Patents by Inventor Gary D. Cohrs

Gary D. Cohrs 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: 5974858
    Abstract: A densimeter is provided that is mounted on the side of a conduit carrying a fluid flow. The densimeter consists of an inlet and an outlet scoop which are immersed into the fluid flow through the conduit. A portion of the fluid flow enters into the first scoop and is directed into the densimeter where the fluid's density is measured and then exits through the exit scoop back into the fluid flow in the conduit.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: November 2, 1999
    Assignee: Calibron Systems, Inc.
    Inventors: Edward E. Francisco, Jr., Gary D. Cohrs
  • Patent number: 5072416
    Abstract: A double cycle prover is used to calibrate meters which require long proving runs. A small volume or piston prover and a master flowmeter, are coupled in series with the meter under test, then the master flowmeter is calibrated against the small volume prover, and the meter under test is calibrated against the master flowmeter. A signal processor combines the proving cycles, to relate the small volume prover to the meter under test. A density meter is connected to the flow channel, if the meter under test is a mass flowmeter, and the signal processor uses the density measurement to relate the mass flow measurement of the meter under test with the volume flow measurement of the master flowmeter.
    Type: Grant
    Filed: March 19, 1990
    Date of Patent: December 10, 1991
    Assignee: Calibron Systems, Inc.
    Inventors: Edward E. Francisco, Jr., Gary D. Cohrs, Samuel H. Smith
  • Patent number: 5052212
    Abstract: A dynamic leak detector is connected to a fluid flowmeter prover. The prover has a measurement chamber with a fluid inlet and a fluid outlet and a barrier which moves axially through the chamber between the fluid inlet andc the fluid outlet. First and second spaced apart seals between the barrier and the chamber interior prevent fluid from passing through the barrier. The leak detector is connected to the space between the first and second seals and urges fluid to flow out through the seals into the chamber, while the prover is operating. If more than a threshold amount of fluid passes through the seals during a test run, the operator is alerted and the test run is rejected.
    Type: Grant
    Filed: October 18, 1989
    Date of Patent: October 1, 1991
    Assignee: Calibron Systems, Inc.
    Inventor: Gary D. Cohrs
  • Patent number: 5052211
    Abstract: A fluid flowmeter prover uses a measuring cylinder in series with a flowmeter to calibrate the flow meter. The cylinder has a piston which travels in synchronism with the fluid, the flow rate of which is to be measured. At the downstream end of the cylinder, a poppet valve connected to and within the piston opens to allow the fluid to pass through the piston. The poppet valve has a valve rod connected to a first coupling. A second coupling engages the first coupling and through a motor draws the valve and piston to the upstream end of the cylinder where they disengage, releasing the valve and allowing it to close for another run. The cycle repeats when the second coupling is driven down to reengage the first coupling.
    Type: Grant
    Filed: December 12, 1989
    Date of Patent: October 1, 1991
    Assignee: Calibron Systems, Inc.
    Inventors: Gary D. Cohrs, Edward E. Francisco, Jr.
  • Patent number: 4996869
    Abstract: A moveable fluid barrier (16) is driven from an upstream position to a downstream position through a measuring cylinder (18) connected fluidically in series with the flowmeter (22) under test to induce fluid flow therethrough at a flow rate related to the movement of the barrier. The response of the flowmeter is sensed during a plurality of time intervals as the barrier is driven through the conduit from the upstream position toward the downstream position in the course of a test run. The movement of the fluid barrier is also sensed (28) during these intervals. From the flowmeter response and the fluid barrier movement, a K-factor sample is determined for each interval. The K-factor samples are compared (12) with each other to selected a valid K-factor data point for the particular test run. Specifically, the criterion for determining a valid K-factor data point is the variation between K-factor samples under comparison.
    Type: Grant
    Filed: November 14, 1988
    Date of Patent: March 5, 1991
    Assignee: EG&G Flow Technology, Inc.
    Inventors: Gary D. Cohrs, Samuel H. Smith, Edward E. Francisco, Jr.
  • Patent number: 4794785
    Abstract: A fluid displacement measuring cylinder has near its ends, respectively, an inlet and an outlet. A fluid displacement measuring piston is adapted to travel through the measuring cylinder as a fluid barrier. A control piston having first and second sides is adapted to travel through the control cylinder as a fluid barrier. A rod connects the control piston only to the side of the measuring piston facing toward one end of the measuring cylinder. A gas pressurized plenum chamber is connected to the control cylinder so the force of the gas pressure urges the measuring piston toward the other end of the measuring cylinder. The movement of the measuring piston through the measuring cylinder is sensed and the movement of the control piston through the control cylinder is fluidically controlled. The pressure in the plenum chamber, which has a substantially larger volume than the control cylinder, is selected so as to cancel the force imbalance caused by the rod.
