Patents by Inventor Seiji Okamoto

Seiji Okamoto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6413417
    Abstract: An apparatus for treatment of fluorine waste water has an introduction tank, a main treatment tank, a calcium hydroxide tank, a polychlorinated aluminum tank, a macromolecular flocculant tank, a settling tank, and a concentration tank. Fluorine waste water is introduced from the introduction tank into a lower part of the main treatment tank through a lower inlet pipe. Also, return sludge from the concentration tank and silicon sludge from a silicon waste water treatment system are introduced into an upper part of the main treatment tank. Thus, silicon recovered from silicon waste water is recycled for treatment of fluorine waste water. Also, unreacted chemicals, which have been loaded in the calcium hydroxide tank, polychlorinated aluminum tank, macromolecular flocculant tank, are recycled. The main treatment tank has no stirrer and thus conserves electrical energy, but can still neutralize the waste water.
    Type: Grant
    Filed: January 28, 2000
    Date of Patent: July 2, 2002
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kazuyuki Yamasaki, Kazumi Chujo, Seiji Okamoto, Yukihiro Tao
  • Patent number: 6177005
    Abstract: Ultrapure water having a reduced amount of TOC and a low electrical conductivity is produced in correspondence with a variation in water quality of raw water. A first water tank has an anaerobic organic matter treatment chamber and an aerobic organic matter treatment chamber which are communicated with each other at their bottom portions. Activated carbon bags are arranged in upper portions of both the chambers, and Bincho charcoal is stowed in the lower portion of the chambers. With this arrangement, carbon compounds and organic nitrogen compounds in the water to be treated are biologically treated by microbes, thereby reducing the TOC. Furthermore, nitrate nitrogen generated through the organic nitrogen compound treatment process is denitrified by the anaerobic microbe, thereby reducing the electrical conductivity of the water to be treated.
    Type: Grant
    Filed: October 6, 1998
    Date of Patent: January 23, 2001
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kazuyuki Yamasaki, Toyoichi Nasu, Takahide Miyamoto, Seiji Okamoto, Kazuyuki Sakata, Masami Sera, Atsushi Yokotani
  • Patent number: 6160214
    Abstract: Harmonic signals of frequencies have a relation fn=f1*n* .sqroot.1+C*n.sup.2 /.sqroot.1+C where C is a constant and n is a harmonic number relative to the fundamental frequency f1, are generated and synthesized to produce a modified sound that can be heard comfortably by human ears.
    Type: Grant
    Filed: December 29, 1999
    Date of Patent: December 12, 2000
    Assignee: Kawai Muscial Instruments Mfg. Co., Ltd.
    Inventors: Seiji Okamoto, Toshiya Yoshida
  • Patent number: 6005440
    Abstract: An operational amplifier capable of supplying a large power approximate to a power supply voltage to a load resistance and of rendering the current consumption relative to the power supply voltage small when a signal is not issued. The operational amplifier comprises a first differential amplifying stage, a first amplifying stage, a first level shifting stage, a second differential amplifying stage, a second amplifying stage, a second level shifting stage, and outputting stage, a first phase compensation circuit and a second compensation circuit. The first differential amplifying stage differentially amplifies input signals while n-channel transistors serves as a differential amplifying elements. The second differential amplifying stage differentially amplifies input signals while p-channel transistors serves as a differential amplifying elements. The first amplifying stage amplifies an output of the first differential amplifying stage in opposite phase.
    Type: Grant
    Filed: July 23, 1998
    Date of Patent: December 21, 1999
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Seiji Okamoto
  • Patent number: 5923196
    Abstract: A PLL is provided which is capable of following an input frequency over an extensive range without incurring an increase in the size of circuit arrangement. The PLL 100 includes a band-selectable voltage-controlled oscillator, and a band selection controller. The band selection controller monitors a comparison output from a phase detector and an output from a low-pass filter to deliver a band selection signal, which switches an oscillation band of the voltage-controlled oscillator. Instead of using the band-selectable voltage controlled oscillator, a programmable frequency divider may be used, and its frequency division factor may be changed responsive to the band switching signal.
