Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 8161812 | High pressure fluid meter A high pressure rotary gas meter is described herein with an exchangeable cartridge which has a meter body surrounded by an open bracket. The meter body can have a chamber in fluid communication with an inlet and an outlet. An impeller can be located in the chamber ... | 04/24/2012 |
| 8082784 | Rotary meter flexible edge impeller assembly An assembly for use in a rotary positive displacement fluid meter having an inner body wall surface that includes a first impeller having an outer surface located within the rotary positive displacement fluid meter and adapted to be directly driven by a fluid flow. ... | 12/27/2011 |
| 8069719 | Gear flow meter with optical sensor Embodiments of the invention provide devices and methods for measuring fluid volume. Devices according to some embodiments include a chamber, having a pair of gears rotatably mounted therewithin. Fluid flow through the chamber causes rotation of the gears, such that... | 12/06/2011 |
| 7870785 | Positive displacement flowmeter A position displacement flowmeter having a pair of non-circular gears in a rolling contact on a pitch line without slippage. The positive displacement flowmeter comprises a casing and a pair of rotors provided in the casing and rotatable around its center axes. The ... | 01/18/2011 |
| 7523660 | Oval gear meter The invention relates on an oval gear meter for volume flow measurement comprising a housing with an oval gear chamber with a fluid inlet and a fluid outlet, a pair of oval gear wheels positioned in the chamber and together forming an intermeshing or non-intermeshin... | 04/28/2009 |
| 7278310 | Non-invasive measurement system A non-invasive piston-cylinder measurement system of a cylinder and a piston mounted for axial movement within the cylinder. The cylinder comprises a non-magnetic cylinder wall. A magnet is mounted within the piston. A plurality of magnetically activated switches, s... | 10/09/2007 |
| 7275417 | Fueling system vapor recovery and containment performance monitor and method of operation thereof A method and apparatus for monitoring and determining fuel vapor recovery performance is disclosed. The dispensing of liquid fuel into a tank by a conventional gas pump nozzle naturally displaces a mixture of air and fuel ullage vapor in the tank. These displaced va... | 10/02/2007 |
| 7228729 | Apparatus and method for testing fuel flow Apparatus for testing fuel flow in a return or returnless fuel system. The apparatus comprises a housing, a primary flow passage in the housing having an inlet for connection to the fuel system for receiving fuel pumped by the fuel pump, and an outlet adapted for co... | 06/12/2007 |
| 7171852 | Gas meter operation tracking assembly A tracking assembly and method for tracking the operation of a rotary gas meter that has a driven member includes a connecting member, a gear assembly and a mechanical counter. The connecting member is adapted to be coupled to the driven member. The gear assembly is... | 02/06/2007 |
| 7111520 | Increased sensitivity for liquid meter A lower cost meter comprised of an inner housing constructed out of a high permeable material surrounded by an outer housing constructed out of a lower cost, lower permeable material. A port is placed in the outer housing that runs down to the surface of the inner h... | 09/26/2006 |
| 7096728 | Polymer melt and elastomer extension fixture A system for making extensional measurements on a sample includes an armature, a motor drive shaft, a moveable cylinder, and a fixed cylinder. The motor drive shaft is attached to the armature. The moveable cylinder is mounted on the armature. The sample is stretche... | 08/29/2006 |
| 6923055 | Positive displacement flow meter method and apparatus A flow meter comprising a rotor assembly that is comprised of two rotors having axis of rotation offset from collinear where the two rotors define operating chambers that changing volume with respects to rotation and allow fluid to pass from an inlet port to an outl... | 08/02/2005 |
| 6796173 | Fuel flowmeter A fuel flowmeter has a flowmeter with rotating impellers with meshed lobes rotatable in partially cylindrical housings joined in a case having an inlet at one side and an outlet at an opposite side. Fuel moves in the inlet filling voids between lobes in both impelle... | 09/28/2004 |
