Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 7320896 | Infrared radiation detector Electronic devices are disclosed that may be used for infrared radiation detection. An example electronic device includes a substrate, a transistor included in the substrate and a silicon-germanium (Si—Ge) structural layer coupled with the transistor. The structur... | 01/22/2008 |
| 7266738 | Test apparatus, phase adjusting method and memory controller An inventive test apparatus has a timing comparator for obtaining an output value of an output signal outputted from a memory-under-test with timing of a strobe signal, a logical comparator for comparing the output value obtained by the timing comparator with an exp... | 09/04/2007 |
| 7215853 | Optical module formed on common substrate for branching an optical signal A collimator 111 for an input light, a collimator 112 for an output light, a collimator 113 for a branched light, a collimator 114 for an inserted light and a wavelength selecting filter 115 are provided on a common substrate 13... | 05/08/2007 |
| 7176111 | Method for depositing polycrystalline SiGe suitable for micromachining and devices obtained thereof Method and apparatus to obtain as-deposited polycrystalline and low-stress SiGe layers. These layers may be used in Micro Electro-Mechanical Systems (MEMS) devices or micromachined structures. Different parameters are analysed which effect the stress in a polycrysta... | 02/13/2007 |
| 7075081 | Method of fabrication of an infrared radiation detector and infrared detector device A method of controlling an internal stress in a polycrystalline silicon-germanium layer deposited on a substrate. The method includes selecting a deposition pressure that is at or below atmospheric pressure and selecting a deposition temperature that is no greater t... | 07/11/2006 |
| 7068452 | Method for recording magnetic information and magnetic recording system Stable writing is performed in a super high density hard disk where writing by magnetic field is difficult. A layered thin film structure including at least a magnetic metallic layer/a non-magnetic metallic layer/a magnetic metallic layer is formed, and a metallic p... | 06/27/2006 |
| 7068582 | Read head for ultra-high-density information storage media and method for making the same A micro-electro-mechanical systems (MEMS) device is presented that can read very high density magnetic media and very high density CD ROMs. Both the magnetic and optical read heads comprise one or more cold cathode MEMS e-beam cells. The e-beams are deflected accord... | 06/27/2006 |
| 7022544 | High speed photodiode with a barrier layer for blocking or eliminating slow photonic carriers and method for forming same A structure (and method for forming the structure) includes a photodetector, a substrate formed under the photodetector, and a barrier layer formed over the substrate. The buried barrier layer preferably includes a single or dual p-n junction, or a bubble layer for ... | 04/04/2006 |
| 6972982 | Ring-shaped prism of a holographic ROM system A holographic system for storing data on an interference pattern in a hologram storage medium includes a light source for emitting a laser beam, a beam splitter, modulating means and a refractive material. The beam splitter divides the laser beam into a reference be... | 12/06/2005 |
| 6567331 | Avalanche breakdown memory devices and method of using the same A reverse bias voltage in combination with selective illumination can selectively write data into optical memory. The writing process can be completed quickly since parallel writing of data may be performed. The writing process generates an avalanche curr... | 05/20/2003 |
| 6147889 | Device and a method for the optical recording, storage and readout of information A high memory capacity with relatively low demands on the optical quality of the components used is possible in accordance with the invention by the means to generate the at least two light rays and/or the memory element and/or means to guide the light ra... | 11/14/2000 |
| 5940314 | Ultra-high density memory device A ultra-high density memory device utilizing a photoinductive ferromagnetic thin film. A photoinductive ferromagnetic thin film is formed on a GaAs substrate, and a tip is arranged so as to face the photoinductive ferromagnetic thin film. The GaAs substra... | 08/17/1999 |
| 5511035 | Optical random access memory having diffractive simplex imaging lens An optical memory stores data in an optical data layer capable of selecting altering light such as by changeable transmissivity. Data is organized into a plurality of regions or patches (called pages) in which each page contains a field of data spots stor... | 04/23/1996 |
| 5287300 | Three-dimensional magnetic bubble memory system A compact memory uses magnetic bubble technology for providing data storage. A three-dimensional arrangement, in the form of stacks of magnetic bubble layers, is used to achieve high volumetric storage density. Output tracks are used within each layer to ... | 02/15/1994 |
| 5235569 | Magnetooptical recording method, and apparatus used in the method A method of this invention is a non-overwritable method of recording information on a magnetooptical recording medium in which at least two layers including a first layer comprising a magnetic thin film having a perpendicular magnetic anisotropy, and a se... | 08/10/1993 |
| 5185716 | Three dimensional combined magneto-optical memory and logic processor A three-dimensional combined magneto-optic memory and logic processor consisting of layers of magnetic bubble material spaced from and parallel to one another. Each layer has a pattern of magnetic bubbles formed under the control of an external data proce... | 02/09/1993 |
| 5142491 | Magnetic bubble recording device Disclosed is an improved magnetic bubble recording device for optically effecting writing, reading and erasure of information with respect to magnetic bubbles. The magnetic bubble recording device has a basic structure in which a first magnetic film for f... | 08/25/1992 |
| 5119328 | Solid state memory device A solid state memory device has a thin film for bubble memory, a laser light source, and optical means using a laser light emitted from the laser light source to cause information to be stored in the form of bubbles on the thin film for bubble memory and ... | 06/02/1992 |
| 5086409 | Recording and/or reproducing method of Bloch line memory There is disclosed a method of recording and/or reproducing in/from a Bloch line memory, including the step of: radiating or guiding a light beam to a vicinity of a distal end of a magnetic domain capabable of forming a Bloch line therein or on an extendi... | 02/04/1992 |
| 5072421 | Magnetic memory and recording-reproducing method for the magnetic memory A magnetic memory has a substrate, a magnetic film provided on the substrate including a recording medium capable of producing a recording carrier, and a light waveguide layer on the magnetic film or on that surface of the substrate which is opposite to a... | 12/10/1991 |
