Patents by Inventor Akira Tsuzuki

Akira Tsuzuki 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: 4440662
    Abstract: A cleaning composition for contact lenses, comprises, as the major component, polypropyleneoxide-polyethyleneoxide block copolymers (Pluronic type) and/or condensation products of polypropyleneoxide-polyethyleneoxide block copolymers with ethylene diamine (Tetronic type), in which said major component is a mixture of those having an ethyleneoxide content of from 35 to 55% by weight and a molecular weight of from 1,500 to 10,000 and those having an ethyleneoxide content of from 70 to 90% by weight and a molecular weight of at least 4,000.
    Type: Grant
    Filed: September 13, 1982
    Date of Patent: April 3, 1984
    Assignee: Toyo Contact Lens Co., Ltd.
    Inventors: Akira Tsuzuki, Takeo Kibe, Shunichi Hioki
  • Patent number: 4430648
    Abstract: A display device of solid-state matrix type, such as a liquid crystal display device, retains display data for an unlimited period after such data has been written into the display, with no need for periodic re-writing of the display data to compensate for deterioration due to leakage effects. In addition, the display data can be read out again, if required, so that the display device can also be used as a memory. such a display device can also be utilized to perform data input, by writing in of data through application of light to the display surface, such as by using a light pen.
    Type: Grant
    Filed: January 12, 1981
    Date of Patent: February 7, 1984
    Assignee: Citizen Watch Company Limited
    Inventors: Seigo Togashi, Akira Tsuzuki
  • Patent number: 4389728
    Abstract: A frequency divider for electric timepieces or the like comprising a first block composed of even clock controlled inverters connected in cascade, a second block composed of even clock controlled inverters connected cascade and a clock controlled signal compounding circuit. The final stage output terminal of the first block is connected to a second input terminal of the clock controlled signal compounding circuit.
    Type: Grant
    Filed: December 23, 1980
    Date of Patent: June 21, 1983
    Assignee: Citizen Watch Co., Ltd.
    Inventor: Akira Tsuzuki
  • Patent number: 4356483
    Abstract: A method and drive system for driving an electro-optical display device having a matrix of an n-number of digit electrodes having a plurality of electrodes groups spaced from one another, and a plurality of groups of segment electrodes associated with each of said electrode groups to provide a plurality of display elements at each of the groups. m-number of digit electrodes are simultaneously applied with excitation voltages each having at least two potential levels opposite in porality during an excitation period of:1/n<t.ltoreq.m/nwhere t represents the excitation period during which period n-m number of digit electrodes are applied with a non-excitation or reference voltage having a potential level intermediate between the potential levels of the excitation voltages.
    Type: Grant
    Filed: July 14, 1980
    Date of Patent: October 26, 1982
    Assignee: Citizen Watch Company, Limited
    Inventors: Hiroo Fujita, Akira Tsuzuki
  • Patent number: 4345612
    Abstract: An apparatus for supplying a mixture of oxygen and an anesthetic gas at a predetermined flow rate and mixture ratio. The flow rate and mixture ratio are controlled by means of electrically operated throttle valves, responsive to output signals from an electronic control system, generated in accordance with data stored in the control system and with input signals applied to the computer from means for sensing the flow rates of the oxygen and anesthetic gas. Desired flow rate and mixture ratio data may be input by using a numeric keyboard, and are digitally displayed.
    Type: Grant
    Filed: June 9, 1980
    Date of Patent: August 24, 1982
    Assignee: Citizen Watch Company Limited
    Inventors: Tuyoshi Koni, Yoshihisa Urushida, Akira Tsuzuki
  • Patent number: 4345248
    Abstract: A novel type of liquid crystal display device is disclosed, whereby data can be written in, via the display device, by utilizing light-generating means such as a light pen. The display device is of matrix configuration, with a switching element being provided individually for each of the elements of the display matrix, and is characterized by a photoelectric element being provided for each display element, whereby data is written in. The discrimination circuit means whereby the statuses of the photoelectric elements are sensed, in a time sharing manner, can utilize the same row and column electrodes used to drive the switching elements of the display matrix, and the photoelectric elements can be formed during the same process, and upon the same substrate, as the switching elements.
