Patents by Inventor Shigeru Hayakawa
Shigeru Hayakawa 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).
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Patent number: 4121941Abstract: Calcined material having a composition including at least two of the components 3BaO.ZnO.Nb.sub.2 O.sub.5, 3BaO.ZnO.Ta.sub.2 O.sub.5, 3BaO.MgO.Nb.sub.2 O.sub.5, and 3BaO.MgO.Ta.sub.2 O.sub.5 and produced under optimum processing conditions as disclosed is employed for obtaining ceramics having low microwave loss with large dielectric constant and suitable for use as dielectric resonators, electrical filters, substrates, etc.Type: GrantFiled: November 10, 1977Date of Patent: October 24, 1978Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Syunichiro Kawashima, Masamitsu Nishida, Ichiro Ueda, Hiromu Ouchi, Shigeru Hayakawa
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Patent number: 4086556Abstract: There is provided a humidity sensitive ceramic resistor having high humidity activity, low electrical resistance, quick response rate to humidity and high stability with respect to time, temperature, humidity and electric load which is suited for humidity-controlling devices. The ceramic resistor comprises a ceramic composition comprising at least one component having a spinel type cubic symmetry selected from the group consisting of MgCr.sub.2 O.sub.4, FeCr.sub.2 O.sub.4, NiCr.sub.2 O.sub.4, CoCr.sub.2 O.sub.4, MnCr.sub.2 O.sub.4, CuCr.sub.2 O.sub.4, Mg.sub.2 TiO.sub.4, Zn.sub.2 TiO.sub.4, Mg.sub.2 SnO.sub.4 and Zn.sub.2 SnO.sub.4, and , if desired, at least one component selected from the group consisting of TiO.sub.2, ZrO.sub.2, HfO.sub.2 and SnO.sub.2.Type: GrantFiled: September 2, 1976Date of Patent: April 25, 1978Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tsuneharu Nitta, Ziro Terada, Shigeru Hayakawa
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Patent number: 4080564Abstract: A humidity sensitive resistor device for sensing the humidity of an ambient atmosphere. The device has a humidity sensitive resistor formed by a metal oxide sintered substrate having electrodes on one surface thereof, the resistivity of the humidity sensitive resistor decreasing as the ambient humidity which can affect the surface of the humidity sensitive resistor increases; and a heater positioned near the humidity sensitive resistor for applying radiant heat to the surface of the humidity sensitive resistor, which heater can be used for improving the sensitivity of the humidity sensitive resistor. By the application of a slight amount of radiant heat, the humidity sensitivity increases, and by the application of a large amount of strong heat, stains which may be on the surface of the humidity sensitive resistor such as oil can be cleaned off so as to recover the sensitivity of the humidity sensitive resistor which might have been deteriorated by the stain.Type: GrantFiled: September 27, 1976Date of Patent: March 21, 1978Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tsuneharu Nitta, Ziro Terada, Shigeru Hayakawa
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Patent number: 4057324Abstract: A method of making an electrooptical system including a transparent ferroelectric ceramic element which possesses memory in that a birefringence corresponding to an applied electric field remains after the field is removed. The electrooptical element is hot-pressed from a family of materials which comprises solid solution of the ternary system, lead magnesium niobate-lead titanate-lead zirconate, and the hot-pressed material may additionally contain a small amount of lanthanum oxide (La.sub.2 O.sub.3).Type: GrantFiled: September 12, 1975Date of Patent: November 8, 1977Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Syunichiro Kawashima, Masamitsu Nishida, Yoshihiro Matsuo, Hiromu Ouchi, Shigeru Hayakawa
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Patent number: 4041140Abstract: A method of making a polycrystalline sulphide ceramic body by sulphurizing an oxide material in a carbon disulphide atmosphere at a temperature in the range of 400-1000.degree. C and less than the transforming temperature of the sulphide, which transforming temperature represents either the decomposition temperature or the sublimation temperature inherent to the sulphide. One of the advantages of this method is that sulphides can be easily made by the very strong reduction action of carbon disulphide. This application also relates to sulphides made thereby.Type: GrantFiled: July 16, 1974Date of Patent: August 9, 1977Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tsuneharu Nitta, Shigeru Hayakawa, Yukio Kasahara, Ziro Terada
