Assignee: Nippon Telegraph and Telephone Corporation (JP)

Location: Not specified.
No. of patents: 31

Number	Title	Issue Date
6701088	IP packet transmission equipment An arbitrary signal is converted to IP packets, which are routed by an IP packet routing part to Optical path signal conversion parts. Optical path signals from the Optical path signal conversion parts are provided directly to an optical path route switch...	03/02/2004
6697997	Recording medium with a signed hypertext recorded thereon signed hypertext generating method and apparatus and signed hypertext verifying method and apparatus In a hypertext made up of a plurality of linked documents, each document is composed of a document ID, an issuer ID, a property definition, and a signature attached to the document in its entirety. The property definition includes a property name 402, a v...	02/24/2004
6695471	Method and apparatus for measuring temperature of movable object A temperature meter for measuring temperature of a measurement target object to which a temperature sensor cannot be fixed directly is formed by a temperature sensor configured to measure an observed temperature in a vicinity of the measurement target obj...	02/24/2004
6678087	Optical amplifier and optical fiber communication system using the amplifier An optical amplifier is implemented which can reduce its size and cost by using a smaller number of components. Signal light coupled by an optical combiner with pump light fed from a pumping light source is incident on an EDF (erbium-doped fiber) to be pu...	01/13/2004
6667498	Nitride semiconductor stack and its semiconductor device A transistor structure is implemented which can achieve high current gain by causing electrons injected from an emitter to reach a collector. An InGaN graded layer, which is interposed between a p-type InGaN layer and an n-type GaN layer, includes an In c...	12/23/2003
6654532	Read-only laminated information recording medium and manufacturing method therefor A laminated optical medium for read-only information recording has ultra-high memory capacity and reliably extracts desired information from laminated memories. Methods for low-cost mass production of laminated read-only medium are demonstrated. The optic...	11/25/2003
6649361	Surface plasmon resonance enzyme sensor A surface plasmon resonance enzyme sensor including a sensing part 6 having an optically transparent base 1, a thin metal film 2 made of gold or silver, and a film 4 provided on the metal thin film 2 causing electron transfer reaction with both the thin m...	11/18/2003
6626590	Optical communication network A wavelength division multiplexing ring network is constructed using a simple architecture and a fewer number of hardwares between the nodes compared with the conventional ring network. Each node is structured so that any number of multiple waves can be p...	09/30/2003
6246796	Method and apparatus for transmitting or processing images The present invention provides an image transmission method employing phase/amplitude resolution processing in which three-dimensional data of an object recorded as a holographic fringe pattern by means of reference light and light from the object are tra...	06/12/2001
6191624	Voltage comparator In a voltage comparator, a positive feedback circuit having first and second inverters compares the potential of the input terminal of the first inverter with the potential of the input terminal of the second inverter and outputs the comparison result fro...	02/20/2001
6120924	Perovskite-type oxide materials containing nickel and iron for air electrode and solid oxide fuel cell using the same A solid oxide fuel cell, which converts a chemical reaction between a fuel and air or oxygen into electric energy, and which is constructed by a solid electrolyte, an air electrode mounted adjacent to the solid electrolyte, a fuel electrode, and an inter-...	09/19/2000
4928010	Observing a surface using a charged particle beam An arrangement for observing a surface using a charged particle beam irradiated on the surface of a specimen and detecting secondary electrons emitted. An exciting device produces a strong magnetic field substantially perpendicular to the surface of the s...	05/22/1990
4720734	Low loss and high speed diodes A diode having a Schottky barrier which permits bidirectional passage of minority carriers as well as majority carriers through the provision of a bidirectional conducting Schottky electrode that substitutes for the conventional Schottky electrode used in...	01/19/1988
4566940	Manufacturing process for semiconductor integrated circuits A semiconductor integrated circuit in which layers such as an field isolation region, a gate electrode, interlayer insulating films and interconnection lines are formed by the combined use of a lift-off process and an ECR plasma deposition process. Accord...	01/28/1986
4543592	Semiconductor integrated circuits and manufacturing process thereof A semiconductor integrated circuit in which layers such as an field isolation region, a gate electrode, interlayer insulating films and interconnection lines are formed by the combined use of a lift-off process and an ECR plasma deposition process. Accord...	09/24/1985
4491700	Hybrid circuit in a telephone subscriber interface circuit A hybrid circuit composed of semiconductor current amplifiers without an inductance and large capacitance has been found. The DC speech current supplied by the DC power source (33) and the speech signal from the modem (28) are adjusted by the current ampl...	01/01/1985
