Patents by Inventor Masato Tsurugasaki

Masato Tsurugasaki 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).

  • Method for etching laminated assembly including polyimide layer
    Patent number: 6783921
    Abstract: Disclosed is an etching method of a laminated assembly having a metal layer and a non-thermoplastic polyimide layer bonded together via thermoplastic polyimide, which comprises using an etchant at least containing an alkali metal hydroxide, water and oxyalkylamine, wherein the concentrations of the alkali metal hydroxide (X weight %) and of the water (Y weight %) have relationships represented by coordinate points present within a region (inclusive of boundary lines) defined by the following expressions [1] and [2]: Y=(½)X (provided that 7≦X≦45)  [1] Y=({fraction (5/20)})X+17.5 (provided that 7≦X≦45)  [2] provided that X and Y are defined based on the total weight of the alkali metal hydroxide, water and oxyalkylamine expressed as 100.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: August 31, 2004
    Assignees: Sumitomo Electric Industries, Ltd., Fuchigami Micro Co., Ltd.
    Inventors: Shingo Kaimori, Tsuyoshi Nonaka, Satoshi Koshimuta, Masato Tsurugasaki
  • Method for etching laminated assembly including polyimide layer
    Publication number: 20030054293
    Abstract: Disclosed is an etching method of a laminated assembly having a metal layer and a non-thermoplastic polyimide layer bonded together via thermoplastic polyimide, which comprises using an etchant at least containing an alkali metal hydroxide, water and oxyalkylamine, wherein the concentrations of the alkali metal hydroxide (X weight %) and of the water (Y weight %) have relationships represented by coordinate points present within a region (inclusive of boundary lines) defined by the following expressions [1] and [2]:
    Type: Application
    Filed: January 31, 2002
    Publication date: March 20, 2003
    Inventors: Shingo Kaimori, Tsuyoshi Nonaka, Satoshi Koshimuta, Masato Tsurugasaki