Patents by Inventor John C. Dalman

John C. Dalman 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).

  • Two-wire power and communications for irrigation systems
    Patent number: 7619322
    Abstract: A large number of irrigation system devices connected to a common two-wire cable can be powered and individually controlled from a central location by transmitting over the cable DC pulses of alternating polarity. Control information is conveyed by transmitting a command pulse train consisting of a series of pulses, separated by short no-power intervals, whose polarities indicate logic ones or zeros. Following a command pulse train, a selected watering station decoder acknowledges receipt of instructions by drawing current during a predetermined pulse of an alternating-polarity power pulse cycle, while a sensor decoder returns binary data by drawing current during one or the other of the alternating-polarity pulses of a series of power pulse cycles.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: November 17, 2009
    Assignee: The Toro Company
    Inventors: Randall James Gardner, Michael D. Heine, John C. Dalman
  • Two-Wire Power And Communications For Irrigation Systems
    Publication number: 20080211307
    Abstract: A large number of irrigation system devices connected to a common two-wire cable can be powered and individually controlled from a central location by transmitting over the cable DC pulses of alternating polarity. Control information is conveyed by transmitting a command pulse train consisting of a series of pulses, separated by short no-power intervals, whose polarities indicate logic ones or zeros. Following a command pulse train, a selected watering station decoder acknowledges receipt of instructions by drawing current during a predetermined pulse of an alternating-polarity power pulse cycle, while a sensor decoder returns binary data by drawing current during one or the other of the alternating-polarity pulses of a series of power pulse cycles.
    Type: Application
    Filed: April 14, 2008
    Publication date: September 4, 2008
    Inventors: Randall James Gardner, Michael D. Heine, John C. Dalman
  • Two-wire power and communications for irrigation systems
    Patent number: 7358626
    Abstract: A large number of irrigation system devices connected to a common two-wire cable can be powered and individually controlled from a central location by transmitting over the cable DC pulses of alternating polarity. Control information is conveyed by transmitting a command pulse train consisting of a series of pulses, separated by short no-power intervals, whose polarities indicate logic ones or zeros. Following a command pulse train, a selected watering station decoder acknowledges receipt of instructions by drawing current during a predetermined pulse of an alternating-polarity power pulse cycle, while a sensor decoder returns binary data by drawing current during one or the other of the alternating-polarity pulses of a series of power pulse cycles.
    Type: Grant
    Filed: May 25, 2005
    Date of Patent: April 15, 2008
    Assignee: The Toro Company
    Inventors: Randall James Gardner, Michael D. Heine, John C. Dalman