Patents Assigned to Eastern Co., Ltd.
  • Patent number: 5714013
    Abstract: The present invention relates to a method of infusing coloration in solder to facilitate inspection of soldered portions in the production of electronic machinery, equipment and apparatus, and further, a method of forming a colored membrane on the surface of the soldered portions by employing colored solder materials. Physically and chemically stable colored powders composed of rare earth compounds or metallic fluoride compounds, having properties of specific gravity lighter than that of solder and further being indecomposable even at a temperature higher than that of the melting points of solders, are mixed into flux. After soldering by employing solder cream containing the mixture, a colored membrane or layer may be formed on the surface of soldered portions by deposition of the colored powder compounds.
    Type: Grant
    Filed: July 29, 1996
    Date of Patent: February 3, 1998
    Assignees: Eastern Co., Ltd., Tadashi Utsunomiya, Kazuchika Ohta
    Inventors: Kazuchika Ohta, Tsuyoshi Komatsu
  • Patent number: 5650020
    Abstract: The present invention relates to a method of infusing coloration in solder to facilitate inspection of soldered portions in the production of electronic machinery, equipment and apparatus, and further, a method of forming a colored membrane on the surface of the soldered portions by employing colored solder materials.Physically and chemically stable colored powders composed of rare earth compounds or metallic fluoride compounds, having properties of specific gravity lighter than that of solder and further being indecomposable even at a temperature higher than that of the melting points of solders, are mixed into flux. After soldering by employing solder cream containing the mixture, a colored membrane or layer may be formed on the surface of soldered portions by deposition of the colored powder compounds.
    Type: Grant
    Filed: November 16, 1994
    Date of Patent: July 22, 1997
    Assignees: Eastern Co., Ltd., Tadashi Utsunomiya, Kazuchika Ohta
    Inventors: Kazuchika Ohta, Tsuyoshi Komatsu
  • Patent number: 5352325
    Abstract: The present invention is a method of forming micro through holes in printed wiring board substrate materials by means of chemical etching.In a typical printed wiring board substrate material consisting of a resinous dielectric base material, (which may or may not incorporate glass fibers), clad on both sides by a conductive layer, after the dielectric material in specific locations where through holes are to be formed is exposed by typical processes in which the conductor layer is selectively removed by etching, said exposed dielectric material is first softened, then removed by chemical etching involving several steps and procedures as well as a variety of chemical solutions, under vibratory agitation, forming through holes in said locations of 100 microns diameter or less.
    Type: Grant
    Filed: July 28, 1993
    Date of Patent: October 4, 1994
    Assignee: Eastern Co., Ltd.
    Inventor: Yoji Kato
  • Patent number: 5110916
    Abstract: The present invention discloses lanthanide series bisphthalocyanine complex compounds, wherein chemically and thermally stable side chains effective for the development of a functional film due to generation of solubility and liquid crystallization in a solvent.The compounds according to the present invention having no reacting positions at side chains thereof possess electrochromic properties and further possess excellent electrochemical characteristics. Moreover, these compounds are soluble in a solvent and show discotic liquid crystal phase. Therefore, these compounds are very effective for the development of a functional film.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: May 5, 1992
    Assignees: Eastern Co., Ltd., Iwawo Yamamoto
    Inventors: Iwao Yamamoto, Kazuchika Ohta, Tsuyoshi Komatsu
  • Patent number: 5062990
    Abstract: Octasubstituted tetraphyrazinotetraazaporphrazine and compositions forming an electron acceptable discotic liquid crystal phase are disclosed. Said compounds and the metal complexes are easily soluble in an organic solvent such as chloroform or dichloromethane etc and are insoluble in acetone and alcohols; and therefore a columnar phase by silica gel/dichloromethane, recrystallization from tetra-hydrofuran or refining through solid liquid extraction by acetone is possible. Furthermore, stability in a giant molecular can be expected and a functional membrane can be formed by a solution cast method etc., thereby employing as an electon or photoelectron material or an indication element.
    Type: Grant
    Filed: December 27, 1989
    Date of Patent: November 5, 1991
    Assignees: Eastern Co., Ltd., Iwawo Yamamoto
    Inventors: Iwawo Yamamoto, Kazuchika Ohta