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Assignee: Hitachi , Ltd. (JP)


Location: Not specified.
No. of patents: 724

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NumberTitleIssue Date
6967919Method and apparatus for optical head and optical information reproducing
An optical head for reproducing information contained on an optical information disk includes a plurality of light sources and a plurality of light receiving elements in correspondence with the plurality of laser light sources. There is constructed a constitution in...
11/22/2005
6882557Semiconductor memory device
The contact resistance of each switch is reduced, and the on-resistances of all of the switches are set to be uniform, while the area required for arrangement of bit line selection switches is not increased. The switches are connected to one-side ends of the ...
04/19/2005
6697386Multiplex transmission apparatuses, multiplex transmission networks, and operation method therefor
In a synchronous multiplex network including a plurality of multiplex transmission apparatuses, an overhead is passed through intervening multiplex transmission apparatuses such that administration and maintenance operation information is transmitted and ...
02/24/2004
6378284Gas turbine, combined cycle plant and compressor
A gas turbine, a combined cycle plant and a compressor by which both augmentation of the power output and augmentation of the thermal efficiency can be realized by injecting liquid droplets into inlet air introduced into an entrance of a compressor with s...
04/30/2002
6320785Nonvolatile semiconductor memory device and data writing method therefor
In a nonvolatile semiconductor memory device wherein a plurality of threshold voltages are set so as to store multivalued information in one memory cell, data is first written into the memory cell whose threshold voltage is the lowest as a written state f...
11/20/2001
6308239Interface switching apparatus and switching control method
In order to share a device among a plurality of hosts, a switching section is adapted to select one of the hosts by switching and connect it to the device by a serial interface. The switching section can be controlled from the particular host through at l...
10/23/2001
6070148Electronic commerce system and method for providing commercial information in electronic commerce system
Log information concerning an electronic transaction performed between a transaction device and a business connection server through a network is compared with information concerning a predetermined business connection down-loaded from the server, and the...
05/30/2000
6049139Method and apparatus for detecting abnormality of cable having electrical conduction line surrounding power supply line used in car
In order to detect abnormality of a cable, the cable has an electrical conduction line surrounding a power supply line, an electric potential of the electrical conduction line is controlled by a controller, and the abnormality of the cable is judged by de...
04/11/2000
5974581Information recording method, reproducing method, and reproducing apparatus
In a system recording compressed video and audio signals or computer user data on a disk in the sector unit, to reproduce the data in a simple fashion at a high speed, data to be recorded on the disk is divided into data in a predetermined unit so as to a...
10/26/1999
5808371Apparatus for driving electrical loads provided at a vehicle
An apparatus for driving electrical loads provided at a vehicle by feeding power to the electrical loads, includes a power source for feeding power to a plurality of the electrical loads provided at a vehicle. The plurality of electrical loads are divided...
09/15/1998
5789673Thermal type air flow measuring instrument for internal combustion engine
A thermal type air flow measuring instrument is mounted to a main passage forming an intake air passage of an internal combustion engine and is provided with an auxiliary passage which includes a heating resistor and a temperature sensing resistor therein...
08/04/1998
5708298Semiconductor memory module having double-sided stacked memory chip layout
In the present invention, memory chips are stuck together in stacked fashion by TAB (tape automated bonding), and a multiple memory chip and lead complex like an SOP (small out-line package) is formed of the chips and leads, whereby a memory module of hig...
01/13/1998
5664550Ignition system of internal combustion engine
An ignition circuit is formed in one chip comprising an insulated gate bipolar transistor for controlling the flow of a primary current, a current limiting circuit for limiting the current flowing into the transistor, and a thermal shut-off circuit capabl...
09/09/1997
5615151Semiconductor integrated circuit operable and programmable at multiple voltage levels
Any one of the internal circuits of a semiconductor integrated circuit is made to operate both at a relatively high operating voltage having a predetermined allowable range and at a relatively low operating voltage also having a predetermined allowable ra...
03/25/1997
5512888Communications system having a semiconductor integrated circuit for simultaneous mode control and a system control method
In a communications system having a plurality of stations interconnected by a two-line circuit, in which the two-line circuit consists of a data bus circuit for transmitting a series of data bits between at least one sending station and at least one recei...
04/30/1996
5498109Drilling apparatus of hard brittle material and method thereof
A drilling method and a drilling apparatus of a hard brittle material in which a core drill is used for abrasive grinding of high accuracy and high durability. Therefore, the structure of this invention comprises: a tubular core drill; a collet chuck for ...
03/12/1996
5498897Transistor layout for semiconductor integrated circuit
A semiconductor integrated circuit comprising a MOSFET having a metal wiring layer formed via an insulating film above and along the gate electrode of the MOSFET. The MOSFET is structured such that its channel length is small or channel width is large, an...
03/12/1996
5483642Bus system for use with information processing apparatus
A processor bus linked with at least a processor, a memory bus linked with a main memory, and a system bus linked with at least an input/output device are connected to a three-way connection control system. The control system includes a bus-memory connect...
01/09/1996
5475849Memory control device with vector processors and a scalar processor
A memory control unit connected to a scalar processor having a buffer for storing a copy of block data of a main storage and a vector processor having a store requester for writing data into the main storage is disclosed. The memory control unit has a blo...
12/12/1995
5471559Method and apparatus for fuzzy knowledge reasoning
Fuzzy knowledge stored in a knowledge base is written into a memory. When fuzzy reasoning is executed by a fuzzy reasoning unit based on the content of the memory, a control unit in a central processing unit may modify the knowledge base in the memory. Th...
