Patents by Inventor Chiaki Hatsuta

Chiaki Hatsuta 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).

  • Halftone phase shifting photomask and blanks for halftone phase shifting photomask therefor and a method for forming pattern by using the halftone phase shifting photomask
    Publication number: 20020015187
    Abstract: In a halftone phase shifting photomask 108, having a pattern of halftone phase shifting film 102 containing at least chromium and fluorine, the halftone phase shifting film is heat-treated at a temperature between 250° C. and 500° C.
    Type: Application
    Filed: April 3, 2001
    Publication date: February 7, 2002
    Inventors: Toshiaki Motonaga, Norihito Ito, Chiaki Hatsuta, Junji Fujikawa, Naoya Hayashi, Toshio Onodera, Takahiro Matsuo, Toru Ogawa, Keisuke Nakazawa
  • Lead frame, method for partial noble plating of said lead frame and semiconductor device having said lead frame
    Patent number: 6034422
    Abstract: A lead frame for a semiconductor device, made of a copper alloy, capable of preventing the creation of delamination between encapsuling resin and attributable to a lead frame without sacrificing the wire bondability and, a process for producing the lead frame and a semiconductor device using the lead frame. According to the present invention, (1) there is provided a lead frame for a plastic molded type semiconductor device, made of a copper alloy material partially plated with at least one noble metal, for wire bonding or die bonding purposes, selected from silver, gold, and palladium, wherein the whole area or a predetermined area of the surface of the copper at least on its side to be contacted with a encapsuling resin has a thin noble metal plating of at least one member selected from silver, gold, platinum, and palladium.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: March 7, 2000
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Hideo Horita, Chiaki Hatsuta