Patents Assigned to TDK Electronics
  • Process for producing acicular goethite
    Patent number: 4255409
    Abstract: An alkali hydroxide is added to an aqueous solution of ferrous salt to form a precipitate and a part of the solution is separated to control a ratio of an anion to a ferrous component to less than 1 and the ferrous component is oxidized to acicular goethite with an alkali metal chlorate such as potassium chlorate.
    Type: Grant
    Filed: December 11, 1979
    Date of Patent: March 10, 1981
    Assignee: TDK Electronics Company Limited
    Inventors: Toshihiro Hamabata, Shinji Umeki
  • Process for producing sintered body of ceramic composition for voltage non-linear resistor
    Patent number: 4254070
    Abstract: A sintered body of a ceramic composition for voltage non-linear resistor is produced by sintering an oxide semiconductor composition comprising a main component of zinc oxide and a minor component at 1100.degree. to 1400.degree. C.; then maintaining the sintered body in an inert gas such as N.sub.2, Ar and so on having an oxygen content of 0.1 to 21 vol. % at the temperature lower than the sintering temperature for a specific time; changing the atmosphere into an inert gas having an oxygen content of lower than 0.02 vol. % at 800.degree. to 1200.degree. C.; and cooling it.
    Type: Grant
    Filed: October 30, 1979
    Date of Patent: March 3, 1981
    Assignee: TDK Electronics Company, Limited
    Inventors: Masatada Yodogawa, Matsuo Morisawa, Takashi Yamamoto, Katsunobu Okutani
  • Process for producing acicular goethite
    Patent number: 4251504
    Abstract: An alkali hydroxide is added to an aqueous solution of ferrous salt to form a precipitate and a part of the solution is separated to control a ratio of an anion to a ferrous component to less than 1 and the ferrous component is oxidized to acicular goethite by bubbling air through the supernatant and precipitate.
    Type: Grant
    Filed: September 20, 1979
    Date of Patent: February 17, 1981
    Assignee: TDK Electronics, Co. Ltd.
    Inventors: Toshihiro Hamabata, Shinji Umeki
  • Process for preparing insoluble electrode
    Patent number: 4248906
    Abstract: An insoluble electrode for electrolysis is prepared by coating a solution or slurry comprising palladium oxide and a platinum compound which can be thermally decomposed to form platinum metal, and optionally another salt or oxide, on a conductive substrate and drying it and baking it at elevated temperature.
    Type: Grant
    Filed: September 28, 1979
    Date of Patent: February 3, 1981
    Assignee: TDK Electronics Company, Limited
    Inventors: Shunjiro Saito, Saburo Ishibashi, Nobuei Shimojo
  • Process for preparing magnetic powder
    Patent number: 4248907
    Abstract: A magnetic powder is prepared by dispersing iron oxide or iron oxide hydrate which can be coated or doped with at least one of cobalt, nickel, tin, titanium, bismuth, zinc or antimony or its compound, as the starting material into an aqueous solution of a water soluble resin and separating the powder and heating it in a reducing atmosphere to reduce it.
    Type: Grant
    Filed: July 25, 1979
    Date of Patent: February 3, 1981
    Assignee: TDK Electronics Company, Limited
    Inventors: Tatsuo Uehori, Ryouichi Horiboto
  • High gradient magnetic separation apparatus
    Patent number: 4247398
    Abstract: Disclosed herein is a high gradient magnetic separation (HGMS) apparatus, in which ferromagnetic metal wool is used to separate, for example, iron powders from water. Due to the high magnetic gradient around the metal wool, the separation of the iron powders takes place. Because of an improvement of the metal wool used in this HGMS apparatus, iron powders and the like can be collected at a high collecting efficiency, and the renewal operation of the metal wool can be performed in a short period of time. The improvement according to the invention resides in employing an amorphous metal alloy for the metal wool.
    Type: Grant
    Filed: October 29, 1979
    Date of Patent: January 27, 1981
    Assignee: TDK Electronics Co., Ltd.
    Inventor: Kaneo Mohri
  • Color image pick-up system for a color television system
    Patent number: 4246600
    Abstract: A color image pickup system for a color television system comprises a single image pickup device, a color filter mounted in front of the screen of said image pickup device, said color filter having an array of the repetition of a pair of horizontal colored belts or scanning lines, the first scanning line having an arrangement of cells of the three elementary colors, the second scanning line having an arrangement of the complementary elementary colors to those of the first scanning line. Thus, the colors of each pair of cells in the vertical direction of the two scanning lines are complementary. The output of the image pickup device is processed by adding the signals of the first scanning line and the second scanning line for every vertical cell to provide a brightness signal(Y). As a color signal, only the first scanning line is selected and a pair of color cells (red and blue) are sampled.
