Patents Represented by Law Firm Antonelli, Terry & Wand
  • Monolithic FET bridge attenuator
    Patent number: 4737739
    Abstract: A monolithic FET bridge attenuator contains four single gate FETs, the source-drain path of each of which forms a respective arm of the bridge. The attenuation control electrodes (gates) of the FETs in opposite arms of the bridge are connected to a common control voltage. A first pair of diagonally opposing nodes of the bridge are coupled to receive respective input signals that differ in phase by 180.degree.. A second pair of diagonally opposing nodes of the bridge disposed between the first pair of nodes provide a pair of output signals differing in phase by 180.degree.. In effect, each FET has the electrical behavior of a parallel RC circuit, the resistive component of which is controlled by the gate voltage.
    Type: Grant
    Filed: October 2, 1986
    Date of Patent: April 12, 1988
    Assignee: Harris Corporation
    Inventors: Charles D. Rosier, Donald K. Belcher, Seward T. Salvage
  • Inverter type switching power supply with transformer and short circuit arrangement therefor
    Patent number: 4737974
    Abstract: An inverter-type switching power supply circuit which comprises an inverter for converting the DC output of a DC power source to an AC output, a transformer for receiving the AC output of the inverter, a rectifier for rectifying the output of the transformer, a smoothing capacitor for smoothing the output of the rectifier and supplying it to a load, and a transformer short-circuiting circuit for short-circuiting either the primary side or the secondary side of the transformer. The transformer is frequency controlled such that the product of the applied voltage and time of the transformer becomes constant. Thus, the transformer can be designed to have a small size and a light weight.
    Type: Grant
    Filed: January 14, 1985
    Date of Patent: April 12, 1988
    Inventors: Hirofumi Hino, Masaji Ohtakeguchi, Norikazu Tokunaga, Kazuo Kaneko
  • Optical waveguide having a silicon oxi-nitride layer
    Patent number: 4737015
    Abstract: An optical waveguide comprising a layer formed on a substrate, having a mixed composition of silicon oxide and silicon nitride and having an arbitrary value of refractive index ranging between those of the silicon oxide and the silicon nitride. The layer of said mixed composition can be formed on the substrate to easily fabricate the optical waveguide of the present invention by conducting a sputtering method employing a Si target and controlling the composition of a sputtering gas composed of a mixture of N.sub.2 and O.sub.2 gases.
    Type: Grant
    Filed: November 26, 1984
    Date of Patent: April 12, 1988
    Assignee: Hitachi, Ltd. Hitachi Cabel
    Inventors: Koji Ishida, Hiroyoshi Matsumura, Kenji Hiruma, Kazuyuki Nagatsuma, Akihito Hongo
  • Optical switching device utilizing multiple quantum well structures between intersecting waveguides
    Patent number: 4737003
    Abstract: An optical switch wherein a stripe layer of a compound semiconductor whose refractive index is changed by changing a carrier concentration thereof is disposed so as to cut off both optical waveguides at a position of a longer diagonal line of an intersection portion between the optical waveguides formed on a substrate of a compound semiconductor and intersecting each other at a predetermined angle, and the refractive index is changed by causing current to flow to the stripe layer.
    Type: Grant
    Filed: December 21, 1984
    Date of Patent: April 12, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Hiroyoshi Matsumura, Naoki Chinone, Koji Ishida
  • Crystal monochromator
    Patent number: 4737973
    Abstract: A focusing X-ray crystal monochromator in which one or more crystal layers having different spacings of lattice plane are stacked on a crystal base. Due to different spacings of lattice plane, the angle of reflection and diffraction of a diverging incident X-ray beam can be so changed that the beam takes a parallel or focusing direction for monochromatization. Thus, the monochromator of the present invention can be applied to the X-ray lithography for transferring a pattern of high resolution or the X-ray analysis such as the fine X-ray diffraction.