    Type: Grant
    Filed: December 12, 1980
    Date of Patent: August 17, 1982
    Assignee: Citizen Watch Company Limited
    Inventors: Seigo Togashi, Akira Tsuzuki
  • Patent number: 4300137
    Abstract: A matrix driving method for driving an electro-optical display device including digit and segment electrodes arranged in a matrix configuration, in which digit and segment drive signals are applied to digit and segment electrodes in such a manner that the digit drive signals applied to all the digit electrodes have potentials equal in level with each other during a prescribed time interval during which the potential of a first segment drive signal inducing a state of non-display at all the digit electrodes is equal to the potential of each of the digit drive signals.
    Type: Grant
    Filed: July 13, 1979
    Date of Patent: November 10, 1981
    Assignee: Citizen Watch Company Limited
    Inventors: Hiroo Fujita, Akira Tsuzuki, Shigeru Morokawa
  • Patent number: 4268360
    Abstract: When repairing a gate and vicinity of a coke oven chamber during operation, hot air blowing off the interior of the chamber makes repairs impossible or almost difficult. Disclosed is a temporary heat-proof apparatus capable of preventing such hot air from blowing off the chamber, which generally comprises two units in combination, viz. a heat-proof unit and a charging unit therefor. Both front end portions of the heat-proof unit are expandable toward side walls of the oven chamber, while upper and lower slide frames are arranged respectively to pressure-contact the ceiling and bottom of the chamber.
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: May 19, 1981
    Assignee: Koritsu Machine Industrial Limited
    Inventors: Akira Tsuzuki, Hiroshi Tobitani
  • Patent number: 4264967
    Abstract: In an electronic timepiece, a system for producing a unit time signal with a high degree of frequency stability, composed of a low frequency oscillator, a high frequency oscillator of a high degree of frequency stability which is activated only during periodic short intervals, and means for producing a timebase signal which is an exact integral submultiple in frequency of the high frequency oscillator signal, by modifying the output signal from the low frequency oscillator on the basis of periodically recurring phase coincidence between the high and low frequency oscillator signals. Information on this phase variation is stored in digital form, and is utilized to correct the low frequency signal during periods when the high frequency oscillator is inactivated.
    Type: Grant
    Filed: October 16, 1979
    Date of Patent: April 28, 1981
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Hiro Fujita, Akira Tsuzuki
  • Patent number: 4259202
    Abstract: A cleaning and preservative solution for contact lenses which contains as an effective ingredient a monoester of saccharose with a fatty acid having the general formula: ##STR1## wherein R is a saturated or unsaturated aliphatic hydrocarbon group having 8 to 18 carbon atoms. The solution has excellent cleaning and preservative effects. Contact lenses can be cleaned during the preservation of the lenses with soaking them in the solution.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: March 31, 1981
    Assignee: Toyo Contact Lens Co., Ltd.
    Inventors: Kyoichi Tanaka, Akira Tsuzuki
  • Patent number: 4248562
    Abstract: One cycle of operations for pushing-out of the coke, including door removal, jamb cleaning, coke guidance and reinstallation of the removed door can be conducted on one spot by employment of a common passage system for door extractor, jamb cleaner and coke guide cage, and of an automatic centering mechanism which allows the car to be positioned at once exactly in front of the coking chamber without necessity of highly skilled workman.
    Type: Grant
    Filed: October 12, 1979
    Date of Patent: February 3, 1981
    Assignee: Koritsu Kikai Kogyo Company Limited
    Inventors: Akira Tsuzuki, Hiroshi Tobitani
  • Patent number: 4243490
    Abstract: Any type of door bottom surface can be completely cleaned by the cleaning apparatus of this invention which comprises a carriage which is driven along a pair of horizontal platforms per se forming therebetween a passage for the carriage, a pair of supporting plates pivotably mounted on the carriage, a radial cutter device rotatably held by the supporting plates at the latter's frontward ends, said radial cutter device being cylindrical and having thereon several cutting blades radially extending and longitudinally aligned in parallel, a pair of coil springs charged between said front ends of the supporting plates and front portions of the carriage, and drive means for moving the radial cutter device and the carriage itself.
