Patents by Inventor David L. Fehr

David L. Fehr 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: 10688509
    Abstract: A control method for a two-component spray system having first and second pumps for separate fluid components includes registering a target spray pressure, registering a material-specific pressure factor margin, sensing an output pressure of the second pump, and identifying a failure condition in the event that the sensed output pressure remains further than the pressure factor margin from the target spray pressure for at least a threshold time.
    Type: Grant
    Filed: February 4, 2019
    Date of Patent: June 23, 2020
    Assignee: Graco Minnesota Inc.
    Inventors: David L. Fehr, John R. Ingebrand, Dennis J. Van Keulen
  • Publication number: 20190224700
    Abstract: A control method for a two-component spray system having first and second pumps for separate fluid components includes registering a target spray pressure, registering a material-specific pressure factor margin, sensing an output pressure of the second pump, and identifying a failure condition in the event that the sensed output pressure remains further than the pressure factor margin from the target spray pressure for at least a threshold time.
    Type: Application
    Filed: February 4, 2019
    Publication date: July 25, 2019
    Inventors: David L. Fehr, John R. Ingebrand, Dennis J. Van Keulen
  • Publication number: 20190217323
    Abstract: A method for a system having a plurality of primary fluid sources and a fluid output with a common pump includes halting pumping of a first fluid, isolating the common pump from the fluid output and the primary fluid sources, connecting an inlet of the common pump to a solvent source and a compressed air source, and an outlet of the common pump to a waste fluid dump, filling the common pump with a first purge volume of solvent, cycling the common pump in a flush mode, operating the common pump in a timed flow mode, and connecting an inlet of the common pump to a second primary fluid source, and an outlet of the common pump to the output line, and starting pumping of a second fluid from the second primary fluid source through the output line.
    Type: Application
    Filed: March 22, 2019
    Publication date: July 18, 2019
    Inventors: David L. Fehr, Dennis J. Van Keulen
  • Patent number: 10300504
    Abstract: A method for a system having a plurality of primary fluid sources and a fluid output with a common pump includes halting pumping of a first fluid, isolating the common pump from the fluid output and the primary fluid sources, connecting an inlet of the common pump to a solvent source and a compressed air source, and an outlet of the common pump to a waste fluid dump, filling the common pump with a first purge volume of solvent, cycling the common pump in a flush mode, operating the common pump in a timed flow mode, and connecting an inlet of the common pump to a second primary fluid source, and an outlet of the common pump to the output line, and starting pumping of a second fluid from the second primary fluid source through the output line.
    Type: Grant
    Filed: February 1, 2018
    Date of Patent: May 28, 2019
    Assignee: Graco Minnesota Inc.
    Inventors: David L. Fehr, Dennis J. Van Keulen
  • Publication number: 20190118201
    Abstract: A method of actuating a double-action pump assembly with a reciprocating plunger includes signaling the reciprocating plunger to stop for a changeover period; while the pump is stopping, signaling the first inlet and outlet valves to close; while the first inlet and outlet valves are closing, signaling the second inlet and outlet valves to open, such that the second inlet and outlet valves begin to mechanically open at least a dwell period after the first inlet and outlet valves have entirely closed; and signaling the reciprocating plunger to begin moving while the second inlet and outlet valves are closing.
    Type: Application
    Filed: December 21, 2018
    Publication date: April 25, 2019
    Inventors: David L. Fehr, John R. Ingebrand, Jeffrey U. Shaffer
  • Patent number: 10195621
    Abstract: A method of actuating a double-action pump assembly with a reciprocating plunger includes signaling the reciprocating plunger to stop for a changeover period; while the pump is stopping, signaling the first inlet and outlet valves to close; while the first inlet and outlet valves are closing, signaling the second inlet and outlet valves to open, such that the second inlet and outlet valves begin to mechanically open at least a dwell period after the first inlet and outlet valves have entirely closed; and signaling the reciprocating plunger to begin moving while the second inlet and outlet valves are closing.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: February 5, 2019
    Assignee: Graco Minnesota Inc.
    Inventors: David L. Fehr, John R. Ingebrand, Jeffrey U. Shaffer
  • Patent number: 10195622
    Abstract: A control method for a two-component spray system having first and second pumps for separate fluid components includes registering a target spray pressure, registering a material-specific pressure factor margin, sensing an output pressure of the second pump, and identifying a failure condition in the event that the sensed output pressure remains further than the pressure factor margin from the target spray pressure for at least a threshold time.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: February 5, 2019
    Assignee: Graco Minnesota Inc.