    Type: Grant
    Filed: December 15, 1986
    Date of Patent: April 12, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Taro Ogawa, Shinji Kuniyoshi, Yoshinori Nakayama, Takeshi Kimura
  • Impregnated cathode
    Patent number: 4737679
    Abstract: The present invention relates to an impregnated cathode produced by attaching at least two layered thin films, the thin films comprising an under layer consisting of a high melting point metal thin film composed of, for example, Os, Ru, Rh, Pd, Ir, Pt, Re, Mo, W, Ta, etc., and an over layer consisting of a high melting point metal layer which contains Sc.sub.2 O.sub.3 and which is placed over the layer, on the surface of the impregnated cathode pellet generated by impregnating a refractory porous base body with electron emissive materials. The invention relates also to an electron tube having this cathode. This cathode maintains a low work functional mono-layer stably for a long period of time on its surface.
    Type: Grant
    Filed: February 5, 1986
    Date of Patent: April 12, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Shigehiko Yamamoto, Sadanori Taguchi, Toshiyuki Aida, Isato Watanabe, Susumu Kawase
  • Seismic prospecting method using vehicles moving in opposite directions
    Patent number: 4737938
    Abstract: A seismic prospecting method comprising the use of at least two vehicles for moving an acoustic wave emission assembly and a reception assembly such as a seismic streamer. The method consists in performing successive cycles of emission of acoustic waves, of reception and of recording of the acoustic waves coming from reflecting interfaces of the subsoil and combining the recording so as to provide multiple coverage. The vehicles follow paths such that the angle formed by the respective advancing directions remains greater than or equal to 90.degree. in absolute value.
    Type: Grant
    Filed: February 14, 1986
    Date of Patent: April 12, 1988
    Assignee: Institut Francais du Petrole
    Inventor: Gerard Grau
  • Ultrasonic probes
    Patent number: 4736631
    Abstract: Disclosed is an ultrasonic probe which is capable of externally and selectively controlling the conversion efficiency of an electroacoustic conversion portion. For the electroacoustic conversion portion is used a material which does not exhibit or exhibit the piezoelectricity depending on the absence or the presence of bias electric field, for example, a certain kind of ferroelectric material which is maintained at a temperature in the vicinity of the phase transition temperature thereof or a material having high electrostrictive effect. The electroacoustic conversion efficiency is controlled by applying bias electric field to such a material.
    Type: Grant
    Filed: September 4, 1986
    Date of Patent: April 12, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Takeuchi, Chitose Nakaya, Kageyoshi Katakura
  • Electron microscope
    Patent number: 4737640
    Abstract: An electron microscope provided with a wobbler device forms a magnified image of a specimen on a fluorescent panel therein. This magnified image is displayed on a monitor by means of a television camera. The microscope is provided with a synchronizer for allowing the wobbler device to change deflection angles of a beam of electrons in synchronism with a synchronizing signal for the monitor.
    Type: Grant
    Filed: April 9, 1986
    Date of Patent: April 12, 1988
    Assignee: Hitachi, Ltd.
    Inventor: Toshiyuki Ohashi
  • Data processing device
    Patent number: 4736288
    Abstract: A data processing device which is equipped with a plurality of arithmetic units so that a plurality of instructions may be processed in parallel by the plural arithmetic units. The device includes a register control circuit for assigning one of a plurality of physical registers to store instructions when more than one of the instructions requires the use of the same logical register. This correspondence between the physical and logical registers is maintained while instructions are subsequently transferred to the arithmetic units where they are processed in parallel.
    Type: Grant
    Filed: December 18, 1984
    Date of Patent: April 5, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Yooichi Shintani, Tohru Shonai, Shigeo Takeuchi
  • Method and apparatus for driving a disk
    Patent number: 4736263
    Abstract: In a disk unit having a rotating mechanism to rotate the disk by pinching the disk at both sides, and a loading mechanism to bring a read-write head into contact with the disk, a method for driving the disk includes the steps in which, at the time of recording and reproduction, the rotating mechanism and the loading mechanism are actuated simultaneously, and when the recording and reproduction are completed, the rotating mechanism is stopped simultaneously with release of the loading mechanism, or after the lapse of a predetermined time from the release.
