Assignee: Fisher Controls International, Inc.

Location: Clayton, MO
No. of patents: 126

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Number	Title	Issue Date
6668665	Gas level monitoring system and gas flow rate sensor used therein An in-line gas flow rate sensor includes a movable flow orifice and a fixed flow restrictor adjacent the flow orifice for changing the gas flow through the flow orifice. The flow orifice and the flow restrictor are formed so that each uniform increment of...	12/30/2003
6644332	Method and apparatus for multiple-input-multiple-output control of a valve/actuator plant A method and apparatus for controlling a valve/actuator plant by generating a plurality of independent correcting control signals each responsive to a plurality of respective input signals and at least one of these input signals being the set point signal...	11/11/2003
6536469	Self-centering magnet assembly for use in a linear travel measurement device 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...	03/25/2003
6466893	Statistical determination of estimates of process control loop parameters A method and apparatus statistically determines estimates of one or more process control loop parameters, such as bearing friction, seal friction, total friction, dead band, dead time, oscillation, shaft windup or backlash associated with a device or a co...	10/15/2002
6441744	Regulator diagnostics system and method Apparatus for performing diagnostics through a regulator is disclosed. The pressure regulator is disposed in a fluid flow passage and has a throttling element moveable in the flow passage. A stem is attached to the throttling element. The apparatus includ...	08/27/2002
6382253	Fluid pressure reduction device with integral guides A fluid pressure reduction device for use with a fluid valve control member movable through the device. The pressure reduction device is formed of a plurality of stacked disks having an outer perimeter and an inner perimeter defined by a hollow center ali...	05/07/2002
6382226	Method for detecting broken valve stem A method for providing an indication and alarm of a possible failure in a fluid control valve stem, plug or seat in a process control system having a microprocessor based valve positioner. The drive pressure, drive signal and valve position feedback are m...	05/07/2002
6377859	Maintenance interface device for a use in a process control network A maintenance interface device for use in a digital, loop-powered process control network includes an interface to either a two-wire input/output port of a field device or to a two-wire communication media, a control logic for determining a simple status ...	04/23/2002
6371162	Electric actuator for fluid control valves An electro-mechanical actuator for operating a fluid control valve and controlling the operation of one or more field instruments, including other valve actuators. An electro-mechanical actuator has a drive unit and an electric motor driving the drive uni...	04/16/2002
6371156	No-bleed pilot for pressure regulating valve A control valve assembly including a no-bleed pilot valve is disclosed. The pilot valve includes a pressure responsive valve adapted to move in connection with a control parameter, such as downstream fluid pressure. The pressure responsive valve selective...	04/16/2002
6285966	Function block apparatus for viewing data in a process control system The present invention is directed to a method of and a device for monitoring, from a central location, the current operating conditions (such as values of process parameters) in a process control network having distributed control functions. In one embodi...	09/04/2001
6244297	Fluid pressure reduction device A multi-plate, anti-cavitation fluid pressure reduction device includes a stack of annular plates having a hollow center, a fluid inlet at an inner perimeter thereof and a fluid outlet at an outer perimeter thereof. Selected ones of the plates each define...	06/12/2001
6213150	Fluid pressure reduction disks with taper nut retention device A taper nut retention device mechanically fastens a plurality of pressure reduction disks. A cage end member at one end of the stacked disks has a series of counterbores, each aligned with respective mounting holes in each disk. A second cage end member a...	04/10/2001
6192321	Method of and apparatus for deterministically obtaining measurements A diagnostic test unit for deterministically measuring one or more parameters, such as dead band, dead time, response time, gain, or overshoot, of a process control device that is connected in a process control loop during operation of a process includes ...	02/20/2001
6192281	Network accessible interface for a process control network An interface between a remote communications network and a process control system includes a storage device, a communication software stack and a user software layer. The user software layer enables interfacing between the remote communications network an...	02/20/2001
6186167	Emergency shutdown test system An emergency shutdown system for a process control system includes an emergency shutdown (ESD) valve and an associated valve actuator. An emergency shutdown (ESD) controller provides output signals to the ESD valve in the event of a failure in the process...	02/13/2001
6178997	Intelligent pressure regulator An intelligent pressure regulator for maintaining a fluid in a process at a predetermined pressure includes an electronic controller which enhances regulator performance and provides self-diagnostics and communications capabilities. The electronic control...	01/30/2001
6170517	Replaceable flow-control assembly for use in a fluid flow line A single-piece flow-control assembly is configured to be disposed within a pit assembly in a manner which allows the flow-control assembly to be easily and quickly removed and replaced. The flow-control assembly includes one or more regulators rigidly con...	01/09/2001
6128541	Optimal auto-tuner for use in a process control network A device and method that automatically tune a valve controller coupled to a process control loop generate a plurality of sets of tuning parameters for use by the controller, deliver a test signal, such as a blocked sinusoidal signal, to the controller to ...	10/03/2000
6095196	Tortuous path fluid pressure reduction device A fluid pressure reduction device with tortuous flow paths in stacked disks. The fluid flow outlets are maintained independent by directed flow paths to avoid flow collisions in the exiting flow streams. A flow straightening section includes an inwardly t...	08/01/2000