    Type: Grant
    Filed: March 5, 1979
    Date of Patent: January 20, 1981
    Assignees: TDK Electronics Company Limited, Olympus Optical Co., Ltd.
    Inventors: Shiro Nakagawa, Kiyoshi Matsui
  • Heating element made of PTC ceramic material
    Patent number: 4245146
    Abstract: Disclosed herein is a heating element for an air heater and the like comprising a ceramic material in the form of a honeycomb as well as the process for producing the ceramic material. The heating element is characterized by its relatively high amount of heat generation capability compared to a conventional heating element of the same size. Preferable ceramic materials for the heating element have a temperature coefficient of electrical resistance of from 5 to 20%/.degree.C., and consist essentially of from 38.7 to 47.3 molar % of BaO, from 2.5 to 11 molar % of PbO, from 49.8 to 50% of TiO.sub.2, from 0.05 to 0.3 molar % of a semiconductor forming element and from 0.002 to 0.015 part by weight of Mn.
    Type: Grant
    Filed: March 2, 1978
    Date of Patent: January 13, 1981
    Assignee: TDK Electronics Company Limited
    Inventors: Ryoichi Shioi, Kazumasa Umeya, Kazunari Yonezuka, Hisao Senzaki
  • Magnetic recording medium
    Patent number: 4241139
    Abstract: A magnetic recording medium which has a protective layer on a magnetic recording layer coated on a substrate and said protective layer comprises polyurethane and nitrocellulose in which isopropyl alcohol originally present has been replaced by a resin selected from the group consisting of polyurethane resins, polybutadiene resins, butadiene-acrylonitrile copolymers, vinyl chloride-vinyl acetate-vinyl alcohol copolymers, vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinylidene chloride copolymers, vinylidene chloride-acrylonitrile-copolymers, vinyl acetate resins, epoxy resins, phenoxy resins, polyvinylbutyral resins, polyvinyl formal resins and polyester resins.
    Type: Grant
    Filed: April 5, 1979
    Date of Patent: December 23, 1980
    Assignees: TDK Electronics Co., Ltd., Tokyo Magnetic Printing Co., Ltd.
    Inventors: Yuichi Kubota, Tsunayoshi Saito, Yoshiaki Makino
  • Drop-out detecting system for video recording magnetic tape
    Patent number: 4238777
    Abstract: A drop-out on an oblique video channel of a video recording magnetic tape is recognized by marking a signal on the voice channel relating to that drop-out. The marking signal on the voice channel is positioned on the line perpendicular to the moving direction of the tape, and the drop-out resides on said line. After developing the tape thus marked, the mark is first visually recognized, and the corresponding drop-out is detected also visually on said line.
    Type: Grant
    Filed: August 22, 1979
    Date of Patent: December 9, 1980
    Assignee: TDK Electronics Company Limited
    Inventors: Akira Okada, Yoshio Mikame, Ryoiti Aizawa
  • Magnetic recording medium
    Patent number: 4238548
    Abstract: A magnetic recording medium comprises a substrate coated with a magnetic layer wherein a magnetic powder is orientated in a cured binder comprising a vinyl chloride, vinyl acetate copolymer having more than 10 wt. % of vinyl alcohol component and a polyester and a nitrocellulose.
    Type: Grant
    Filed: March 6, 1979
    Date of Patent: December 9, 1980
    Assignee: TDK Electronics Company Limited
    Inventors: Kiyotaka Okuyama, Akihiko Hosaka
  • High dielectric constant type ceramic composition
    Patent number: 4235635
    Abstract: A novel ceramic composition exhibiting a solid solution structure of Pb(Fe.sub.2/3 W.sub.1/3)O.sub.3 --Pb(ZrO.sub.3), can be sintered at a low sintering temperature; have a high insulation resistance; have a relatively high dielectric constant in the high dielectric type ceramic dielectrics; have a low dependence of dielectric constant upon temperature, and; have a low dielectric loss.A particular amount of the additives, i.e., MnO, Pb(Mn.sub.1/3 Nb.sub.2/3)O.sub.3, Pb(Mn.sub.1/2 W.sub.1/2)O.sub.3, Pb(Mn.sub.2/3 W.sub.1/3)O.sub.3, Pb(Mn.sub.1/3 Ta.sub.2/3)O.sub.3, Cr.sub.2 O.sub.3 and CeO.sub.2, is added into the composition mentioned above.
    Type: Grant
    Filed: July 26, 1979
    Date of Patent: November 25, 1980
    Assignee: TDK Electronics Co., Inc.