    Type: Grant
    Filed: August 19, 1985
    Date of Patent: April 5, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Mikio Takahashi, Yasuo Yamamoto, Yoshihiro Moribe, Akira Chuma, Kazuo Nakagoshi, Nobukuni Ohkubo
  • Vibratory compaction working machine
    Patent number: 4735523
    Abstract: A vibratory compaction working machine has a lower travel structure and an upper swing structure mounted on the lower travel structure. The upper swing structure has a boom mounted thereon for pivotal movement by a first hydraulic cylinder, an arm mounted on the boom at its forward end for pivotal movement by a second hydraulic cylinder, and vibratory plate compactor mounted on the arm at its forward end for pivotal movement by a third hydraulic cylinder. The arm is in the form of an extension arm having a first arm element and a second arm element mounted for linear movement relative to the first arm element by a fourth hydraulic cylinder. The first arm element is attached at the forward end of the boom for pivotal movement by the second hydraulic cylinder, and the second arm element has the vibratory plate compactor attached to the forward end thereof for pivotal movement by the third hydraulic cylinder.
    Type: Grant
    Filed: June 25, 1986
    Date of Patent: April 5, 1988
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Yasuaki Ishikawa, Hirokazu Miyagawa, Shiro Murakami, Hiroshi Koma, Yutaka Ikeda, Yoshifumi Itou
  • Nuclear magnetic resonance imaging method
    Patent number: 4736160
    Abstract: In order to make an accurate display possible even in case image data having been subjected to a Fourier transformation have negative values, the sampling timing deviations of measured signals having phase errors based on various factors are detected from the gradient of the linear components of the image data having been subjected to the Fourier transformation, and the density values of the image having the detected timing deviations corrected are displayed.
    Type: Grant
    Filed: May 28, 1986
    Date of Patent: April 5, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Koichi Sano, Shimbu Yamagata, Koichi Haruna, Hideaki Koizumi, Shinichi Sato, Tetsuo Yokoyama, Ryuzaburo Takeda
  • Ultrasonic measurement apparatus
    Patent number: 4735211
    Abstract: An ultrasonic measurement apparatus provided with a probe connected to a Doppler flow meter, and a movement detecting probe, both of which probes are mounted on an actuator, which is driven by a synthesizer which is adapted to repeatedly reproduce a set waveform synchronously with the cardiac motion of a living body, whereby the distance between the probes and a region of interest in the interior of the living body is kept substantially constant irrespective of the movement, which occurs due to the cardiac motion, of the region of interest to enable a measurement signal from the region of interest to be constantly obtained. The movement detecting probe is connected to a M-mode imaging apparatus to thereby make it possible that a M-mode image thereon be monitored to determine whether a suitable waveform is generated by the synthesizer.
    Type: Grant
    Filed: January 31, 1986
    Date of Patent: April 5, 1988
    Assignee: Hitachi, Ltd.
    Inventor: Wasao Takasugi
  • Monolithic integrated circuit having common external terminal for analog and digital signals and digital system using the same
    Patent number: 4736337
    Abstract: Herein disclosed is a digital semiconductor integrated circuit which is equipped with: a digital signal input circuit; an analog signal input circuit made receptive of an analog signal for feeing out a digital signal corresponding to said analog signal; and a common external terminal connected commonly with the input terminals of said digital signal input circuit and said analog signal input circuit. By the preparation with the use of a suitable switch circuit, the aforementioned common external terminal can be used as either an analog signal input terminal or a digital signal input terminal. As a result, the number of the external output terminals required for the aforementioned semiconductor integrated circuit can be reduced.
    Type: Grant
    Filed: May 13, 1986
    Date of Patent: April 5, 1988
    Assignee: Hitachi, Ltd.