    Inventors: David L. Fehr, John R. Ingebrand, Dennis J. Van Keulen
  • Publication number: 20180154388
    Abstract: A method for a system having a plurality of primary fluid sources and a fluid output with a common pump includes halting pumping of a first fluid, isolating the common pump from the fluid output and the primary fluid sources, connecting an inlet of the common pump to a solvent source and a compressed air source, and an outlet of the common pump to a waste fluid dump, filling the common pump with a first purge volume of solvent, cycling the common pump in a flush mode, operating the common pump in a timed flow mode, and connecting an inlet of the common pump to a second primary fluid source, and an outlet of the common pump to the output line, and starting pumping of a second fluid from the second primary fluid source through the output line.
    Type: Application
    Filed: February 1, 2018
    Publication date: June 7, 2018
    Inventors: David L. Fehr, Dennis J. Van Keulen
  • Patent number: 9901945
    Abstract: A method for a system having a plurality of primary fluid sources and a fluid output with a common pump includes halting pumping of a first fluid, isolating the common pump from the fluid output and the primary fluid sources, connecting an inlet of the common pump to a solvent source and an outlet of the common pump to a waste fluid dump, actuating the common pump first in a pumping mode, then in a recirculation mode, and then in a flush mode, connecting an inlet of the common pump to a second primary fluid source, and an outlet of the common pump to the output line, and starting pumping mode pumping of a second fluid from the second primary fluid source through the output line.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: February 27, 2018
    Assignee: Graco Minnesota Inc.
    Inventors: David L. Fehr, Dennis J. Van Keulen
  • Publication number: 20160167066
    Abstract: A control method for a two-component spray system having first and second pumps for separate fluid components includes registering a target spray pressure, registering a target primary-to-secondary spray component flow ratio, sensing an output pressure of the first pump, controlling the first pump to a first speed set via a proportional-integral-derivative loop using the sensed output pressure and the target spray pressure, and controlling the second pump to a second speed equal to the first speed multiplied by the target primary-to-secondary spray component flow ratio.
    Type: Application
    Filed: July 18, 2014
    Publication date: June 16, 2016
    Inventors: David L. Fehr, John R. Ingebrand, Jeffrey U. Shaffer
  • Publication number: 20160167076
    Abstract: A method for a system having a plurality of primary fluid sources and a fluid output with a common pump includes halting pumping of a first fluid, isolating the common pump from the fluid output and the primary fluid sources, connecting an inlet of the common pump to a solvent source and an outlet of the common pump to a waste fluid dump, actuating the common pump first in a pumping mode, then in a recirculation mode, and then in a flush mode, connecting an inlet of the common pump to a second primary fluid source, and an outlet of the common pump to the output line, and starting pumping mode pumping of a second fluid from the second primary fluid source through the output line.
    Type: Application
    Filed: July 18, 2014
    Publication date: June 16, 2016
    Inventors: David L. Fehr, Dennis J. Van Keulen
  • Publication number: 20160158784
    Abstract: A method of actuating a double-action pump assembly with a reciprocating plunger includes signaling the reciprocating plunger to stop for a changeover period; while the pump is stopping, signaling the first inlet and outlet valves to close; while the first inlet and outlet valves are closing, signaling the second inlet and outlet valves to open, such that the second inlet and outlet valves begin to mechanically open at least a dwell period after the first inlet and outlet valves have entirely closed; and signaling the reciprocating plunger to begin moving while the second inlet and outlet valves are closing.
    Type: Application
    Filed: July 18, 2014
    Publication date: June 9, 2016
    Inventors: David L. Fehr, John R. Ingebrand, Jeffrey U. Shaffer
  • Publication number: 20160153441
    Abstract: A control method for a two-component spray system having first and second pumps for separate fluid components includes registering a target spray pressure, registering a material-specific pressure factor margin, sensing an output pressure of the second pump, and identifying a failure condition in the event that the sensed output pressure remains further than the pressure factor margin from the target spray pressure for at least a threshold time.
    Type: Application
    Filed: July 18, 2014
    Publication date: June 2, 2016
    Applicant: GRACO MINNESOTA INC.
    Inventors: David L. Fehr, John R. Ingebrand, Dennis J. Van Keulen