| 6705161 | Positive displacement flow meter method and apparatus A flow meter comprising a rotor assembly that is comprised of two rotors having axis of rotation offset from collinear where the two rotors define operating chambers that changing volume with respects to rotation and allow fluid to pass from an inlet port to an outl... | 03/16/2004 |
| 6691569 | Dual windup drum extensional rheometer An extensional rheometer comprises a rotatable primary wind up drum and one or more secondary rotatable windup drums wherein a sample is attached to the primary windup drum and each secondary windup drum. Counter rotation of the primary windup drum and ea... | 02/17/2004 |
| 6658747 | Position sensor for a hydraulic actuator and hydraulic system using the same A hydraulic system includes position sensors that are provided together with solenoid valves in fluid passages extending between a working fluid source and hydraulic actuators. Each position sensor is comprised of two gears disposed in the fluid passage s... | 12/09/2003 |
| 6644947 | Wave tooth gears using identical non-circular conjugating pitch curves This invention is directed to a novel wave tooth gear having a non-circular pitch curve and uniform wave teeth to create a tighter seal between meshing gears. The non-circular wave tooth gear has a major axis and a minor axis disposed perpendicular to the... | 11/11/2003 |
| 6250151 | Fluid flow meter incorporating magnetic detector A device for measuring fluid volume output by a pump includes a meter housing having an inlet and an outlet through which the fluid flows. At least two inter-engaging screw spindles are rotatably mounted within the meter housing and are rotatable in respo... | 06/26/2001 |
| 6244844 | Fluid displacement apparatus with improved helical rotor structure A fluid displacement apparatus includes a housing defining a chamber therein having a first port and a second port. First and second helical rotors with opposing pitches are meshed within the chamber, in fluid communication with the first and second ports... | 06/12/2001 |
| 6196065 | Device metering and measuring quantities of liquid A device for metering and measuring quantities of liquid, in particular in a pump for liquid fuels, having a plurality of volume meters, an assigned valve being arranged upstream of each volume meter, and having a liquid supply which branches into individ... | 03/06/2001 |
| 6089102 | Apparatus for measuring the volume of flowing media and a corresponding method An apparatus and a method of measuring the volume of flowing media, especially of fuel, by means of a screw spindle volumeter, the method comprising the following steps: detecting the revolutions of a screw spindle by means of a sensor and producing pulse... | 07/18/2000 |
| 6048186 | Driving apparatus comprising modified gear shape elliptic gear wheels A pair of elliptic gear wheels to be installed in a metering chamber casing of positive displacement type flow meters and have a modified gear wheel and the change of gear form of an effective gearing pressure angle of an involute gear form side of long r... | 04/11/2000 |
| 5996405 | Measuring device provided with rotary pistons Measuring device for measuring the flow rate of a gas flow or liquid flow by means of a rotary piston device consisting of two rotary pistons which are placed in a pipe section and are mounted in such a way that they rotate about a rotary shaft, which rot... | 12/07/1999 |
| 5992230 | Dual rotor flow meter A positive displacement flow meter includes a pair of smooth oval shaped rotors mounted to a pair of spaced apart rotatable shafts contained within a sealed housing. The rotatable shafts penetrate the measuring chamber and have a pair of toothed, oval sha... | 11/30/1999 |
| 5970791 | Rotary meter having flow conditioning chambers for pressure pulse reduction An improved rotary fluid meter is provided having expansion chambers for conditioning pressure pulses that may occur in the flow of fluids. The pressure pulses, which inhibit the meter's ability to accurately measure, may originate from within a metering ... | 10/26/1999 |
| 5895847 | Apparatus for generating signal pulses The invention relates to an apparatus for generating signal pulses with a gear arrangement, which has at least two meshing gears and with a sensor means for detecting a gear rotation and for emitting signal pulses as a function on the detected gear rotati... | 04/20/1999 |