    Type: Grant
    Filed: July 25, 1979
    Date of Patent: January 6, 1981
    Assignee: Koritsu Kikai Kogyo Company Limited
    Inventors: Akira Tsuzuki, Atsushi Miura
  • Patent number: 4244043
    Abstract: A system for performing frequency division of a high frequency signal by intermittent operation of a frequency dividing counter circuit and by a phase lock loop circuit, in which phase lock is periodically achieved with an output of the counter circuit. Phase lock loop circuit is of novel design which provides exact phase lock without cyclic variations from the reference phase.
    Type: Grant
    Filed: March 29, 1979
    Date of Patent: January 6, 1981
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Hiro Fujita, Akira Tsuzuki, Heihachiro Ebiha, Fukuo Sekiya
  • Patent number: 4241435
    Abstract: An electronic timepiece having a high frequency oscillator with a high level of frequency stability and an electronically controlled low frequency oscillator. The phase of a high frequency signal from the high frequency oscillator is compared with a signal from the low frequency oscillator, and a digital signal is produced in accordance with the phase difference. The digital signal alternately controls the frequency of the low frequency signal to be slightly greater than an exact submultiple of that of the high frequency signal and slightly less that an exact submultiple of the high frequency signal, so that with respect to a relatively long time interval the frequency of the low frequency signal is an exact submultiple of that of the high frequency signal, the low frequency signal being thereby utilizable as a timebase signal for the timepiece.
    Type: Grant
    Filed: October 3, 1979
    Date of Patent: December 23, 1980
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Hiro Fujita, Akira Tsuzuki
  • Patent number: 4232510
    Abstract: Timepiece comprising means for attaining the function of measuring the time, a time display means, at least part of which is mechanically formed, a means for changing the displayed content of the time display means in response to the operation of an external actuating member and a means for setting information for setting the condition of a timepiece function in accordance with the operation of the external actuating member, the time display means serving as the display of the information to be set upon the setting of the information whereby there may be easily effected the setting of functions except the time setting without increase of the complication of the display means.
    Type: Grant
    Filed: February 28, 1977
    Date of Patent: November 11, 1980
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Munetaka Tamaru, Akira Tsuzuki, Shigeru Morokawa, Minoru Watanabe, Kazunari Kume, Hideshi Oono
  • Patent number: 4100540
    Abstract: A method of driving a liquid crystal display matrix, in which digit drive signals are applied to digit electrodes and segment drive signals are applied to segment electrodes. Each of the digit drive signals has first pulse components of a first pulse width varying at a plurality of voltage potentials in a first predetermined sequence during each cycle, and a second pulse component of a second pulse width having a selected one of the voltage potentials during each half cycle. Each of the segment drive signals has first pulse components of the first pulse width varying at at least two of the voltage potentials in a second predetermined sequence, and a second pulse component of the second pulse width having a voltage potential equal to that of the second pulse component of the digit drive signal.
    Type: Grant
    Filed: November 17, 1976
    Date of Patent: July 11, 1978
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Hiroo Fujita, Akira Tsuzuki, Shigeru Morokawa
  • Patent number: 4024416
    Abstract: A frequency standard for an electronic timepiece comprising a low frequency oscillator and a high frequency oscillator of which the frequency is an integral multiple of a predetermined frequency of the lower frequency oscillator. A phase difference detector is coupled to the lower and higher frequency oscillators to produce a signal occurring at intervals depending on the phase difference between the two oscillators. A frequency divider is provided to divide down the frequency of the signal by the integral multiple to produce a phase difference signal. The phase difference signal is algebraically added to the lower frequency oscillator signal to generate an output signal of which frequency is equal to that of the high or frequency oscillation signal divided by the integral multiple.
    Type: Grant
    Filed: May 10, 1976
    Date of Patent: May 17, 1977
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Hiro Fujita, Shigeru Morokawa, Akira Tsuzuki