| 4952014 | Optical systems with thin film polarization rotators and method for fabricating such rotators An optical system, useful as a magnetometer and as a polarization contoller, is disclosed. The system includes a source of electromagnetic radiation, a detector of electromagnetic radiation, and a magnetizable medium via which the source and detector comm... | 08/28/1990 |
| 4937786 | Binary hologram transducer using magnetic bubbles A hologram transducer using the Faraday effect in magnetic bubble devices for recording and reproducing the amplitude and phase distributions over a section of a beam of coherent light is disclosed. The transducer spatially modulates the intensity, by usi... | 06/26/1990 |
| 4733385 | Signal recording and reproducing apparatus for an opto-magnetic disk A signal recording and reproducing device for use with an opto-magnetic disk having a number of concentric recording tracks. An optical head sweeps a given track at least twice during a time interval equal to a predetermined reproduction time for the trac... | 03/22/1988 |
| 4660173 | Three-dimensional magnetic bubble data storage and optical retrieval system A three-dimensional magnetic bubble memory apparatus formed of at least two arrays of sheets, with the sheets of each array being mounted in spaced and parallel relationship and with the sheets of the two arrays being perpendicular to one another, and wit... | 04/21/1987 |
| 4642795 | Thermomagnetic recording system A region (21) having different magnetic energy from that of other portion is formed in a layer (1b) of soft magnetic material which has an easy axis of magnetization normal to the layer surface and is magnetized in one direction by applying an external bi... | 02/10/1987 |
| 4612587 | Thermomagnetic recording and reproducing system A thermomagnetic recording and reproducing system for use in optical magnetic disc apparatus wherein at least a first layer (1) of soft magnetic material having an easy axis of magnetization normal to the layer surface, a transparent non-magnetic intermed... | 09/16/1986 |
| 4581717 | Thermomagnetic recording method A thermomagnetic recording method is capable of recording information on a layer of soft magnetic material which has an axis of easy magnetization normal to the surface of the layer and in which magnetic bubble domains are generated by application of a bi... | 04/08/1986 |
| 4578651 | Magnetooptical modulator In a magnetic layer of a magnetooptical modulator having fixed magnetic single domain areas, the areas of the layer present between the single domain areas are made electrically conductive by reduction.... | 03/25/1986 |
| 4575179 | Integrated optical signal processor using diffraction of light by magnetostatic waves An integrated optical signal processor device. The device includes a thin film of yttrium iron garnet ferrite material formed on a gadolinium gallium garnet substrate. A guided optical beam in a first polarization mode is directed through the thin film. A... | 03/11/1986 |
| 4550389 | Apparatus and method for switching a magnetic domain lens A magnetic domain device has at least one post element formed from a material that exhibits magnetic domain characteristics and that is positioned on a nonmagnetic substrate material. A pair of electrical drive lines associated with a post element permit ... | 10/29/1985 |
| 4498153 | Output signal detectors of magnetic bubble memory devices In a detector of an magnetic bubble memory device of the type comprising a magnetic bubble memory element having a detector, a source of constant current for passing constant current through the detector for producing a bubble output signal according to t... | 02/05/1985 |
| 4497007 | Magneto-optical storage process This invention relates to a magneto-optical storage and playback process for travelling information carriers, by recording on a magnetizable information carrier (1) in the form of a tape, disc or roller while the carrier is in motion, said information car... | 01/29/1985 |
| 4466035 | Magneto-optic media and system optimization Magneto-optic media and system optimization including a set of optimized magneto-optic media for use in a magneto-optic recording and readout system employing an incident readout light beam of a given fixed power, Po. The beam is delivered in a... | 08/14/1984 |
| 4417324 | Magneto-optic transducer A magnetic to optic transducer based upon magnetic bubble technology is provided. A magnetic sheet with a thin magnetic film guide pattern creating a bubble path thereon responds to external magnetic fields to position magnetic bubbles along the path. A v... | 11/22/1983 |
| 4323984 | Switching equipment using magnetic domains A small, highly reliable and inexpensive switching equipment, in which digital signals to be switched, stored as the presence or absence of magnetic domains in a first magnetic sheet or applied as the presence or absence of light to a flat plane formed by... | 04/06/1982 |
| 4308593 | Interchangeable magnetic bubble memory An interchangeable magnetic bubble memory device having first and second interchangeable memory bubbles, each of the modules including a magnetic bubble memory having at least one major loop or non-recirculating track, each major loop or track including a... | 12/29/1981 |
| 4281396 | Magnetic strip domain memory system A magnetic memory device in which information is stored in the form of strip domains in a layer of magnetic material supported by a layer of ferromagnetic material. The ferromagnetic material contains a pattern of alternately magnetized strips for sustain... | 07/28/1981 |
| 4229072 | Color display system using magneto-optic screen having a dispersive Faraday coefficient A display system using the dispersive Faraday coefficient of a magnetic screen to obtain a color display from white light is disclosed. A beam of energy is directed upon a magnetic screen while concurrently an intensity modulated magnetic field is directe... | 10/21/1980 |
| 4228473 | Pick-up device for magnetically recorded information and method and system for using same A pick-up device for reading out information which has been recorded on a magnetic medium. The device comprises a substrate and a layer of soft magnetic material overlying a surface of the substrate, the easy axis or direction of magnetization being norma... | 10/14/1980 |
| 4195261 | Method and apparatus for measuring the stripe width and collapse field of magnetic materials A method and an apparatus for characterizing magnetic materials especially LPE garnet films for magnetic bubble memory applications are described. The method and apparatus comprises in the first embodiment passing monochromatic linearly polarized light th... | 03/25/1980 |
