Class 73/514.08 - Magnetic fluid

Subclass of Class 73 - Measuring and testing
Definition: Subject matter wherein the fluid support comprises a liquid
No. of patents: 38
Last issue date: 11/20/2007

Number	Title	Issue Date
7296469	Magnetofluidic accelerometer with active suspension A method of measuring acceleration includes suspending an inertial body using a magnetic fluid; generating a magnetic field within the magnetic fluid; modulating the magnetic field to counteract a change in position of the inertial body relative to sources of the ma...	11/20/2007
7295184	Computer input device A computer input device includes a magnetized fluid and an inertial body within the magnetized fluid. A signal converter provides angular acceleration information based on behavior of the inertial body. The computer input device can be attached to a Virtual Reality ...	11/13/2007
7292223	Location tracking device A location tracking device utilizing an acceleration sensor is described. The acceleration sensor includes an inertial body in magnetic fluid that is contained in a closed volume vessel. The tracking device may be used for tracking objects, people, animals, and the ...	11/06/2007
7291780	Transducer for converting between mechanical vibration and electrical signal The present invention provides a transducer for converting between mechanical vibration and electrical signal, the transducer comprising a housing enclosing a substantially cylindrical permanent magnet and a coil, the magnet having a side-to-side polar orientation. ...	11/06/2007
7288860	Magnetic transducer with ferrofluid end bearings An electrical generator includes one or more magnets that move relative to one or more conductors to generate an electrical signal in each conductor. Each magnet has ferrofluid bearings in the vicinity of its opposite ends to provide a low friction interface between...	10/30/2007
7222433	Electromagnetic inclinometer An angle sensor comprising a housing (1) having horizontal and vertical axes, which housing is adapted to receive a magnetic core (5) such that the core remains in substantially the same plane, e.g. by floating on a liquid (4). The core is provi...	05/29/2007
7219562	Angle sensor The invention provides an angular position sensor (1) comprising two magnets (32, 33) attached to the inside face of a rotor (31) for generating a magnetic field (50) and a magnetism detection device (43) disposed in the magnetic f...	05/22/2007
7213349	Heat recovery system for clothes dryer While venting clothes dryer heat outside may be acceptable during the summer months, it is desirable to reuse such heat once the outside temperature starts to fall. The disclosed heat recovery unit for a clothes dryer works towards meeting this need. The heat recove...	05/08/2007
7191652	Magnetofluidic accelerometer with partial filling of cavity with magnetic fluid A sensor includes a housing and a magnetic fluid within the housing that incompletely fills the housing. An inertial body is in contact with the magnetic fluid. Displacement of the inertial body relative to the magnetic fluid is indicative of acceleration on the hou...	03/20/2007
7178399	Housing for magnetofluidic accelerometer A housing for a magnetofluidic sensor where the sensor has a plurality of drive magnet assemblies, magnetic fluid and an inertial body. The housing has a plurality of ports for securing respective drive magnet assemblies, such that a portion of each drive magnet ass...	02/20/2007
7143648	Magnetofluidic accelerometer with capacitive sensing of inertial body position An accelerometer includes an inertial body; a magnetized fluid holding the inertial body in suspension; and a plurality of capacitive elements, each forming a capacitor with the inertial body. A displacement of the inertial body produces a change of capacitance of t...	12/05/2006
7061469	Method of data input into a computer A computer input device and method used to input coordinates and three-dimensional graphical information into a computer. The device includes an acceleration sensor that has a fixed volume vessel containing a magnetic fluid. A non-magnetic inertial body is located i...	06/13/2006
7009310	Autonomous power source An autonomous power source comprises a power harvester mounted on a movable structure. The power harvester includes a coil, a magnet, and a low-friction ferrofluidic bearing in contact with the magnet, arranged such that the magnet and coil move with respect to each...	03/07/2006
6842671	Systems and methods for controlling handling characteristics of a tire One embodiment of the present invention relates to systems and methods for controlling handling characteristics of a tire. Another embodiment of the present invention relates to a tire having controllable handling characteristics. ...	01/11/2005
6628017	Ferrofluidic, electromagnetic power supply A ferrofluidic electromagnetic power supply firmly attached to an agitating object, such as the interior of a vehicular tire generates electric current in an electrical coil deposited between and firmly attached to an hermetically sealed housing made of n...	09/30/2003
6504271	Ferrofluidic, electromagnetic power generator A ferrofluidic electromagnetic power generator installed within a rotating object, such as the interior of a vehicular tire generates electric current in an electrical coil wound about an elongated, hermetically sealed housing made of non-magnetic materia...	01/07/2003
6466200	Computer input device A computer input device used to input coordinates and three-dimensional graphical information into a computer. The device includes an acceleration sensor that has a fixed volume vessel containing a magnetic fluid. A non-magnetic inertial body is located i...	10/15/2002
6374673	Velocity sensor A velocity sensor is disclosed comprising a housing, a ferromagnetic fluid which substantially fills the housing, and a magnetic proof mass suspended in the ferromagnetic fluid. The magnetic proof mass has a cylindrical center portion and end portions whi...	04/23/2002
6220095	Sensor for measuring yaw, pitch or roll movements A sensor for measurement of yawing motion, pitching or rolling motion, particularly as suited for use in motor vehicle control systems, contains an annular hollow object (1, 2, 4) in which a magnetic fluid (MF) is located. The magnetic fluid is set into r...	04/24/2001
