Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 8008822 | Electrical generator arrangement In some circumstances such as with regard to contra-rotating turbo prop arrangements in aircraft it is desirable to vary the pitch of the blades and/or provide de-icing facilities. Advantageously, these blade pitch and de-icing facilities could be provided through e... | 08/30/2011 |
| 7994673 | Generator A stator 60 is rotated in a direction opposite to that of a rotor 20 to improve output of a generator 9. A stator 60 is rotationally fixed to a main shaft 10. A rotor is fixed to the main shaft rotated by outer force. A main gear | 08/09/2011 |
| 7347294 | Power system for electrically powered land vehicle The power system for an electrically powered land vehicle extracts electrons from ambient air to generate adequate electrical power to operate the land vehicle electrical energy production and propulsion system. The extracted electrons generate enough electrical pow... | 03/25/2008 |
| 7262533 | Energy transfer apparatus A motor and a generator both comprising a rotor and a stator, wherein said rotor and said stator of both said motor and said generator can rotate about a common axis, and wherein both said stators are coupled, and both said rotors are coupled, for one to induce rota... | 08/28/2007 |
| 7230363 | Low profile generator configuration One embodiment of the invention relates to a low profile electric generator having a short axial length. A cylindrical rotor body defines an interior cavity and is coupled to a driveshaft along the axis of the cylindrical body. A first rotor assembly is coupled to t... | 06/12/2007 |
| 7211905 | Vehicle-mounted generator A vehicle-mounted generator is powered by relative wind produced by the combination of ambient wind and motion of the vehicle, or by movement of water when mounted on the hull of a water-borne vehicle. A rigid cylindrical housing forms an enclosed interior chamber. ... | 05/01/2007 |
| 7202639 | Apparatus for determining wear in the frictional components of an alternator An apparatus for determining wear in the frictional components of an alternator. Such an apparatus may comprise circuitry configured to count voltage peaks generated by the automotive alternator; circuitry configured to compare the counted voltage peaks against a pr... | 04/10/2007 |
| 7173356 | Independent direct drive for paper processing machines The present invention provides an electric drive, including a stator (4) and a rotor (3), for a paper processing machine, in particular a printing press having at least two rotary subassemblies (1, 2), the stator (4) and the rotor (3 | 02/06/2007 |
| 7118506 | Actuator for active front steering system A active steering apparatus includes a housing, an input shaft, an output shaft, and an electrical motor. The electric motor has a stator fixed to the housing and a rotor. A first gear set interconnects the input shaft and the output shaft and includes a sun gear fi... | 10/10/2006 |
| 7075204 | Threaded inner sleeve for generator magnet An inner sleeve, having threads on each end, is formed on a motor or generator rotor. A pair of stub shafts are threadably attached to the inner sleeve at each end and a magnet is placed in between. The stub shafts are turned on the inner sleeve to bring them togeth... | 07/11/2006 |
| 6949854 | Method and apparatus for a continuously variable-ratio transmission A method and apparatus for providing a continuously variable transmission (CVT) is described. The CVT comprises permanent magnets to couple power, a coefficient of coupling controlled by an electronic servo control loop. Wherein torque multiplication is achieved by ... | 09/27/2005 |
| 6930426 | Alternator stator having a multiple filar construction to improve convective cooling A stator for a dynamoelectric machine improves the cooling of the stator winding without increasing the size of the stator winding or the entire stator. The stator is of a unique construction wherein the size, and more specifically the cross sectional area or volume... | 08/16/2005 |
| 6914362 | Construction and mode of operation of opposite statorless electronically switched motors The invention relates to the construction and a mode of operation of statorless electronically switched DC motors that have two freely turning rotors. The invention also relates to embodiments of the invention regarding the bearings, the circuit design and the mode ... | 07/05/2005 |
| 6710492 | Concentrically arranged single stator dual rotor motor/generator The motor/generator according to this invention is provided with a first rotor (23), a second rotor (21) and a stator (22) provided with a plurality of stator coils (1-6). The first rotor (23) is provided with magnetic poles by a m... | 03/23/2004 |
| 6493924 | Method for enabling a high torque/high speed brushless DC motor A high torque/high speed brushless DC motor system for controlling both the speed and torque of the motor including a rotor and a stator, the stator of the motor including a first, second and third winding. The system further includes means for sensing th... | 12/17/2002 |
| 6433451 | Method and electric motor with rotational stator An electric composite rotating machine haveing two rotors, capable of developing mechanical power and of runing on two rotational direction at selfadjutable speeds, of differential type, with 40% increase of output, doubling the torque at 30% reduction of... | 08/13/2002 |
| 6304017 | Counter rotating nested cylinders in electrical machinery The nested magic cylinders are rotatable and coaxially arranged so that the bore of the inner cylinder provides a central working space. The predetermined magnetic orientation of each cylinder's sections is arranged to create a relatively strong and unifo... | 10/16/2001 |
| 6118202 | High-efficiency inductor-alternator An inductor-alternator provides highly efficient conversion between mechanical and electrical energy. The inductor-alternator produces increased output by providing armature coils in a single air gap formed between two halves of a toothed rotor. In prefer... | 09/12/2000 |
| 6072258 | Permanent magnet coupler with adjustable air gaps A cage carrying two axially adjustable conductors is mounted on one shaft and a rotor is mounted on a second coaxial shaft to occupy a position between the conductors. Permanent magnets on the rotor have poles spaced by air gaps from the conductors. The a... | 06/06/2000 |
| 6005358 | Drive system for electric vehicles A dual-rotor electric motor (1), having an outer rotor (3) and an inner rotor (4), drives a first drive axle (5) and a second drive axle (6), while also provides inter-axle speed differential function. One of the drive axles is also a steering axle. Torqu... | 12/21/1999 |
