastoral Agriculture Research Institute Limited
    Inventors: Garrick Cecil Morland Latch, Michael John Christensen, Brian Anthony Tapper, Herrick Sydney Easton, David Edward Hume, Lester Ronald Fletcher
  • Patent number: 6072107
    Abstract: Selected endophytes of the genus Neotyphodium (formerly Acremonium) form stable synthetic combinations with ryegrass hosts (preferably Lolium perenne). The combinations have improved resistance to invertebrate pests and drought effects as compared to ryegrass cultivars not containing such endophytes. The particular combinations of the invention have reduced toxicity to livestock as compared to naturally occurring endophyte/ryegrass combinations. The six preferred endophytes are AR1, AR12, AR22, AR50, AR52 and AR56.
    Type: Grant
    Filed: May 27, 1998
    Date of Patent: June 6, 2000
    Assignee: New Zealand Pastoral Agriculture Research Institute Limited
    Inventors: Garrick Cecil Morland Latch, Michael John Christensen, Brian Anthony Tapper, Herrick Sydney Easton, David Edward Hume, Lester Ronald Fletcher
  • Patent number: 5884578
    Abstract: The present invention relates to a flag which is adapted to keep the flag distended and appearing as natural as possible under all wind and weather conditions. The flag includes a flexible bar (1), the ends of which are retained in pockets (2 and 3) along the upper rim (4) of the flag and the rim (5) of the flag adjacent the flagpole, whereby the bar is firmly fixed and extends substantially in the plane of the flag while forming a curve extending upwards towards the upper corner of the flag adjacent the flagpole. The flag includes a fixing part (6) for the bar in an area between the pockets. The fixing part includes a strip of the flag resulting from two short cuts (7 and 8) therein.
    Type: Grant
    Filed: January 23, 1998
    Date of Patent: March 23, 1999
    Inventors: Christian Thostrup, John Christensen
  • Patent number: 4704565
    Abstract: An electron gun system according to the invention comprises means including cathode means for developing an electron beam. Main focus lens means, which has a plurality of electrode means situated on a common axis, provide for receiving the electron beam and forming a focused electron beam spot at the screen of the tube. Means are provided for developing and applying to the electrode means potentials effective to form one or more focusing field components between the electrode means. The lens means is so structured and arranged as to cause to be formed between adjacent electrode means at least one focusing field component which is asymmetrical and effective to significantly divert a passed beam from a straight-line path through a predetermined angle. A first of the plurality of electrode means comprises focus electrode means adapted to receive focus voltages for establishing the focal distance of the beams.
    Type: Grant
    Filed: February 21, 1986
    Date of Patent: November 3, 1987
    Assignee: Zenith Electronics Corporation
    Inventors: Allen P. Blacker, Jr., John A. Christensen, Khem K. S. Garewal
  • Patent number: 4168452
    Abstract: This disclosure depicts an electron gun especially for use in a color cathode ray tube of the small-neck, shadow-mask type. The gun design is also applicable to other television cathode ray tube displays that require a gun that provides small, symmetrical spots of uniform cross-section, such as guns used in monochrome television and beam index tubes. The gun is comprised essentially of a four-element tetrode section and a main focus lens section. The tetrode section generates at least one electron beam and a cross-over that is imaged on the screen of the tube focused by the main focus lens. The tetrode section is characterized by having a strong prefocus; that is, a prefocus in which the electron trajectories are substantially refracted, or bent, before exiting the tetrode section.
    Type: Grant
    Filed: December 15, 1977
    Date of Patent: September 18, 1979
    Assignee: Zenith Radio Corporation
    Inventors: John A. Christensen, Peter E. Loeffler, James W. Schwartz
  • Patent number: 4039771
    Abstract: The invention relates to a coffee maker assembly which has a heat exchanger having inlet and outlet pipes. Heat for the heat exchanger is supplied by an electrical heating element. In one embodiment a PTC resistor is in series with the heating element and thermal connections are provided between the resistor and other parts of the system. This allows thermal conditions to be sensed which alter the resistance of the PTC resistor to effect a temperature control by varying the magnitude of current supplied to the heating element. Another embodiment illustrates the heating element itself being formed by an annularly shaped PTC resistor.
    Type: Grant
    Filed: December 10, 1976
    Date of Patent: August 2, 1977
    Assignee: Danfoss A/S
    Inventors: Flemming Thorsoe, Niels Lervad Andersen, John Christensen
  • Patent number: 4039772
    Abstract: The invention relates to a coffee maker of the type consisting of a water tank at the top, a discharge device at the bottom, connected via a pipe to an electrically heated heat exchanger which has a riser pipe with an outlet nozzle connected to its opposite end, plus a warming plate for a coffeepot to be placed under the outlet nozzle.
    Type: Grant
    Filed: June 2, 1976
    Date of Patent: August 2, 1977
    Assignee: Danfoss A/S
    Inventors: Flemming Thorsoe, Niels Lervad Andersen, John Christensen
  • Patent number: D252769
    Type: Grant
    Filed: May 2, 1977
    Date of Patent: August 28, 1979
    Inventors: Sungjae Shin, John Christensen, Paul Han