4448800	Method for the manufacture of semiconductor device using refractory metal in a lift-off step A semiconductor manufacturing method which uses a refractory metal as a lift-off material and employs, in combination, a dry etching process suitable for forming a miniature pattern without undercutting and a film deposition method for deposing the lift-o...	05/15/1984
4399372	Integrated circuit having spare parts activated by a high-to-low adjustable resistance device Disclosed is a semiconductor integrated circuit device comprising a semiconductor chip including a plurality of elements constituting multi-functional circuits and a control signal generating circuit incorporated within the semiconductor chip. The control...	08/16/1983
4254498	Time division telephone switching systems The telephone switching system comprises a plurality of speech path units, a juncture switch unit for interconnecting the speech path units, a central processing unit for controlling the speech path units and the junctor switch unit. Each speech path unit...	03/03/1981
4242662	Method and apparatus for pattern examination A pattern to be examined is scanned to produce binary information of divisional regions of the pattern corresponding to the picture elements of respective scanning lines as parallel information. The parallel information regarding the shape and position of...	12/30/1980
4227078	Photo-sensor A photo-sensor wherein a bundle of optical fibers in the form of a sheet is disposed within a predetermined substrate, the optical fiber bundle extending from a first surface to a second surface of the substrate, an array of photosensitive elements is dis...	10/07/1980
4210996	Trimming method for resistance value of polycrystalline silicon resistors especially used as semiconductor integrated circuit resistors Current having a density higher than a critical value is passed through a polycrystalline resistor doped with impurities at a concentration higher than a critical value to decreasingly correct the initial value of the resistance, thereby trimming the resi...	07/08/1980
4207435	Channel translators for use in time division digital exchangers PCM 24 channel digital voice information received from an incoming trunk are sequentially stored in a speech data memory device for respective channels through an input buffer memory device. The addressed content of the speech data memory device is read o...	06/10/1980
4156880	Method for transmitting a facsimile signal by sequential edge differential coding A method and apparatus for removing redundancy of scan data of pictures by coding it to reduce the transmission time or compress the transmission bandwidth. The edge states between white and black areas on the preceding line and the current line are class...	05/29/1979
4146902	Irreversible semiconductor switching element and semiconductor memory device utilizing the same A semiconductor switching element comprised by a high resistivity polycrystalline silicon resistor whose resistance irreversibly decreases to a small value at a threshold voltage upon the voltage across the resistor reaching the threshold voltage. A semic...	03/27/1979
4128828	Differential detection systems with non-redundant error correction The differential detection system comprises a demodulator for a modulated carrier transmission system for binary signals, in which a symbol detected from the phase difference between the received signal delayed by one signaling interval and the signal rec...	12/05/1978
4128845	Semiconductor integrated circuit devices having inverted frustum-shape contact layers Inverted frustum shaped polycrystalline semiconductor layers are formed on the emitter and collector regions provided on one surface of a semiconductor substrate, and conductor layers are applied on the upper surfaces of the polycrystalline semiconductor ...	12/05/1978
4096440	Control system for mobile radio communication A control system for mobile radio communication, in which the whole service area is composed of a plurality of small radio service zones in each of which communication is sufficiently possible with the transmitting power of any of mobile stations belongin...	06/20/1978
4074300	Insulated gate type field effect transistors In an insulated gate type field effect transistor comprising spaced source and drain regions, an insulating film between the source and drain regions and a gate electrode mounted on the insulating film, an inverted frustum shaped polycrystalline semicondu...	02/14/1978
4057758	Mobile diversity radio communication system A diversity system in a mobile radio communication system provided with a plurality of antenna systems operating over a multipath medium in at least one of the sending path and the receiving path. At the sending path, a carrier wave frequency- or phase-mo...	11/08/1977
3982906	Production of aluminum-aluminum oxide dispersion composite conductive material and product thereof Manufacture of an aluminum-aluminum oxide dispersion composite conductive material (hereinafter referred to as Al-Al2 O3 dispersion composite conductive material) by compacting aluminum powder prepared by the atomization method, the ...	09/28/1976

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Assignee: Nippon Telegraph and Telephone Corporation (JP)