Patents by Inventor Dean E. Evans

Dean E. Evans 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).

  • Variable-rate, digitally-controlled fluid metering device
    Patent number: 6293429
    Abstract: A variable-rate, digitally controlled fluid metering device having an electronically controlled 3-way valve, a fluid reservoir, a float valve, a check valve and a pressure relief valve that accurately delivers low flow volumes. The flow rate of the device is the product of reservoir volume and pulse rate when the cycle is long enough to fill and empty the reservoir and is a linear combination of cycle time when the cycle is short enough that the reservoir does not fill or empty completely. This device allows the use of large orifice emitters for delivering low flow rates of fluids, which allows the use of lower quality fluids and/or reduces filtration steps and clogging of emitters.
    Type: Grant
    Filed: August 7, 1998
    Date of Patent: September 25, 2001
    Assignee: The United States of America as represented by the Secretary of the Department of Agriculture
    Inventors: Edward John Sadler, Carl R. Camp, Dean E. Evans, Lonnie J. Usrey
  • VARIABLE-RATE, DIGITALLY-CONTROLLED FLUID METERING DEVICE
    Publication number: 20010001467
    Abstract: A variable-rate, digitally controlled fluid metering device having an electronically controlled 3-way valve, a fluid reservoir, a float valve, a check valve and a pressure relief valve that accurately delivers low flow volumes. The flow rate of the device is the product of reservoir volume and pulse rate when the cycle is long enough to fill and empty the reservoir and is a linear combination of cycle time when the cycle is short enough that the reservoir does not fill or empty completely. This device allows the use of large orifice emitters for delivering low flow rates of fluids, which allows the use of lower quality fluids and/or reduces filtration steps and clogging of emitters.
    Type: Application
    Filed: August 7, 1998
    Publication date: May 24, 2001
    Applicant: USAD-ARS-OTT
    Inventors: EDWARD JOHN SADLER, CARL R. CAMP, DEAN E. EVANS, LONNIE J. USREY