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Patent number: 4037176Abstract: This invention provides a multi-layered substrate for a surface-acoustic-wave device which substrate comprises a piezoelectric layer on a base, the temperature coefficient of a phase velocity of the surface-acoustic-wave in the piezoelectric layer being different from that of the base, the piezoelectric layer having a thickness less than a wavelength of the SAW. This multi-layered substrate can have a large electromechanical coupling and controlled temperature coefficient of the phase velocity.Type: GrantFiled: March 16, 1976Date of Patent: July 19, 1977Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Shusuke Ono, Kiyotaka Wasa, Shigeru Hayakawa
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Patent number: 4035819Abstract: A method of making a zinc sulphide ceramic body having a low electrical resistance characterized by sulphurizing a starting oxide material consisting essentially of zinc oxide and from 0.01 atomic % to 6.0 atomic % of at least one oxide of a metal selected from the group consisting of aluminum, magnesium, nickel, cobalt, cadmium, lead, indium, bismuth, antimony, titanium, zirconium, silicon, tin, niobium, tantalum, tungsten, and the rare earth element metals in a carbon disulphide atmosphere at a temperature in the range of 700.degree. C to 1000.degree. C. This zinc sulphide ceramic body can be formed into non-linear elements such as phosphors, photoconductors, luminescent elements, varistors, piezoelectric transducers, capacitors and combinations thereof. Particularly, by using this zinc sulphide body in light emitting elements, the luminous efficiency as well as the working voltage can be improved.Type: GrantFiled: October 15, 1974Date of Patent: July 12, 1977Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tsuneharu Nitta, Shigeru Hayakawa, Yukio Kasahara, Ziro Terada
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Patent number: 4016061Abstract: A resistive film composition consisting essentially of AlN and solid solution of TiN and ZrN and a method of making the same by means of cathodic sputtering.Type: GrantFiled: January 16, 1974Date of Patent: April 5, 1977Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kiyotaka Wasa, Fumio Hosomi, Shigeru Hayakawa
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Patent number: 4015230Abstract: Humidity sensitive ceramic resistor having a high humidity activity, a low electrical resistance and a high stability with respect to time, temperature, humidity and electric load and suited for use in humidity-controlling devices is provided by a sintered mixture of a main component, which consists essentially of chromium oxide and at least one metal oxide selected from the group consisting of TiO.sub.2, ZrO.sub.2, HfO.sub.2, SnO.sub.2, Nb.sub.2 O.sub.5, Ta.sub.2 O.sub.5, WO.sub.3, MnO.sub.2, MoO.sub.2, CeO.sub.2, DyO.sub.2, VO.sub.2, SiO.sub.2 and GeO.sub.2, and an addition of at least one metal oxide selected from the group consisting of BeO, MgO, CaO, SrO, BaO, FeO, NiO, CuO, ZnO, CdO and PbO. Furthermore, humidity sensitive thin layer ceramic resistor having an improved quick response to humidity is obtained by sintering a mixture having the above composition with a glass frit binder.Type: GrantFiled: January 27, 1976Date of Patent: March 29, 1977Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tsuneharu Nitta, Ziro Terada, Shigeru Hayakawa
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Patent number: 4013592Abstract: A high temperature thermistor composition comprising a spinel-type Mg Al.sub.2 O.sub.4 and perovskite-type La CrO.sub.3 or (La, Sr) CrO.sub.3 is usable for the temperature range from 400.degree. to 600.degree. C, and a high temperature thermistor composition comprising spinel-type solid solution Mg(Al, Cr).sub.2 O.sub.4 and perovskite-type solid solution (La, Sr) CrO.sub.3 or LaCrO.sub.3 is usable for a higher temperature range up to 1000.degree. C.Type: GrantFiled: February 17, 1976Date of Patent: March 22, 1977Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tomizo Matsuoka, Yoshihiro Matsuo, Shigeru Hayakawa