    Inventor: Shirou Baba
  • Torque control apparatus for rotary machine
    Patent number: 4736143
    Abstract: A torque control apparatus for a compressor driven by a motor through a main shaft, in which variations of the rotation speed of the main shaft due to torque variations are detected at selected angular positions of rotation of the main shaft. Current values to be supplied to the motor for eliminating the rotation speed variations depending on the angular positions of rotation of the main shaft are computed and stored during at least one revolution of the main shaft, and, in the next revolution of the main shaft, that is, when the main shaft rotates then to a 360.degree. advanced angular position, the motor current is controlled on the basis of the current values supplied for at least one revolution of the main shaft, thereby eliminaitng variations of the rotation-speed of the main shaft.
    Type: Grant
    Filed: October 6, 1986
    Date of Patent: April 5, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Yozo Nakamura, Mitsuru Nakamura, Sigeru Machida, Tsunehiro Endo, Hiroaki Hata
  • Instrument for parallel analysis of metabolites in human urine and expired air
    Patent number: 4735777
    Abstract: An apparatus for measuring metabolites contained in human expired air and for measuring metabolites contained in human urine and for extracting a correlation between the metabolite data in the expired air and the metabolite data in the urine is suitable for parallel analysis of the metabolites in human urine and expired air. An atmospheric pressure ionization mass spectrometer is suitable for measuring metabolites in the expired air. By storing reference data showing the relation between the metabolites in the expired air and those in the urine and, by comparing such data with a subject's metabolite data in the expired air and the metabolite data in the urine, abnormality of a subject can be detected.
    Type: Grant
    Filed: February 12, 1986
    Date of Patent: April 5, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Yasuhiro Mitsui, Osami Okada
  • Turbo molecular pump
    Patent number: 4735550
    Abstract: According to the turbo molecular pump of the present invention, a regenerative pump is constructed by arcuate eddy current grooves having a predetermined angle with respect to the surface of the outer periphery of a rotor and which are circumferentially engraved in array in the rotor and an arcuate ventilating channel engraved in the circumferential direction in a stator, and a partition is defined in the stator circumferentially partitioning the ventilating channel, so that the working range on the low vacuum side may be extended.
    Type: Grant
    Filed: July 30, 1986
    Date of Patent: April 5, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Takeshi Okawada, Shinjiro Ueda, Susumu Yamazaki, Masahiro Mase, Nobukatsu Arai, Kazuaki Nakamori
  • Vapor reflow type soldering apparatus
    Patent number: 4735001
    Abstract: A vapor reflow type soldering apparatus is provided with a vapor generating tank in which liquefied thermal medium is heated to be converted into vapor. An article or part to be processed is delivered through the vapor generating tank by a conveyor, and a soldering material of the article is heated and molten by the vapor of the thermal medium. The soldering apparatus is further provided with at least one unit or system for introducing the liquefied thermal medium into the vapor generating tank. The liquefied thermal medium is delivered through a pipe provided at a position where heat-exchange between the liquefied thermal medium of the pipe and the high temperature thermal medium is possible to be effected. The liquefied thermal medium is introduced into the vapor generating tank after it has been preheated through the heat exchange with the high temperature thermal medium.
    Type: Grant
    Filed: April 24, 1987
    Date of Patent: April 5, 1988
    Assignee: Hitachi Techno Engineering Co., Ltd.
    Inventors: Haruo Mishina, Keizo Thuchiya
  • Multilayered ceramic wiring circuit board and the method of producing the same
    Patent number: 4736276
    Abstract: Ceramic insulating substrate layers (1) for a multilayered ceramic wiring circuit board (3) consist essentially of crystals of mullite and sillimanite, non-crystalline silicon dioxide occupying the interstices between the crystals and magnesium oxide dissolved substantially in the crystals in solid solution and have a thermal expansion coefficient of 40-60.times.10.sup.-7 /.degree. C. and a dielectric constant below 6.7.
    Type: Grant
    Filed: May 21, 1986
    Date of Patent: April 5, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyuki Ushifusa, Satoru Ogihara, Kousei Nagayama, Hiroichi Shinohara, Gyozo Toda