    Type: Grant
    Filed: August 14, 1986
    Date of Patent: January 3, 1989
    Assignee: Flow Technology, Inc.
    Inventors: Gary D. Cohrs, Ronald J. Jackson, Edward E. Francisco, Jr.
  • Patent number: 4766759
    Abstract: A mechanical displacement flowmeter calibrator has a first fluid line external of the measuring cylinder of the calibrator connected between the inlet and outlet thereof. A flowmeter that produces flow-representative pulses is connected in the fluid line. A rod is connected to a measuring piston adapted to travel through the measuring cylinder as a fluid barrier. The rod drives the measuring piston through the measuring cylinder at a predetermined, constant speed and thereby determines the flow rate of the calibration. The displacement of the measuring piston is sensed as it travels through the measuring cylinder during a test run, while the pulses produced by the flowmeter are counted during the time interval in which the piston displaces a given volume. The flowmeter is preferably connected in the fluid line at the pressure null point. First and second annular edge seals around the periphery of the measuring piston form an annular cavity into which pressurized fluid, preferably a lubricant, is injected.
    Type: Grant
    Filed: March 9, 1987
    Date of Patent: August 30, 1988
    Assignee: Calibron Systems, Inc.
    Inventors: Gary D. Cohrs, Edward E. Francisco, Jr.
  • Patent number: 4674317
    Abstract: A mechanical displacement flowmeter calibrator has a first fluid line external of the measuring cylinder of the calibrator connected between the inlet and outlet thereof. A flow meter that produces flow-representative pulses is connected in the fluid line. A rod is connected to a measuring piston adapted to travel through the measuring cylinder as a fluid barrier. The rod drives the measuring piston through the measuring cylinder at a predetermined, constant speed and thereby determines the flow rate of the calibration. The displacement of the measuring piston is sensed as it travels through the measuring cylinder during a test run, while the pulses produced by the flowmeter are counted during the time interval in which the piston displaces a given volume. The flowmeter is preferably connected in the fluid line at the pressure null point. First and second annular edge seals around the periphery of the measuring piston form an annular cavity into which pressurized fluid, preferably a lubricant, is injected.
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: June 23, 1987
    Assignee: Flow Technology
    Inventors: Gary D. Cohrs, Edward E. Francisco, Jr.
  • Patent number: 4627267
    Abstract: A mechanical displacement flowmeter calibrator has a first fluid line external of the measuring cylinder of the calibrator connected between the inlet and outlet thereof. A flowmeter that produces flow-representative pulses is connected in the fluid line. A rod is connected to a measuring piston adapted to travel through the measuring cylinder as a fluid barrier. The rod drives the measuring piston through the measuring cylinder at a predetermined, constant speed and thereby determines the flow rate of the calibration. The displacement of the measuring piston is sensed as it travels through the measuring cylinder during a test run, while the pulses produced by the flowmeter are counted during the time interval in which the piston displaces a given volume. The flowmeter is preferably connected in the fluid line at the pressure null point. First and second annular edge seals around the periphery of the measuring piston form an annular cavity into which pressurized fluid, preferably a lubricant, is injected.
    Type: Grant
    Filed: July 19, 1985
    Date of Patent: December 9, 1986
    Assignee: Flow Technology, Inc.
    Inventors: Gary D. Cohrs, Edward E. Francisco, Jr.
  • Patent number: 4102189
    Abstract: A turbine wheel is mounted for rotation in a cylindrical housing at the end of rod, the housing and rod pass through a sleeve to insert the turbine wheel in a line to intercept fluid flowing therethrough. The rotational position of the rod is controlled as it passes through the sleeve to align the turbine wheel with the direction of flow through the line. A pickoff coil senses the rotation of the turbine wheel. Responsive to the pickoff coil, the sleeve and the rod are rotated as a unit to reduce the fluid intercepted by the turbine wheel.
    Type: Grant
    Filed: June 20, 1977
    Date of Patent: July 25, 1978
    Assignee: Flow Technology, Inc.
    Inventor: Gary D. Cohrs