    Type: Grant
    Filed: March 31, 1997
    Date of Patent: July 13, 1999
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Seiji Okamoto
  • Patent number: 5788838
    Abstract: There is provided an ultrapure water production system which allows recycled waste water to be microbially treated and thereby reclaimed without causing any clogging of treatment system due to abnormal propagation of microorganisms, and which allows ultrapure water with 1 ppb or lower TOC to be obtained. This ultrapure water production system includes a lower part having an anaerobic organism treatment part (12), and an upper part which is placed above the lower part via a separating wall W.sub.B having an opening (16) and which has a biological treatment equipment including an aerobic organism treatment part (1). Since lower anaerobic microorganisms and upper aerobic microorganisms consume nutrition sources for microorganisms, treated water which is difficult for microorganisms to propagate can be obtained. Further, not only TOC but also organic nitrogen compounds are treated by the microorganisms, by which treated water with low electrical conductivity can be obtained.
    Type: Grant
    Filed: August 23, 1996
    Date of Patent: August 4, 1998
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kazuyuki Yamasaki, Seiji Okamoto, Atsushi Yokotani, Kazuyuki Sakata
  • Patent number: 5767801
    Abstract: The present invention aims to provide a linear type digital-to-analog converter which has a great freedom of design and then is not affected by a parasitic capacity. The linear type digital-to-analog converter comprises a lower digital-to-analog converting portion having a plurality of lower serial circuits connected in a ladder manner between a lower output line, and an earthed line and a reference voltage line, the lower serial circuit comprising a lower capacitor and a lower transfer type switch, and a weighted second capacitor connected between the lower output line and the earthed line, an upper digital-to-analog converting portion having a plurality of upper serial circuits connected in a ladder manner between an upper output line, and the earthed line and the reference voltage line, the upper serial circuit comprising an upper capacitor and an upper transfer type switch, and the lower output line and the upper output line are connected through a coupling capacitor.
    Type: Grant
    Filed: January 27, 1997
    Date of Patent: June 16, 1998
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Seiji Okamoto
  • Patent number: 5691496
    Abstract: Only in a transient band of a filter, substantially all frequency bands of the musical tone waveform are subjected to filter processing. Due to this, the drawback that the amount of change of the frequency characteristic of the musical tone gradually changes as a whole from a fundamental wave toward a harmonics and only one part of the frequency characteristic of the musical tone changes is eliminated.Also, the density of frequency components of the frequency band of the musical tone waveform does not change, the related frequency band is shifted in frequency, subjected to filter processing, and further shifted to a frequency in accordance with the musical tone pitch. Due to this, a specific range of the filter characteristic is selected, and the musical tone is subjected to the filter control only within this range.
    Type: Grant
    Filed: February 14, 1996
    Date of Patent: November 25, 1997
    Assignee: Kawai Musical Inst. Mfg. Co., Ltd.
    Inventors: Takashi Suzuki, Seiji Okamoto, Katsushi Ishii, Yutaka Washiyama
  • Patent number: 5641929
    Abstract: Ratios of frequencies of frequency components of formant waveform signals are changed, and consonance of frequency components of a musical tone is controlled. Moreover, amplitudes, frequencies or numbers of formants are controlled depending upon the musical factors, making rich the contents for changing the musical tones.
    Type: Grant
    Filed: June 21, 1995
    Date of Patent: June 24, 1997
    Assignee: Kawai Musical Inst. Mfg. Co., Ltd.
    Inventors: Seiji Okamoto, Katsushi Ishii, Yutaka Washiyama, Sayoko Hirano
  • Patent number: 5559298
    Abstract: An electronic musical instrument produces musical tones based on waveform data, while providing smooth changes between different timbres and at the same time avoiding reduction in the efficiency of waveform compression. The timbre change is carried out in an interpolation interval, the magnitude of which varies in accordance with the magnitude of the timbre change. The data necessary to establish the interpolation interval may be stored and read out of a memory or may be determined by interpolation according to a linear function.