6062081	Extended range accelerometer A low noise, extended dynamic range accelerometer useful for sensitive seismic observations. The accelerometer's extended range is obtained by utilizing a single opposing magnetic field to non-linearly oppose movement of a magnetic proof mass. The acceler...	05/16/2000
5908987	Sensor employing a sliding ferrofluid mass in a coated, non-wetting, housing A ferrofluid sensor assembly includes a closed housing containing a movable inductance core material that is isolated from the inner walls of the housing by an isolating material. The isolating material forms a layer between the inductance core material a...	06/01/1999
5780741	Sensor employing a sliding magnet suspended on ferrofluid A ferrofluid sensor assembly includes a permanent magnet which is supported in a hermetically-sealed housing by ferrofluid rings at each end of the magnet. However, the housing is large enough that the ferrofluid rings do not seal the end of the magnet ag...	07/14/1998
5756896	Extended range accelerometer A low noise extended dynamic range accelerometer useful for sensitive seismic observations. The accelerometer's extended range is obtained by utilizing fixed end magnets which non-linearly oppose movement of the magnetic proof mass. Additionally, an alumi...	05/26/1998
5679973	Lateral hall element A lateral Hall element includes a substrate, a first-conductivity type active layer formed on the substrate, a first second-conductivity type semiconductor layer formed to surround the first-conductivity type active layer and formed to a depth to reach th...	10/21/1997
5572058	Hall effect device formed in an epitaxial layer of silicon for sensing magnetic fields parallel to the epitaxial layer A vertical Hall element is formed within the epitaxial layer of a semiconductor and isolated from other components by a P type isolation diffusion. A position defining diffusion is used to accurately locate a plurality of openings within the position defi...	11/05/1996
5092171	Acceleration sensor with differential capacitance In an acceleration sensor, in particular for automobiles, at least two electrodes which are surrounded by a dielectric are arranged, substantially parallel to each other, in a housing and immersed over part of their length in an electrically conductive li...	03/03/1992
5007292	Multicomponent transducer The multicomponent transducer of the present invention comprises a housing interior surfaces forming an enclosed cavity and a single inertial mass immersed in a magnetic fluid contained therein. The inertial mass is levitated in the magnetic fluid by mean...	04/16/1991
4991438	Magnetic fluid rebalance accelerometers An accelerometer comprises a housing defining a chamber, a magnetizable fluid within the chamber, an electrically conductive, hollow cylindrical proof mass suspended within the chamber so as to be displaceble from a null position along a displacement axis...	02/12/1991
4984463	Two-dimensional acceleration sensor An acceleration sensor for detecting an acceleration in a plane, and having a housing, and a disk magnet arranged in a magnetic fludi stored in the housing. The movement of disk magnet is limited, i.e., a translational movement or rotational movement ther...	01/15/1991
4922753	Acceleration sensor An acceleration sensor including a magnetic fluid, a permanent magnet emplaced movably in the magnetic fluid, a nonmagnetic case, in which case the magnetic fluid and the permanent magnet are sealed and from which case air is substantially excluded, the s...	05/08/1990
4905517	Multicomponent transducer The multicomponent transducer of the present invention comprises a housing having interior surfaces forming an enclosed cavity and a single inertial mass immersed in a magnetic fluid contained therein. The inertial mass is levitated in the magnetic fluid ...	03/06/1990
4845988	Accelerometer having a permanent magnet with non-magnetic end members An accelerometer has a housing defining a chamber, and a magnetizable fluid 11 within the chamber. A permanent magnet is magnetically suspended within the chamber by the magnetizable fluid with its poles oriented along a displacement axis so as to be disp...	07/11/1989
4843877	Acceleration sensor An acceleration sensor comprises a case having defined therein at least one accommodating chamber. At least one magnetic ball is accommodated in the accommodating chamber with a radial play left between the wall surface of the accommodating chamber and th...	07/04/1989
4706498	Apparatus and method for measuring movement An accelerometer comprising a ferrofluid coated permanent magnet as a proof mass mounted for substantially friction-free movement in a hollow vessel on which vessel are mounted three coils that are used with an electrical circuit to detect and measure mov...	11/17/1987
4648273	Force responsive device A device is provided for detecting the influence of a gravitational forceon a body due to changes in a freefall state. The device includes a spherical housing, and a flow medium is contained in, and is adapted to travel about and undergo flow in the housi...	03/10/1987
4192189	Rate sensor A rate sensor is disclosd for use in applications requiring high reliability such as in aircraft or tank gun stabilization systems. The rate sensor consists of a sensor rotor supported within a volume of magnetic fluid contained in a sensor housing to whi...	03/11/1980
4047439	Magnetic liquid supported linear accelerometer A linear accelerometer comprises a proof mass in the form of a permanent bar magnet located in a tube containing a magnetic fluid such as a liquid with particles of magnetic material suspended therein. A servo circuit responsive to A.C. energized sensing ...	09/13/1977
4043204	Magnetic fluid bearing accelerometer An accelerometer employing a magnetic fluid bearing which permits movement f a magnetic cylinder along a designated sensitive axis. The device is used to measure acceleration in such applications as inertial platform leveling, thrust termination, and inert...	08/23/1977

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Class 73/514.08 - Magnetic fluid