    Inventors: Osamu Iizawa, Shinobu Fujiwara, Hisayoshi Ueoka, Kiyoshi Furukawa, Nobuaki Kikuchi, Hitoshi Tanaka
  • Electrodes for living body
    Patent number: 4235241
    Abstract: An improved electrode for living body is proposed which is excellent in the stability and reliability in detecting and transmitting the electric signals generated in a living body by the physiological electric phenomena such as electrocardiographic, electromyographic and electroencephalographic signals.The electrode of the invention is characterized by the material which is mainly a titanium hydride or a mixture of a titanium hydride with silver chloride optionally combined with a metal salt with basicity and a carbon powder, e.g. graphite.
    Type: Grant
    Filed: September 5, 1978
    Date of Patent: November 25, 1980
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Katsuhiko Tabuchi, Toshiaki Kato
  • Magnetic recording medium
    Patent number: 4234438
    Abstract: A magnetic recording medium comprises a substrate coated with a magnetic coating composition comprising nitrocellulose impregnated with a vinyl chloride-vinyl acetate-vinyl alcohol copolymer having a content of vinyl alcohol component of 8 wt. % or more, a magnetic powder, a solvent, and a thermal crosslinking agent.
    Type: Grant
    Filed: May 10, 1979
    Date of Patent: November 18, 1980
    Assignee: TDK Electronics Company Limited
    Inventors: Eiji Horigome, Hiroshi Ota, Hitoshi Azegami
  • Process for preparing insoluble electrode
    Patent number: 4233340
    Abstract: An insoluble electrode for electrolysis which comprises repeatedly coating and baking a slurry of palladium oxide containing a platinum compound which can be thermally decomposed to form platinum metal, optionally the other metal salt or oxide in a solvent and a solution of a platinum compound which can be thermally decomposed to form platinum metal in a solvent on a conductive substrate in optional order at two or more times.
    Type: Grant
    Filed: November 21, 1978
    Date of Patent: November 11, 1980
    Assignee: TDK Electronics Company, Limited
    Inventors: Shunjiro Saito, Kazuhide Aue, Makoto Kobayashi, Akio Nakamura
  • Method of stripping a molded article
    Patent number: 4231987
    Abstract: A molding method comprises a step of fitting a movable mold to a stationary mold and filling a molten resin into a cavity formed by the mold fitting; a step of separating the movable molds; a step of releasing a molded product held by one or more push pins while shifting the push pins; a step of holding the molded product by a guide having a .]. shaped sectional view; and a step of releasing the molded product from the push pins to pass the molded product along the guide having a .]. shaped sectional view.
    Type: Grant
    Filed: July 17, 1978
    Date of Patent: November 4, 1980
    Assignee: TDK Electronics Company Limited
    Inventors: Masayuki Osawa, Masaoki Sekine
  • PTC Honeycomb heating element with multiple electrode layers
    Patent number: 4232214
    Abstract: In a honeycomb heating element comprising a PTC thermister body, a single electrode layer composed of a silver paste was conventionally used for applying power to the body. In the present invention, two or three electrode layers with improved electrical and chemical properties are used to provide the heating element with a long service life, improved reliability and a high heat generation.
    Type: Grant
    Filed: February 22, 1979
    Date of Patent: November 4, 1980
    Assignee: TDK Electronics Company Limited
    Inventors: Ryoichi Shioi, Tamotu Yamauchi
  • Tape cassette
    Patent number: 4227622
    Abstract: A tape cassette comprises an upper half casing and a lower half casing and male hollow cylindrical projections having a notch mounted on either of the upper half casing or the lower half casing and female hollow recesses mounted on the other half casing at the corresponding positions. The upper and lower half casings are superposed to fit the male hollow cylindrical projects into the corresponding female hollow recesses and are fixed together by screwing self-tap bolts from the female hollow recesses into the male hollow cylindrical projections having notches to fix the projections on the inner surfaces of the female hollow recesses.
    Type: Grant
    Filed: May 23, 1979
    Date of Patent: October 14, 1980
    Assignee: TDK Electronics Company, Limited
    Inventors: Masatoshi Okamura, Haruo Shiba, Kimio Tanaka
  • Electronic component package
    Patent number: D257716
    Type: Grant
    Filed: September 13, 1977
    Date of Patent: December 30, 1980
    Assignee: TDK Electronics Company, Limited
    Inventor: Sho Masujima
  • Video tape cassette
    Patent number: D258287
    Type: Grant
    Filed: June 5, 1979
    Date of Patent: February 17, 1981
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Hidehisa Hashimoto, Keiichi Yoshizawa