| 5704767 | Integral pump and flow meter device A pump housing is provided with a conduit extending through the housing between a pump inlet and pump outlet. A pump device is disposed within the housing and in communication with the conduit to pump fluid therethrough. A fluid flow meter also is dispose... | 01/06/1998 |
| 5627313 | Positive displacement volumetric measuring device The system has been innovated by means of ellipses that mesh tangentially with each other, given the importance of mixing accurate amounts of liquids, or merely controlling quantities entering or leaving a reservoir. The shape of the ellipses is noteworth... | 05/06/1997 |
| 5616862 | Volume meter A volume meter or indicator in a multipart casing with a measuring chamber containing two meshing gears. For avoiding pockets the casing parts are sealed with a flat gasket instead of O-rings or other sealing means which cause pockets. In addition, the ge... | 04/01/1997 |
| 5559288 | Volume sensor for liquids using toothed meter wheels A volume sensor for liquids comprising a measuring chamber in which toothed meter wheels mesh with one another and are mounted on stationary pivots. Flow paths are formed in at least one of the measuring-chamber end walls and are separated by a web in the... | 09/24/1996 |
| 5553493 | High resolution flowmeter with wear detection An apparatus for measuring volume flow through a gear-type flowmeter, having a magnetic sensor affixed to the flowmeter to detect incremental movement of the flowmeter teeth. The sensor is connected to an analog-to-digital converter and computer processor... | 09/10/1996 |
| 5447062 | Apparatus for measuring quantities of liquid in gasoline pumps of motor vehicle filling stations A flow meter includes a rotor housing having an inlet, an outlet, and a bore extending axially through the housing from the inlet to the outlet, and a screw spindle arrangement including at least two rotary helical worm bodies which are disposed in the bo... | 09/05/1995 |
| 5415041 | Double helical flowmeter A high volume, low RPM, low noise, low wear and long life flowmeter uses inter-engaging double helical four-lobe rotors. The meter is made with ball bearings or bearingless. The double helical nature of the teeth provides no axial loads and no side loads ... | 05/16/1995 |
| 5339685 | Positive-displacement fluid flow-measuring system A positive-displacement fluid flow measuring system, especially for hydrocarbon fuel dispensers. The measuring system comprises, in addition to a positive-displacement meter per se, a correction system for correcting the loss of head in the meter. The cor... | 08/23/1994 |
| 5325715 | Fluid flowmeter A fluid volumetric flowmeter has a wall plate forming a chamber and a fluid inlet, and a fluid outlet. Two rotors positioned within the chamber have intermeshing lobes and valleys for turning in the chamber as fluid flows from the inlet through the chambe... | 07/05/1994 |
| 5323651 | Oval gear flowmeter for small nominal diameters The present invention relates to a small nominal diameter oval gear flowmeter having curved swivel surfaces for automatic self-alignment of the oval gears about a longitudinal shaft axis to enhance measurement accuracy and facilitate restriction-free rota... | 06/28/1994 |
| 5275043 | Positive displacement flowmeter A positive displacement flowmeter is provided having a body structure defining a flowmeter measurement chamber within which is rotatably supported a large primary gear rotor and a small secondary gear rotor that have rotor teeth intermeshing with one anot... | 01/04/1994 |
| 5184519 | High resolution flow meter An improved resolution positive displacement flow meter of the type having a pair of meshed gears. A plurality of sensors are spaced to detect movement of the gear teeth as liquid flows through the flow meter. Where the gears each have n teeth and s senso... | 02/09/1993 |
| 5150612 | Dual revolving vane pump-motor-meter A positive displacement apparatus usable as a pump or motor or flowmeter comprises a first revolving vane rotatably disposed in a first cylindrical cavity wherein the edge of the first revolving vane sweeps on a circular cylindrical portion of the cylindr... | 09/29/1992 |
| 5058709 | Device for the dosing of lubricants In a device for the dosing of lubricants which comprises at least one manual throttling element limiting the volume flow and a flow metering device connected downstream of it, which contains at least one sensor element movable through the volume flow, a d... | 10/22/1991 |
