Optimized wavelength-division-multiplexed lightwave communication system
Lightwave signal transmission over very long distances is encumbered by the usual problems caused by loss and dispersion in the optical fiber. In addition, such transmission is effected by a weak dep... Read More
Inventors: Marcuse, Dietrich;, Assignee: AT&T Bell Laboratories (Murray Hill, NJ) |
Protection devices and arrangements for telephone lines
According to one aspect this invention provides a protection device comprising: first and second terminals, for connection to a wire of a telephone subscriber line and to ground respectively, and a th... Read More
Inventors: Borkowicz, Jerzy;, Assignee: Northern Telecom Limited (Montreal, CA) |
Thin-film transistor circuit
It is an aim of the present invention to provide a thin-film transistor circuit having an input gate protection device for which the voltage at which conduction occurs is not solely dependent on the t... Read More
Inventors: Brotherton, Stanley D.;, Assignee: U.S. Philips Corporation (New York, NY) |
High voltage tolerant CMOS input/output pad circuits
OF THE INVENTION The drawing, in general, depicts high voltage tolerant CMOS input/output pad circuits in accordance with the present invention, and for use in applications requiring high voltage tol... Read More
Inventors: Motley, Gordon W.; Meier, Peter J.; Maitland, David S.;, Assignee: Hewlett-Packard Company (Palo Alto, CA) |
Method for mounting a semiconductor device in a housing
There are claimed: 1. Method of mounting a semiconductor device in a housing, which comprises first providing a chromium layer on a part of the surface of the monocrystalline silicon semiconductor bod... Read More
Inventors: Exner, Klaus D.;, Assignee: Siemens Aktiengesellschaft (Berlin and Munich, DE) |
Method of producing a microwave filter comprising a body of gyromagnetic material and a source of a prepolarizing magnetic field whose resonant frequency is a predetermined function of the temperature
What is claimed is: 1. A method of fabricating a microwave filter with a resonant frequency which is a predetermined function of temperature, said filter having a gyromagnetic element and a source of ... Read More
Inventors: Pavlik, Klaus J.;, Assignee: U.S. Philips Corporation (New York, NY) |
Method of and apparatus for determining cement strength and extent of setting with a pulsed nuclear magnetic resonance spectrometer
OF THE INVENTION Briefly, the practice of the present invention involves a method of and apparatus for analyzing a cement sample to determine both the extent of setting of the cement and the strength... Read More
Inventors: Herrick, David C.;, Assignee: Amoco Corporation (Chicago, IL) |
Apparatus for the detection of substances and in particular explosives by neutron irradiation thereof
We claim: 1. Apparatus for the detection of a substance liable to be contained in an object (34) comprising: a first inspection station (I to IV), first irradiation means (2, 10) for irradiating said ... Read More
Inventors: Grenier, Gerard; Coursant, Roger H.; Rambaut, Michel;, Assignee: Commissariat A L'Energie Atomique (Paris, FR); Sodern Societe d'Etudes et de Realisations Nucleaires (Limeil Brevannes Cedex, FR) |
CMOS shift register with complementary refresh pass gates and buffer
FIG. 1 is a circuit diagram of a CMOS shift register constructed in accordance with prior technology. The shift register includes pass gates 14, 18, 22 and 26, inverters 15, 19, 23 and 27 for holding... Read More
Inventors: Douglas, Chet R.; Kastner, Michael E.; Rinne, Floyd;, Assignee: Digital Equipment Corporation (Maynard, MA) |
Nuclear magnetic resonance diagnostic apparatus
To achieve the foregoing objects, and in accordance with the purpose of the invention as embodied and broadly described herein, nuclear magnetic resonance diagnostic apparatus is provided wherein a un... Read More
Inventors: Sugimoto, Hiroshi;, Assignee: Tokyo Shibaura Denki Kabushiki Kaisha (JP) |
Mutual inductance NMR RF coil matching device
An NMR scanner apparatus includes an RF coil for transmitting and receiving radio frequency signals. When the coil is operated in the transmitting mode, it is coupled to a source of RF energy. In the ... Read More
Inventors: Jaskolski, Patrick L.; Eash, Matthew G.;, Assignee: General Electric Company (Milwaukee, WI) |
Patient handling arrangements for NMR imaging systems
What is claimed is: 1. In a nuclear magnetic resonance imaging system, including a magnet housing containing a magnet having a bore in which a subject to be imaged is to be located, a patient handling... Read More
Inventors: Carper, Robert L.; Keller, John T.;, Assignee: Technicare Corporation (Solon, OH) |
Self-shielded gradient coils for nuclear magnetic resonance imaging
These and other objects are achieved in a coil system for producing a magnetic field which comprises first and second coils. The first coil is adapted to be coupled to a source of current for providin... Read More
Inventors: Roemer, Peter B.; Hickey, John S.;, Assignee: General Electric Company (Milwaukee, WI) |
Thermal and electromagnetic shield for power meter
I claim: 1. A power meter having a base, an electronic meter mechanism mounted on the base to be connected in an electrical circuit for metering power used in the circuit, a transparent housing part h... Read More
Inventors: Cox, Ned;, Assignee: Texas Instruments Incorporated (Dallas, TX) |
RF shield for RF coil contained within gradient coils of NMR imaging device
OF THE INVENTION Referring initially to FIG. 1, a radio-frequency (RF) shield 10, in accordance with the present invention is a hollow cylindrical conductive member situated between a RF whole body c... Read More