11/28/1995
5450423Data error correcting/detecting system and apparatus compatible with different data bit memory packages
Memory expansion using memory packages of different generations is performed without unnecessarily increasing the minimum memory capacity of a memory device and while obtaining a high error detecting ability and high reliability. In expanding the capacity...
09/12/1995
5436870Semiconductor memory device
A multiport memory is provided which permits both random access and serial access. In order to reduce parasitic capacitance and improve operating speed, the serial input/output lines are each divided into two parts at their middle points. Sense amplifiers...
07/25/1995
5428953Combined cycle gas turbine with high temperature alloy, monolithic compressor rotor
A high-temperature gas turbine includes a compressor, and a turbine coupled to the compressor, the turbine being capable of rotating at a high speed by a gas of firing temperature generated by a combustor. The compressor includes a combined type rotor sha...
07/04/1995
5418660Information processing apparatus for processing reproduction signal having nonlinear characteristics
A nonlinear compensation A/D converting method and a circuit for compensating asymmetry of a reproduction signal waveform, so as not to deteriorate the performance of a discriminator even if there is a nonlinearity such that the amplitudes of the signal d...
05/23/1995
5301225Method and system for dynamically regulating a power saving period within a radio telecommunication system
A mobile radio telecommunication system and method provide battery-saving receiving of mobile stations. The mobile station autonomously changes the period of intermittence according to the frequency of paging in order to reduce the power consumption of th...
04/05/1994
5264319Photosensitive resin composition having high resistance to oxygen plasma, containing alkali-soluble organosilicon polymer and photosensitive dissolution inhibitor
Disclosed herein is a photosensitive resin composition composed mainly of an alkali-soluble organometallic polymer and a photosensitive dissolution inhibitor. The composition is used as a positive type resist which can be developed with an alkali developi...
11/23/1993
4979109Method of controlling a data dictionary directory system in a data base system
In a data dictionary directory system, the definition information to be registered in a dictionary is registered being divided into several definition units. A data base system registers the definition information and confirms the coordination of the cont...
12/18/1990
4970719Digital signal multiplexing apparatus
A digital signal multiplexing apparatus comprising variable multiplexers each of which can alter a multiplexed channel format every call in compliance with a subscriber's request, a fixed multiplexer which has a multiplexing capacity integral times as lar...
11/13/1990
4956869Method of tracing contour and a system therefor
A system for tracing contour to prepare contour coordinates by tracing contour lines of a figure from an image that consists of a set of a plurality of lines, comprising a memory stored in advance from a basic pattern related to figure contour lines of po...
09/11/1990
4951212Automobile driving guide apparatus
In order to provide information for searching for a desired destination on the basis of the purpose of use of a facility at that destination and for selecting an optimum destination out of several candidates for a distination at which are located faciliti...
08/21/1990
4899355X-ray lithography system
An X-ray lithography system comprises an X-ray source which forms a plasma, a band slit located between the X-ray source and a resist film such that a short slit side is parallel with a central axis of a plasma column, the long slit side being tilted with...
02/06/1990
4752849Carriage support structure
A carriage in a position control mechanism using an access mechanism of a magnetic disk device or a linear motor is supported linearly movable in parallel to a positioning reference plane on a stationary side by means of a carriage support mechanism. The ...
06/21/1988
4729108Apparatus for determining a coordinate of a given point on a tablet
A coordinate detection system is disclosed which comprises a pointer which is excited by current of a predetermined frequency. Two conductors are arranged on a tablet for producing voltages which depend on the position of the tablet at which the pointer i...
03/01/1988
4656606Semiconductor memory device providing a selection circuit change-over arrangement
A read-only memory has a terminal for receiving a writing current and a data input/output terminal. In the writing operation, the writing current is supplied to the terminal which is different from the data input/output terminal. Therefore, a data output ...
04/07/1987
4411971Lithium compounds
This invention relates to lithium compounds composed of a lithium halide and lithium imide. The compounds are high in lithium ionic conductivity and are used as solid electrolytes. Particularly excellent ones of the lithium compounds are those represented...
10/25/1983
4134196Method of production of a wire-shaped composite addition material
An addition material in powder or particulate form comprising at least one addition agent selected from the group consisting of calcium, magnesium and aluminum is extruded to provide a compact core wire, which is enveloped by a tape of iron or steel. The ...
01/16/1979
4122216Ferro-magnetic acicular particles for recording medium and process for preparing the same
Ferro-magnetic, acicular particles for a recording medium prepared by treating metal hydroxides, the metal component mainly consisting of iron and cobalt, with an oxidative gas in an aqueous alkaline medium wherein magnetic, acicular particles of iron oxi...
10/24/1978
4097781Atomic spectrum light source device
An anode and a cathode are disposed in an opposing relation in a tubing in which an inactive gas is enclosed to form a discharge lamp by which an atomic spectrum is emitted. The cathode contains atomic spectrum emitting elements also serving to form the m...
06/27/1978
4097824Variable equalizer
A variable equalizer adapted to be fabricated in an integrated circuit structure and having improved compensation characteristics comprises a parallel connection of two circuits, one including a series connection of a first impedance circuit (impedance: Z...
06/27/1978
4097857Apparatus for selectively displaying analogue quantities of plural input data signals
A display apparatus receives analogue signals representing the detected values of the number of revolutions per minute of an automobile's engine, the residual fuel, the automobile's speed, the temperature at the various portions of the automobile and the ...
06/27/1978
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