Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 7363824 | Flow sensor A flow sensor for flowing media with a cylindrical housing (2) and with a sensor element located in the housing (2), the housing (2) preferably having an outside thread (3) and being screwable into a union (4) of a pipe (5) ... | 04/29/2008 |
| 7314237 | Pipe joint assembly A pipe joint assembly including a transparent quill; an outer quill having at least a first view port, and having at least a first outwardly extending pipe coupling thread which extends longitudinally along and helically about the outer quill, the transparent quill ... | 01/01/2008 |
| 7130750 | Flow meter with magnetoresistive sensors and method of measuring flow A variable area flow meter has a magnet carried by a piston which is moved to a position representing fluid flow. An array of magnetoresistive bridge sensors adjacent the path of magnet movement senses the magnet position. The bridges are unbalanced by the magnet fi... | 10/31/2006 |
| 7121299 | Regulator valve with flow indicator for a hot-water heating system The valve includes an intake duct (13) for conveying water into the valve, an externally projecting tubular body (20) of a transparent with an internal cavity (21) and a flow indicator rod (40), slidable inside the valve, with a lower por... | 10/17/2006 |
| 6935190 | Flow rate measurement apparatus An apparatus for flow rate measurement includes a body having a chamber with an inlet and an outlet and a structure, buoyant in the presence of a fluid, disposed in the chamber. The structure moves to a position in the chamber in proportion to a flow rate of the flu... | 08/30/2005 |
| 6210565 | Hydraulic filter head-mounted flowmeter A device and method for monitoring a fluid characteristic, such as flowrate, of a fluid within a fluid circuit having a preexisting filter head. The device is installed on the filter head in place of the existing filter element. The apparatus includes a h... | 04/03/2001 |
| 6164141 | Gas delivery sensor and respiratory aid appliance comprising such a sensor A gas delivery sensor, of the type in which two upstream and downstream pressure pick-up conduits, which are each connected to a pressure sensor, open into a gas flow duct, in which a permeable element extends axially at least between opening ends of the ... | 12/26/2000 |
| 6121884 | Gas flow detector A gas flow detector (10) includes a casing (12) with an inlet (14) for connection to a gas source and an outlet (16) for connection to a gas using appliance. Between the inlet and outlet there is an internal chamber (18) which receives a sleeve (24). Gas ... | 09/19/2000 |
| 5827978 | Flow transducer A flow transducer includes a piston movable in a sleeve to vary the area of an orifice. The piston may move in either direction from a position in which flow is prevented. Movement in both directions is opposed by a spring. The piston assumes a unique pos... | 10/27/1998 |
| 5743270 | Resistive element for spirometer The present air tubes include a resistive element which is located in the hollow space of the tubular portion. This resistive element is adapted for providing a linear resistance-versus-pressure response is sized and adapted to cause a pressure difference... | 04/28/1998 |
| 5456107 | Modular gas flowmeter A high accuracy flowmeter for testing and calibrating flowmeters and the like, and more particularly a positive displacement flowmeter which may include a cylinder (12), a piston (10) within the cylinder (12) which makes a clearance seal with the inside o... | 10/10/1995 |
| 5440925 | Flow calibrator The invention relates to a high accuracy flowmeter for testing and calibrating flowmeters and the like, and more particularly to a positive displacement flowmeter which may include a cylinder (12), a piston (10) within the cylinder (12) which makes a clea... | 08/15/1995 |
| 5337617 | Gas flow meter A gas flow meter includes a cylinder closed at its upper end and slidably supported within a bearing ring. The cylinder side wall is provided with openings. A gas flow is directed into the interior of the cylinder which causes it to rise with respect to t... | 08/16/1994 |
| 5313844 | Flow transducer A flow transducer includes a piston movable in a sleeve to vary the area of an orifice. The piston may move in either direction from a position in which flow is prevented. Movement in both directions is opposed by a spring. The piston assumes a unique pos... | 05/24/1994 |
| 5131277 | Reverse osmosis system A reverse osmosis system includes a sediment filter which cleans feed water from a source and from which that feed water is fed to a reverse osmosis membrane filter. Permeate from the latter is fed to a bladder within a storage tank. Concentrate from the ... | 07/21/1992 |
| 5115684 | Flowmeter for measuring the rate of fluid flow in a conduit The flowmeter includes a piston that is biased by a spring to a neutral position within an encircling collar, and the piston is movable relative to the collar by and in the direction of the fluid flow to be measured. Movement of the piston relative to the... | 05/26/1992 |
| 5033644 | Precision dispensing of varying viscosity fluids in a prescribed mix ratio The flow rate of fluid components, typically water and syrup, is sensed by a flowmeter that is substantially insensitive to variations in fluid pressure and/or viscosity. A feedback circuit which may be either analog or digital permits the regulation of f... | 07/23/1991 |
| 5024105 | Viscosity-insensitive variable-area flowmeter The differential-pressure-sensing and variable-area-occluding functions of a variable-area flowmeter, or rotameter, are performed by separate, but mechanically connected, means. A housing defines a channel for flowing fluid from an upstream to a downstrea... | 06/18/1991 |
| 4937558 | Flow failure detector A device and system for detecting the existance of fluid flow from a fluid source to a pipeline includes a cylinder with an inlet at a first end and a lateral outlet. A piston in the cylinder is moveable from a no-flow position abutting the first end in w... | 06/26/1990 |
| 4905844 | Method for monitoring ranges of volumetric fluid flow A method for monitoring the existence or non-existence of a given range of volumetric fluid flows through an input channel by correlating the same to a range of sensitivity of a magnetic sensor to a pole of a magnetic armature in a valve housing. Through ... | 03/06/1990 |