Inventors: Roemer, Peter B.; Edelstein, William A.;, Assignee: General Electric Company (Schenectady, NY) |
Method and apparatus for measuring and controlling the level of hormones in an animal circulatory system
It has been discovered that the concentration of immune-regulating hormones, such as IL-1, in the blood stream over time can be measured accurately and does vary in accordance with behavioral action c... Read More
Inventors: Keppel, William;, Assignee: |
Current mirror arrays
A multiplying current mirror array which controls two units of output current (n=2) with one unit of input current (m=1) is schematically illustrated in FIG. 1. Current mirrors 110, 120 and 130 are e... Read More
Inventors: Schneider, Herbert A.;, Assignee: Bell Telephone Laboratories, Incorporated (Murray Hill, NJ) |
On-line oil-in-wax monitoring apparatus and method
What is claimed is: 1. An on-line oil-in-wax monitor comprising means for periodically sampling a stream of liquid wax and oil to provide samples, means for solidifying the wax in each sample; means f... Read More
Inventors: Skarlos, Leonidas;, Assignee: Texaco Inc. (White Plains, NY) |
Magnetometer having coil formed by two spiral shaped conductors
A simple design for a fluxgate magnetometer is shown in FIGS. 1A and 1B. A thin layer of magnetic material 1 is sandwiched between two substrates 2 and 3. Two drive coils 4A and 4B are formed on the ... Read More
Inventors: Langdon, Roger M.; Smith, Cyril;, Assignee: General Motors Corporation (Detroit, MI) |
Multi-channel magnetic flux detector comprising a magnetometer modular construction in a vessel containing a cooling medium
With the present invention, a substantial improvement to the prior art is gained. The features characteristic to this invention are as follows. The body of the instrument has been subdivided into sepa... Read More
Inventors: Ahonen, Antti I.; Knuutila, Jukka E. T.; Simola, Juha T. A.; Vilkman, Visa A.;, Assignee: Neuromag Oy (FI) |
Magnetic recording head motion translation apparatus for head/media evaluation systems
OF THE PREFERRED EMBODIMENT In reference to FIG. 1 of the drawing, there is shown a partially-broken top view of a magnetic recording head motion translation apparatus in accordance with the preferre... Read More
Inventors: Miller, John H.; Moore, Peter C.;, Assignee: Cecil & Hume Associates, Inc. (Morgan Hill, CA) |
Air bladder apparatus for positioning a magnetic head
I claim: 1. A magnetic head load-unload device for use with an actuator in the recording and reading of information on a magnetic disk, comprising, a support arm, means for suspending a transducer fro... Read More
Inventors: Ekhoff, Donald L.;, Assignee: |
Electric generator that operates with few ampere-turns in field winding
OF PREFERRED EMBODIMENTS Referring particularly to FIGS. 1 and 2, the numeral 20 generally denotes the rotor of one preferred embodiment of electric generator which is made in accordance with the pri... Read More
Inventors: Greene, William J.;, Assignee: Teledyne Walterboro, a Division of Teledyne Industries, Inc. (CA) |
AC Generator with low noise claw tooth rotor
According to the present invention, in order to decrease the magnetic sound which is generated due to the torque variation, at least two pole pieces of at least one of a pair of finger magnetic poles... Read More
Inventors: Taguchi, Masahiro; Inagaki, Mitsuo;, Assignee: Nippon Soken, Inc. (Nishio, JP) |
Dynamoelectric machines for multiples of three phases with unbalanced fractional-slot windings
This invention relates to dynamoelectric machines such as synchronous motors for operation from an AC power supply of six or more phases with fractional-slot windings that are slightly unbalanced but ... Read More
Inventors: Godwin, Gurney L.;, Assignee: Westinghouse Electric Corp. (Pittsburgh, PA) |
Apparatus for fastening an air gap winding
There are claimed: 1. Apparatus for fastening an air gap winding for electric machines having a large power rating, such as turbo generators, comprising a stator lamination stack formed of magnetic la... Read More
Inventors: Boer, Joachim; Beermann, Heinrich;, Assignee: Kraftwerk Union Aktiengesellschaft (Mulheim on der Ruhr, DE) |
Method of manufacturing a copper bar induction rotor
OF THE INVENTION The method of manufacture of this invention is applied to an induction motor rotor of conventional construction, as seen in the drawing. The left-hand end of the rotor, as viewed in ... Read More
Inventors: Shafer, Jr., George G.;, Assignee: General Motors Corporation (Detroit, MI) |
Structure of PM step motor and its fabrication
The present invention has been accomplished to provide a step motor fabrication method which eliminates the aforesaid drawbacks. According to one aspect of the present invention, the top cap and the a... Read More
Inventors: Cheng, Chun-Ying; Lee, Ken;, Assignee: |
Dynamoelectric machine having improved interleaved stator end turns
This invention relates to multiphase dynamoelectric machines having stator members with multi-loop coils disposed therein constituting a stator winding, and more particularly to joining coil sides of ... Read More
Inventors: Davey, Kent R.;, Assignee: Westinghouse Electric Corp. (Pittsburgh, PA) |
Structure of stepping motor and method of driving the stepping motor
An object of a first aspect of the present invention to solve the problem in the first conventional technique is to provide a hybrid stepping motor in which the electrical time constant is reduced wit... Read More
Inventors: Nihei, Hideki; Miyashita, Kunio; Saitoh, Kouichi; Yamashita, Seizi;, Assignee: Hitachi, Ltd. (Tokyo, JP) |
Metal Working 
