Patents by Inventor Jeffrey U. Shaffer

Jeffrey U. Shaffer 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).

  • Pump changeover algorithm for spray system
    Patent number: 11148152
    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: December 21, 2018
    Date of Patent: October 19, 2021
    Assignee: Graco Minnesota Inc.
    Inventors: David L. Fehr, John R. Ingebrand, Jeffrey U. Shaffer
  • PUMP CHANGEOVER ALGORITHM FOR SPRAY SYSTEM
    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
  • Pump changeover algorithm for spray system
    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
  • SPRAY SYSTEM PRESSURE AND RATIO CONTROL
    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
  • PUMP CHANGEOVER ALGORITHM FOR SPRAY SYSTEM
    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