    Type: Grant
    Filed: September 29, 1994
    Date of Patent: September 24, 1996
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventor: Seiji Okamoto
  • Patent number: 5459279
    Abstract: In an electronic instrument, sound waveform is compressed for efficient storage, while quick response from the depressing of keys till the sounding is assured. The electronic instrument is provided with the waveform ROM for storing the waveform of the start of sounding without compressing. The subsequent waveform is compressed and stored in the waveform ROM. The sound source system having a waveform reproducing portion is also provided for developing the compressed stored waveform. The electronic instrument is further provided with a waveform RAM for temporarily storing the waveform developed by the waveform reproducing portion. When the keys of the electronic instrument are depressed, sounds are generated at first based on the uncompressed waveform data, and the compressed waveform data is concurrently developed in the waveform RAM. After all the uncompressed waveform data is read from the waveform ROM, sounds are subsequently generated based on the waveform data developed by the waveform RAM.
    Type: Grant
    Filed: June 1, 1994
    Date of Patent: October 17, 1995
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventor: Seiji Okamoto
  • Patent number: 5432513
    Abstract: In a codec having a coding section A/D converting an analog signal into a digital signal, and a decoding section D/A converting a received digital signal into an analog signal, a decoding timing generating circuit (50) is provided to generate a D/A conversion timing signal (S50) on the basis of a clock signal (S30b) generated by a coding PLL circuit (30) and a reading completion signal (S61a) supplied from decoding controller (61). In synchronism with this signal (S50), a D/A converter 62 converts the digital signal Di read by the decoding controller 61, into an analog signal, and sends it to the decoding filter 63. The decoding filter (63) operates synchronism with the clock signal (S30b) generated by the coding PLL circuit (30) to filter the output of the D/A converter (62), and outputs it as the analog signal (Ao).
    Type: Grant
    Filed: September 8, 1994
    Date of Patent: July 11, 1995
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Seiji Okamoto
  • Patent number: 5420934
    Abstract: An electronic sound processing system comprises a sound waveform looping apparatus which cuts out a portion of an input sound waveform and conducts a looping process for a predetermined cycle of the portion of the waveform. The sound waveform looping process comprises a discrete Fourier transformer for applying a discrete Fourier transform to the input sound waveform, a frequency band remover for removing a predetermined frequency band of the discrete Fourier transformed sound waveform, an inverse discrete Fourier transformer for applying an inverse discrete Fourier transform to the sound waveform from which the predetermined frequency band has been removed, and a looping processor for looping a predetermined cycle of the inverse discrete Fourier transformed sound waveform. By executing the sound waveform looping process, the electronic sound processing system can obtain smooth looped waveforms with easy processes and simple equipment.
    Type: Grant
    Filed: April 14, 1994
    Date of Patent: May 30, 1995
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventor: Seiji Okamoto
  • Patent number: 5379294
    Abstract: An analog front-end circuit has a low-group low-pass filter and a low-group high-pass filter connected in series, a high-group low-pass filter and a high-group high-pass filter connected in series, and switching means enabling the low-group high-pass filter and high-group low-pass filter to be connected in series, thus providing three bandpass filters with different passbands.
    Type: Grant
    Filed: March 28, 1991
    Date of Patent: January 3, 1995
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Hisao Ohtake, Seiji Okamoto, Shoji Fujii
  • Patent number: 5289058
    Abstract: An operational amplifier circuit is composed of a differential amplifier circuit for delivering a signal which is obtained by amplifying a difference between voltage levels of two signals; a level shift circuit for shifting and delivering the voltage level of the signal delivered from the differential amplifier circuit; a first amplifier circuit for amplifying and delivering the signal from the level shift circuit; and a second amplifier circuit for amplifying and delivering the voltage level of the signal delivered from the differential amplifier circuit, and a CMOS output circuit whose conductive state is controlled in accordance with voltage levels of the signals delivered from the first and second amplifier circuits.
    Type: Grant
    Filed: November 24, 1992
    Date of Patent: February 22, 1994
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Seiji Okamoto
  • Patent number: 4494824
    Abstract: A liquid crystal display device comprises a pair of opposed substrates, a transparent electrode on at least one of the substrates, a liquid crystal composition, a characteristic orienting film comprising an organic high copolymer resin film formed at least over the surface of the electrode, and which shows an excellent orientation, and conductive particles mixed within the orienting film to reduce the resistance of the orienting film.
    Type: Grant
    Filed: December 17, 1982
    Date of Patent: January 22, 1985
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takeshi Nakamura, Seiji Okamoto, Kazuyoshi Hirayama