6088665	Schematic generator for use in a process control network having distributed control functions A schematic generator for use in a process control network, in which control functions are implemented by field devices interconnected at various and distributed locations on a bus, polls each of the field devices to retrieve information pertaining to the...	07/11/2000
6076799	Rotary valve actuator and linkage A rotary valve actuator and linkage include an actuator having a tubular housing with end caps and a piston that is moved by fluid pressure against a compression spring. A rolling diaphragm is used to bias the piston. A pair of ports are provided on oppos...	06/20/2000
6056008	Intelligent pressure regulator An intelligent pressure regulator for maintaining a fluid in a process at a predetermined pressure includes an electronic controller which enhances regulator performance and provides self-diagnostics and communications capabilities. The electronic control...	05/02/2000
6047222	Process control network with redundant field devices and buses Functional elements within a two-wire, loop-powered, two-way digital communications environment are interconnected using selective redundant connections and selective redundant functional elements. The redundant functional elements and redundant connectio...	04/04/2000
6044305	Method and apparatus for debugging and tuning a process control network having distributed control functions A system and method for debugging and tuning a process control network having distributed control functions implemented by a set of field devices communicatively linked over a bus includes an operational scheduler that schedules the execution of each of a...	03/28/2000
6035878	Diagnostic device and method for pressure regulator A diagnostic device and method for an intelligent pressure regulator which maintains a fluid in a process at a predetermined pressure. The regulator includes an electronic controller which enhances regulator performance and provides self-diagnostics and c...	03/14/2000
6026859	Fluid pressure reduction device with linear flow characteristic A fluid pressure reduction device with stacked disks. Flow disks with inlet stage slots and outlet stage slots alternate with plenum disks having plenums and bypass slots. The bypass slots are aligned with the inlet stage slots so the flow capacity increa...	02/22/2000
6024125	Rotary valve A rotary valve provides a casing have an inlet and an outlet and a shaft mounted plug that selectively covers the inlet. A seat ring having an inner seating shoulder that is eccentric relative to the body bore of the inlet is provided. The seat ring can b...	02/15/2000
6026352	Local device and process diagnostics in a process control network having distributed control functions A field device for use in a process control network having a plurality of devices communicatively coupled by a two-wire, all-digital communication bus includes a connector that connects the field device to the two-wire, all-digital bus to enable all-digit...	02/15/2000
6023763	Method of and apparatus for protecting and upgrading software using a removable hardlock A software protection method and apparatus uses a removable hardlock to prevent the unauthorized installation and/or use of a licensed software program. The removable hardlock, when supplied to a user, stores an access variable indicating the number of li...	02/08/2000
6014612	Remote diagnostics in a process control network having distributed control functions A diagnostic system is adapted to perform device and process diagnostics in a process control network having a plurality of process control devices communicatively linked over a bus, wherein each of the devices is capable of preforming a process control f...	01/11/2000
6003551	Bidirectional fluid control valve A bidirectional flow fluid control valve having increased flow capacity in a flow down condition, a flow up condition or, preferably, in both flow conditions. The valve has a curved surface on the top portion of the valve plug or on the inner annular surf...	12/21/1999
6000675	Tension-spring return rotary valve actuator A rotary valve actuator with movable actuator linkage maintained in a constant "pull-pull" tension, includes a sliding canister, rotatable lever, and a return spring substantially aligned in-line with each other. The linear motion of the canister in respo...	12/14/1999
5996617	Low pressure regulator A two stage gas pressure regulator with a body housing having a gas inlet and a gas outlet, and a common interior wall dividing the body housing into two chambers forming two pressure reducing stages. Respective intersecting fluid passageways through the ...	12/07/1999
5988205	Rotary valve actuator with zero lost motion universal connection A rotary valve actuator with movable actuator linkage maintained in a constant "pull-pull" tension, includes a sliding canister, rotatable lever, and a return spring substantially aligned in-line with each other. The linear motion of the canister in respo...	11/23/1999
5979864	Double convoluted pliable pressure conversion unit A rotary valve actuator with movable actuator linkage maintained in a constant "pull-pull" tension, includes a sliding canister, rotatable lever, and a return spring substantially aligned in-line with each other. The linear motion of the canister in respo...	11/09/1999
5975487	Rotary valve actuator with high-low-high torque linkage A rotary valve actuator for fluid control valves having improved actuator linkage matching the torque requirements of most rotary shaft valves. A link member is pivotally interconnected to a linear movable actuating member and to a rotatable lever. The li...	11/02/1999
5974855	Electro-pneumatic converter calibration A temperature compensation method for a microprocessor based electro-pneumatic converter device including an initial calibration sequence, a compensation sequence, and an operation sequence. Linearization of an electro-pneumatic positioner including the s...	11/02/1999
5970778	Thermally activated calibration system for chemical sensors A device for remotely calibrating leak sensors. A supply of liquid analyte calibrant is stored in a reservoir, and is communicated to an outlet nozzle by a conduit having a throughbore. The conduit terminates in an outlet nozzle, and portion of the condui...	10/26/1999
5970430	Local device and process diagnostics in a process control network having distributed control functions A field device for use in a process control network having a plurality of devices communicatively coupled by a two-wire, all-digital communication bus includes a connector that connects the field device to the two-wire, all-digital bus to enable all-digit...	10/19/1999

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Assignee: Fisher Controls International, Inc.