Patents by Inventor Noboru Tokumasu

Noboru Tokumasu 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).

  • Patent number: 5376591
    Abstract: A, method for forming semiconductor device, includes forming an insulating film on a body by chemical vapor deposition, at low temperature raising the temperature of, the body, and exposing the body to plasma gas.
    Type: Grant
    Filed: June 8, 1992
    Date of Patent: December 27, 1994
    Assignee: Semiconductor Process Laboratory Co., Ltd.
    Inventors: Kazuo Maeda, Noboru Tokumasu, Yuko Nishimoto
  • Patent number: 5324539
    Abstract: The present invention provides a method for forming a chemical vapor deposition film which is suitable for an interlevel insulator between Al and Al or an interlevel insulator between Al and a gate, and provides an improved chemical vapor deposition film suitable for mass production. An organic siloxane or alkoxysilane and an alkoxy compound of germanium are mixed in a vapor phase, and reacted with oxygen or ozone to thereby form a thin glass film composed of a two-component system of silicon oxide and germanium oxide on a substrate.
    Type: Grant
    Filed: December 16, 1992
    Date of Patent: June 28, 1994
    Assignees: Semiconductor Process Laboratory, Canon Sales Co., Inc., Alcan Tech. Co., Inc.
    Inventors: Kazuo Maeda, Noboru Tokumasu, Yuko Nishimoto
  • Patent number: 5314538
    Abstract: An apparatus and method for manufacturing a semiconductor device capable of forming a single layer film or a multilayer film of improved quality by continuously processing without exposure of the wafer to the ambient air. The apparatus includes a film forming section having a gas dispersion unit for supplying reaction gas, a processing section for processing the formed film and a wafer holder for holding a wafer facing the gas dispersion unit or the processing section. The wafer holder moves the wafer between the film forming section and the processing section while heating the wafer by a heating element contained therein.
    Type: Grant
    Filed: December 22, 1992
    Date of Patent: May 24, 1994
    Assignees: Semiconductor Process Laboratory, Canon Sales Co., Inc., Alcan Tech Co., Inc.
    Inventors: Kazuo Maeda, Noboru Tokumasu, Yuhko Nishimoto
  • Patent number: 5231058
    Abstract: In a process for forming a CVD film, a polysiloxane compound having at least two silicon-oxygen bonds is reacted with ozone to form an SiO.sub.2 film. If desired, the reaction may be effected in the presence of a gas containing an impurity mixed with the polysiloxane compound and ozone to form a PSG, BSG or BPSG film. In a semiconductor device, the SiO.sub.2 film, or the PSG, BSG or BPSG film is used as a planarizing film, an interlayer insulating film, or a cover insulating film.
    Type: Grant
    Filed: December 14, 1990
    Date of Patent: July 27, 1993
    Assignee: Semiconductor Process Laboratory Co. Ltd.
    Inventors: Kazuo Maeda, Noboru Tokumasu, Yuko Nishimoto
  • Patent number: 5051380
    Abstract: In a process for producing a semiconductor device, deposition of a CVD-SiO.sub.2 film at a given first O.sub.3 concentration according to a TEOS-SiO.sub.3 reaction is followed by further deposition of a CVD-SiO.sub.2 film at a second O.sub.3 concentration higher than the first O.sub.3 concentration according to the TEOS-O.sub.3 reaction to form a CVD-SiO.sub.2 film having a predetermined thickness and a surface little uneven.
    Type: Grant
    Filed: December 14, 1990
    Date of Patent: September 24, 1991
    Assignees: Semiconductor Process Laboratory Co., Ltd., Alcan-Tech Co., Inc.
    Inventors: Kazuo Maeda, Noboru Tokumasu, Yuko Nishimoto
  • Patent number: 4731255
    Abstract: A gas-phase growth process for growing films of uniform thickness or having a prescribed pattern form or growing films sequentially onto a substrate and an apparatus related thereto. The films are grown by allowing an inert gas to flow over a reaction gas flow in parallel to the surface of the substrate. Optionally, the substrate surface could be irradiated by a UV light source which is directed from above the inert gas toward the substrate surface.
    Type: Grant
    Filed: September 26, 1985
    Date of Patent: March 15, 1988
    Assignee: Applied Materials Japan, Inc.
    Inventors: Kazuo Maeda, Noboru Tokumasu, Toshihiko Fukuyama, Tsugiaki Hirata
  • Patent number: 4702936
    Abstract: A gas-phase growth process for forming a film of SiO.sub.2 Si.sub.3 N.sub.4 or Si.sub.x O.sub.y N.sub.z, which comprises reacting a mixture of an organic or inorganic silane with one or more reaction gases comprising O.sub.2, N.sub.2 O, NO.sub.2 NO, CO.sub.2 CO and NH.sub.3, with the proviso that the mixture of inorganic silane and O.sub.2 is excluded as a reaction gas combination of the present invention. The process comprises feeding a reaction gas into a reaction chamber which is kept at a reaction temperature below 500.degree. C., and subjecting the surface of a substrate chamber which is placed in the reaction chamber to UV irradiation. This irradiation excites the reaction gas, which allows a low-temperature gas-phase growth to proceed. The photo-excitation occurs selectively only at UV-irradiated sections, so that a film growth may occur selectively on the substrate surface within the range of UV irradiation.
    Type: Grant
    Filed: September 20, 1985
    Date of Patent: October 27, 1987
    Assignee: Applied Materials Japan, Inc.
    Inventors: Kazuo Maeda, Noboru Tokumasu, Toshihiko Fukuyama