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Patent number: 3988232Abstract: A crystal film such as a piezoelectric crystal film is formed by sputtering of source material which is in the form of a convex curved surface or a polyhedral surface, and the formed film has crystallographic properties which can be very well controlled.Type: GrantFiled: June 13, 1975Date of Patent: October 26, 1976Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kiyotaka Wasa, Kenzo Ohji, Osamu Yamazaki, Shigeru Hayakawa
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Patent number: 3975307Abstract: A PTC thermistor composition comprising BaTiO.sub.3, TiO.sub.2, one oxide selected from the group consisting of Nb.sub.2 O.sub.5 and Y.sub.2 O.sub.3, Al.sub.2 O.sub.3, SiO.sub.2, Li.sub.2 CO.sub.3, MnO.sub.2 and one oxide selected from the group consisting of Sb.sub.2 O.sub.3 and Bi.sub.2 O.sub.3, and process for the production thereof are provided. Said process is characterized by the addition of TiO.sub.2 and Nb.sub.2 O.sub.5 to BaTiO.sub.3 before calcination and the addition of Al.sub.2 O.sub.3, SiO.sub.2, Li.sub.2 CO.sub.3, MnO.sub.2 and Sb.sub.2 O.sub.3 after the calcination. This PTC thermistor composition has a high breakdown voltage, a large electric current at the initial moment of a voltage application which current decreases rapidly with continuing voltage application, low specific resistivity and, good stability of resistivity.Type: GrantFiled: October 9, 1974Date of Patent: August 17, 1976Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yoshihiro Matsuo, Masanori Fujimura, Tomizo Matsuoka, Shigeru Hayakawa
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Patent number: 3966302Abstract: A panel for a liquid crystal display device has a ceramic substrate, lead conductors on the ceramic substrate, an insulating glass layer over the lead conductors and the ceramic substrate, rear segment electrodes on the glass layer which are electrically connected to the respective lead conductors, a transparent glass plate spaced from the rear segment electrodes by a spacer enclosing the space, and transparent front electrodes on the transparent glass plate and facing the rear segment electrodes. The front and the rear segment electrodes are energized for exciting a liquid crystal within the space. This invention also provides a method of making the panel. The main feature of this invention is to use the ceramic substrate and to form the lead conductors on the ceramic substrate, which conductors are electrically connected to the rear segment electrodes on the glass layer, thereby enabling easy manufacturing and contributing to uniform and efficient display.Type: GrantFiled: October 16, 1974Date of Patent: June 29, 1976Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masanari Mikoda, Hisashi Akatani, Shigeru Hayakawa
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Patent number: 3964033Abstract: An electrooptic storage device having a transparent, ferroelectric ceramic plate, one pair of writing electrodes on opposite surfaces of the ferroelectric ceramic plate, respectively, and one pair of erasing electrodes on opposite edges, respectively of the ferroelectric ceramic plate, the writing electrodes each being a thermally sensitive transparent resistor layer. This device is a device capable of reversible image storage.Type: GrantFiled: December 2, 1974Date of Patent: June 15, 1976Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kiyotaka Wasa, Shunichiro Kawashima, Shigeru Hayakawa
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Patent number: 3962145Abstract: A high temperature thermistor composition comprising essentially a spinel-type solid solution being formed from a unity in the sum of a molar fraction of at least one oxide selected from the group consisting of magnesium oxide, nickel oxide, cobalt oxide, manganese oxide and zinc oxide and a unity in the sum of a molar fraction of aluminum oxide, chromium oxide, and at least one oxide selected from the group consisting of iron oxide, manganese oxide, cobalt oxide and antimony oxide.Type: GrantFiled: June 18, 1974Date of Patent: June 8, 1976Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yoshihiro Matsuo, Shigeru Hayakawa