| 4838093 | Flow meter and method of measuring flow The invention includes a wall member which defines an expandable volume having a fluid inlet and a fluid outlet. The expandable volume varies in size as a function of fluid flow rate, and the deformation of the wall member resulting therefrom provides an ... | 06/13/1989 |
| 4787253 | Electronic display flow meter A flow meter having electrical signal outputs and a digital display is described. A transducer uses a magnet inside the flow meter to position a ball on a resistor bar and a contact bar and, thus, generate a position signal. The position signal provides a... | 11/29/1988 |
| 4619146 | Flow meter A flow meter includes a piston having magnetic properties. The piston is located in a cylinder having an outlet slot. Fluid flow into the cylinder and out through the slot determines the position of the piston. The piston is preferably of a magnetic mater... | 10/28/1986 |
| 4567777 | Device for measuring the throughflow of liquids and gases Device for throughflow measurement of gases or liquids according to the suspension principle, with a suspension element in the housing and special design of the housing, the attached indicator device, and the switch, said switch being activated by the sus... | 02/04/1986 |
| 4528858 | Flow meter An improved flow meter has a vertical chamber of relatively constant cross-section. In this chamber a float resides having a corss-section only slightly less than the cross-section of the chamber. Fluid is introduced at the bottom of the chamber and flows... | 07/16/1985 |
| 4507976 | Flow meter with hall effect sensor and method A fluid flow meter comprising a fluid tight housing including an inlet and an outlet; a hollow liner mounted within the housing including at least one slot, the slot for receiving fluid from the inlet and communicating it to the outlet; a magnetic piston ... | 04/02/1985 |
| 4489614 | Flowmeter A flowmeter for measuring the flow rate of a liquid or gaseous media is disclosed. The flowmeter comprises a body portion including an inlet and an outlet. A fluid path extends between the inlet and the outlet. A core tube is disposed vertically within th... | 12/25/1984 |
| 4479377 | Method and apparatus for measuring gas flow A movable piston is arranged within an open-ended cylinder, the piston having a peripheral groove for receiving liquid mercury to create a sliding gas-tight seal between the piston and the cylinder. The cylinder wall is provided with a plurality of openin... | 10/30/1984 |
| 4466293 | Volume flow meter for a flowing medium A volume flow meter for the measurement of the flow quantity of a liquid, which meter comprises a cylindrical flow channel (3), which has an inlet point (10) and an outlet point (12) for passing the liquid to be measured through the measurement channel. I... | 08/21/1984 |
| 4459859 | Flowmeter There is provided a flowmeter comprising a vertically extending inlet chamber having an inlet opening at its lower end, a vertically extending outlet chamber horizontally spaced-apart from the inlet chamber and having an outlet opening at its lower end, a... | 07/17/1984 |
| 4434670 | Fluid flow meter A fluid flow meter is provided for indicating the fluid flow rate in two or more predetermined flow ranges. The flow meter comprises a housing having an inlet open to a cylindrical inlet chamber and an outlet open to a cylindrical outlet chamber. At least... | 03/06/1984 |
| 4368646 | Flow meter for liquid or gaseous media A flow-through meter for liquid or gaseous media including a housing through which the medium flows. A floating body is disposed within the housing for movement under the influence of a lifting force produced by an increased flow of the medium through the... | 01/18/1983 |
| 4361051 | Flowmeter An improved flowmeter is disclosed for measuring the flow rate of a fluid such as a gas or a liquid. The flowmeter comprises a body portion including a fluid inlet and a fluid outlet. A core tube is vertically disposed within the body portion to be in flu... | 11/30/1982 |
| 4350050 | Flow transducer A fluid flow sensor includes a housing defining a flow path for fluid flow therethrough. A valve member slidably engages the housing and moves with respect to a fixed cylindrical metering member in response to fluid flow through the flow path. A spring bi... | 09/21/1982 |
| 4315436 | Flow-rate transducer with electrical output The invention in a preferred form contemplates a valve-like structure adapted for series-connection in a pipe or other conduit line and having a valve member which is caused, within the constraint of a rectilineal guide, to change its longitudinal positio... | 02/16/1982 |
| 4304136 | Electrical transducer responsive to fluid flow The invention in a preferred form contemplates a valve-like structure adapted for series-connection in a pipe or other conduit line and having a valve member which is caused, within the constraint of a rectilineal guide, to change its longitudinal positio... | 12/08/1981 |
| 4300402 | Flow measuring needle and orifice for flow meter A remote volume flow meter is disclosed in which a variable density optical filter attached to a moving diaphragm indicates flow by filter position. The diaphragm has a hole, which hole travels along a needle. The needle is mounted to the housing via a ne... | 11/17/1981 |
| 4194394 | Flow meter A flow meter comprises a housing defining a fluid inlet passage and a fluid outlet passage; a piston defining a jacket surface and a base surface is arranged in the housing for reciprocating movement between the two passages; a biasing spring urges the pi... | 03/25/1980 |
| 4122863 | Differential pressure overflow valve A differential pressure overflow valve has a housing with a differential pressure indicator therein consisting of a cylinder containing a piston moving against the force of a spring; the piston is spaced from said cylinder to provide an annular gap. The h... | 10/31/1978 |
| 4122839 | Apparatus for the determination of respiratory passageway resistance An apparatus for the determination of the respiratory passageways resistance, including a flow resistance in the breathing or respiratory flow passageway, whose resistance value is periodically varied by a frequency which lies above the breathing frequenc... | 10/31/1978 |
