John Patrick Dilger, 601251 275Th St, Garwin, IA 50632

6345234, Feb 5, 2002

Nov 11, 1998

09/189671

John Patrick Dilger - Marshalltown IA
Ted D. Grabau - Marshalltown IA
Nile K. Dielschneider - Conrad IA
Meredith D. Miller - Marshalltown IA

Fisher Controls International, Inc. - Marshalltown IA

G01N 3100

702 24, 702 30, 73 2331

A system and method for collecting data relating to emissions from an emissions source is disclosed. The system comprises an accumulator adapted to receive emissions from the emissions source, a sensor in flow communication with an outlet of the accumulator for generating a signal indicative of a physical property of the emissions, and a sensor interface circuit receiving the signal and generating data relating to the emissions from the emissions source. A system and method for reducing emissions from an emissions source is also disclosed, including a microcontroller receiving data relating to the emissions from the emissions source and generating control signals for reducing the emissions.

6408674, Jun 25, 2002

Apr 7, 1999

09/287245

John Patrick Dilger - Marshalltown IA

Fisher Controls International - Austin TX

G01N 2100

73 102, 73 105, 73 119

A device for remotely calibrating leak sensors is disclosed. The leak sensor calibration device includes a reservoir for storing a fluid calibrant, a conduit in flow communication with the reservoir, an outlet nozzle, an air supply source, and a valve mechanism. A portion of the conduit defines a dosing chamber for storing a measured quantity of the calibrant, and the outlet nozzle is in flow communication with the dosing chamber. The air supply source is adapted to pressurize the measured quantity of calibrant stored in the dosing chamber. The valve mechanism is adapted to eject the measured quantity of calibrant stored in the dosing chamber to the atmosphere through the outlet nozzle.

6515474, Feb 4, 2003

Dec 3, 1999

09/454801

Nile K. Dielschneider - Conrad IA
John P. Dilger - Marshalltown IA
Donald P. Pepperling - Marshalltown IA

Fisher-Rosemount Systems, Inc. - Austin TX

G01B 714

32420724, 32420722

A displacement sensor includes a magnet assembly having a housing for mounting to one of first and second relatively moveable elements. A magnet assembly is mounted to one element and defines a longitudinal space having an axis along its length. The magnet assembly includes at least one magnet having a north and a south pole that supply fringing magnetic flux in the longitudinal space and a flux-shaping pole piece on each of the north and south poles. A magnetic field sensor assembly has a housing for mounting to the other of the first and second elements for movement along an axis in the space parallel to the magnet assembly. In one embodiment, each of the flux-shaping pole pieces has a pentagon shape in a plane of primary flux pattern, forming a first face confronting the longitudinal space between the first and second magnets. In another embodiment, the magnet is a cylindrical magnet adjacent the longitudinal space, and the first face of each flux-shaping pole piece is cylindrical and coaxial with the cylindrical magnet. Preferably, the pole piece has a frusto-conical face confronting the longitudinal space adjacent the cylindrical face.

6536469, Mar 25, 2003

Jan 16, 2001

09/761427

John P. Dilger - Marshalltown IA
Donald P. Pepperling - Marshalltown IA
Nile K. Dielschneider - Conrad IA
James C. Hawkins - Allen IA
David E. Woollums - Frisco IA

Fisher Controls International, Inc. - Clayton MO

F16K 3700

137554

A magnet assembly is disclosed for use with a magnetic flux sensor to provide a position sensor adapted to detect a position of a moveable member. The magnet assembly comprises a magnet housing defining an inner surface. A magnet is provided that is sized for insertion into the magnet housing and adapted for movement with the moveable member, the magnet having a north pole and a south pole, wherein the magnet generates a magnetic flux. A centering ring is positioned between the magnet and the magnet housing, the centering ring including a biased wall acting to center the magnet in the magnet housing.

6654470, Nov 25, 2003

Jul 13, 1999

09/352730

John P. Dilger - Marshalltown IA
Guojun Liu - Ames IA

Fisher-Rosemount Systems, Inc. - Austin TX

H04B 1500

381 941, 73 2406, 331 941

A sensor circuit for use in measuring concentrations of an analyte in a fluid is comprised of a BAW sensor, a voltage variable capacitor connected to the sensor, an input which supplies a bias warping dc voltage to the voltage variable capacitor, and a resonant oscillator circuit. The resonant oscillator circuit detects the fundamental frequency of the sensor and produces a resonant signal frequency. The bias warping dc voltage applied to the voltage variable capacitor warps the resonant frequency of the circuit away from inharmonic noise.

6796324, Sep 28, 2004

Nov 28, 2001

09/997028

John Patrick Dilger - Marshalltown IA
Jerry Marvin Ceaser - Newton IA

Fisher Controls International, LLC - St. Louis MO

G01M 318

137312, 73 46, 7386381, 7386473, 277320, 277512, 277513, 277522

A fugitive emission collection device for acquiring an atmosphere sample around a seal is provided. The emission collection device has a rigid member that forms a low impedance cavity shaped to overlay a seal. The emission collection device has a conduit with an inlet in fluid communications with the low impedance cavity and an outlet that can be connected to a chemical sensing system to analyze the atmosphere sample for emissions leaking from the seal.

6879936, Apr 12, 2005

Jan 9, 2002

10/042979

John P. Dilger - Marshalltown IA, US

Fisher Controls International LLC - St. Louis MO

G01N001/00

702183, 702 22, 702 23, 702 30, 702 31, 702 32, 702104, 702127

A chemical detection system performs controlled exposures to diagnose the pneumatic components and chemical sensors prior to measuring a chemical emission. A control module provides the system control and data processing to perform the diagnosis. The control module manipulates an emission sample retrieval system to provide precise exposure during the diagnostic routines. A sensor interface circuit interrogates the chemical sensors and stores the data for analysis. The chemical sensor exhibits predictable changes in response during predetermined exposure scenarios. By utilizing numerous time domain signal processing techniques, both system and sensor level fault conditions are determined.

2002015, Oct 31, 2002

Mar 22, 2002

10/104600

John Dilger - Marshalltown IA, US

G01N027/00

073/001020

A calibration system includes an acoustic wave gas sensor array, and a delivery device adapted to eject a measured quantity of a liquid calibrant to the gas sensor array. The delivery device includes a connector adapted for connection to an air supply source, a reservoir adapted to store a supply of the liquid material, an outlet arranged for placement adjacent to the gas sensor array, a dosing chamber sized to define and store a measured quantity of the calibrant, a conduit disposed between the dosing chamber and the reservoir and arranged to provide flow communication therebetween, a portion of the conduit arranged to be responsive to a pressure gradient within the dosing chamber over a predetermined time interval to thereby prevent flow from the dosing chamber toward the reservoir during the predetermined time period, and a valve mechanism adapted to apply the pressure gradient to the dosing chamber over the predetermined time interval.