| 5994811 | Electric motor An electric motor comprising two separate and coaxially spaced armatures as well as a magnet-equipped rotor arranged between the two armatures. One armature is fixed to a motor housing being a static armature, while the other armature is free to rotate, h... | 11/30/1999 |
| 5936321 | Magnet coupling including permanent magnets disposed to define magnetic gap therebetween A position of a second permanent magnet with respect to a first permanent magnet is defined by assembling a driving side support member, a thrust bearing, a spacing member, a radial bearing, and a driven side support member. The first and second permanent... | 08/10/1999 |
| 5856719 | Electromagnetic-coupled/levitated apparatus and method for rotating equipment A drive for rotating equipment that does not require internal or external mechanical seals and obviates the necessity to have internal shaft and bearings, eliminating internal lubrication problems and can be used with different types of prime movers is pr... | 01/05/1999 |
| 5844345 | Homopolar motor with dual rotors A homopolar motor (10) has a field rotor (15) mounted on a frame (11) for rotation in a first rotational direction and for producing an electromagnetic field, and an armature rotor (17) mounted for rotation on said frame (11) within said electromagnetic f... | 12/01/1998 |
| 5838085 | Versatile AC dynamo-electric machine The invention comprises a versatile AC dynamo-electric machine (10) comprising isolated dual stators (50 and 50B and 50C), each both concentrated windings (53C) energizable with single-phase AC, and main windings (53) and a single high inertia sleeve (75)... | 11/17/1998 |
| 5804935 | Drive system for electric vehicles A dual-rotor electric motor (1), having an outer rotor (3) and an inner rotor (4), drives a first drive axle (5) and a second drive axle (6), while also provides inter-axle speed differential function. One of the drive axles is also a steering axle. Torqu... | 09/08/1998 |
| 5760515 | Electrical power generating apparatus and an electrical vehicle including such apparatus A fan assembly (7) is provided for driving an electricity generator, especially for use in the production of electrical power in an electrical vehicle, wherein the fan assembly (7) functions by virtue of an air flow created by forward motion of the vehicl... | 06/02/1998 |
| 5749432 | Power steering gear for motor vehicle A motor vehicle power steering gear has a proportional control valve with first and second valve members connected by a torsion spring and defining a center position with zero torque in the torsion spring. Electromagnetic apparatus for varying the magnitu... | 05/12/1998 |
| 5747909 | Hybrid alternator A hybrid alternator comprising a stator, and a rotor mounted for rotation within the stator and separated therefrom by an air gap. The rotor has a rotor core defining a plurality of magnetic poles wherein adjacent ones of the magnetic poles have alternati... | 05/05/1998 |
| 5534738 | Motor having non-coaxial, synchronized rotors An improved electric motor comprising two rotatable members. The members have rotational axes arranged at an angle to and intersecting one another. The members rotate in tandem, so that an arbitrarily selected point on the end of one member has a correspo... | 07/09/1996 |
| 5455473 | Field weakening for a doubly salient motor with stator permanent magnets A device for field weakening in a doubly-salient variable reluctance motor having permanent magnets in the stator. The field weakening increases the constant power range of the motor and is accomplished by controlled movement of steel insets toward and aw... | 10/03/1995 |
| 5454439 | Power steering gear for motor vehicle A motor vehicle power steering gear having a proportional control valve and an electromagnetic apparatus for varying the effective restoring torque of a torsion bar of the proportional control valve. The electromagnetic apparatus includes a cylindrical ri... | 10/03/1995 |
| 5434454 | Transient-free synchronous electrical power machine Proximity switches and circumferentially movable stator windings allow a motor-generator to simultaneously sense and switch from a synchronous motor position to a synchronous generator position. This mechanism replaces the conventional separate sensing an... | 07/18/1995 |
| 5281880 | Rotary machine The present invention relates to a rotary machine. Main technical problem is in that two rotating forces being different in the rotating direction are taken to the outside using one motor. Consequently, in the invention, a stator (3) is rotatably supporte... | 01/25/1994 |
| 5241232 | Homopolar motor-generator A homopolar motor-generator comprising two homopolar machines in series with a conductive belt transmitting current between the rotors of the machines which are caused to rotate in synchronism in oppositely directed magnetic fields to allow extraction of ... | 08/31/1993 |
| 5089734 | Dual rotary ac generator A generator includes a rotatable housing carrying permanent magnets for creating a magnetic field, an armature carrying electrical coils and a gear set for simultaneously rotating the housing and magnetic-field-creating permanent magnets in a direction op... | 02/18/1992 |
| 5087230 | Drive transmissions In a ships drive transmission, contra rotating propeller shafts are driven by powered means comprising concentric contra rotating drive elements, one of the shafts being connected thereto via epicyclic gearing. The propeller shafts are also coupled to eac... | 02/11/1992 |
| 5038063 | Rotary actuator with limited angular movement A homopolar actuator has a permanent magnet disk element rotatably positioned between a pair of toothed pole pieces with mutually offset teeth, an electromagnetic coil and pole elements coupling the coil flux to the pole pieces. The pole pieces may themse... | 08/06/1991 |
| 4947069 | Low power magnetic tape reel motor and brake assembly There is disclosed a low power motor and brake assembly for a magnetic tape reel of a magnetic tape recorder/player. The magnetic tape reel is driven by a motor having a rotor fixed to the reel shaft and a stator which is rotatably mounted. A brake assemb... | 08/07/1990 |
| 4841185 | Rising frequency generator An alternating current generator has a rotor and a rotatable stator. The moment of inertia of the stator is at least eight times that of the rotor. The electrical output is taken off the windings of the stator or the rotor. In operation, any available mec... | 06/20/1989 |
