Patents by Inventor Junjiro Takekawa

Junjiro Takekawa 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).

  • Rocket combustion chamber cooling wall of composite cooling type and method of manufacturing the same
    Patent number: 4703620
    Abstract: In the cooling wall of a regenerative cooling rocket combustion chamber, the throat portion thereof in which the heat load is highest is formed of a porous material having a perspiring cooling action. The other portion in which the heat load is relatively low is designed to be cooled by conventional forced convection. By such a composite cooling system, a high cooling effect is provided and yet the pressure loss in the cooling passages is small and light weight and long life of the engine are attained concurrently.
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: November 3, 1987
    Assignee: The Director of National Aerospace Laboratory of Science and Technology Agency, Shun Takeda
    Inventors: Masayuki Niino, Nobuyuki Yatsuyanagi, Akiraga Kumakawa, Akio Suzuki, Hiromi Gomi, Hiroshi Sakamoto, Masaki Sasaki, Yoshimichi Masuda, Ryuzo Watanabe, Junjiro Takekawa, Etsuo Ohtsuki, Terashi Isago
  • Method of producing rocket combustors
    Patent number: 4584171
    Abstract: A method of producing rocket combustors wherein in forming an outer cylin by a powder metallurgical method on the outer side of a cylinder provided on its outer periphery with a cooling wall of channel construction having a plurality of grooves, a low-melting alloy is used as a filler to be filled into the grooves. It is also possible to form the outer cylinder after forming a Cu plating shell on the periphery of the inner cylinder filled with the low-melting alloy.
    Type: Grant
    Filed: September 21, 1984
    Date of Patent: April 22, 1986
    Assignees: National Aerospace Laboratories of Science & Technology Agency, Yoshimichi Masuda, Ryuzo Watanabe, Junjiro Takekawa, Sumitomo Electric Industries
    Inventors: Masayuki Niino, Nobuyuki Yatsuyanagi, Akinaga Kumakawa, Akio Suzuki, Masaki Sasaki, Hiromi Gomi, Hiroshi Sakamoto, Yoshimichi Masuda, Ryuzo Watanabe, Junjiro Takekawa, Yoshihiko Doi, Nobuhito Kuroishi, Yoshinobu Takeda, Shigeki Ochi
  • Method of producing rocket combustors
    Patent number: 4582678
    Abstract: A method of producing rocket combustors wherein in forming an outer cylin by a powder metallurgical method on the outer side of a cylinder provided on its outer periphery with a cooling wall of channel construction having a plurality of grooves (14), an Ni electroforming layer is formed on the outer side of the outer cylinder, and also a method of producing rocket combustors wherein an outer cylinder is of multilayer construction having two or more layers.
    Type: Grant
    Filed: September 21, 1984
    Date of Patent: April 15, 1986
    Assignees: National Aerospace Laboratories of Science & Technology Agency, Yoshimichi Masuda, Ryuzo Watanabe, Junjiro Takekawa, Sumitoro Electric Industries, Ltd.
    Inventors: Masayuki Niino, Akio Suzuki, Nobuyuki Yatsuyanagi, Akinaga Kumakawa, Masaki Sasaki, Hiroshi Tamura, Fumiei Ono, Yoshimichi Masuda, Ryuzo Watanabe, Junjiro Takekawa, Yoshihiko Doi, Nobuhito Kuroishi, Yoshinobu Takeda, Shigeki Ochi
  • Method of manufacturing a rocket combustion chamber
    Patent number: 4508680
    Abstract: The present invention is directed particularly to an improved method using owder metallurgy for the manufacture of the grooved cooling wall of a liquid-propellant rocket combustion chamber. The surface of an inner cylinder constituting the cooling wall is formed with cooling grooves, and these grooves are densely filled up with a filler such as paraffin wax. Thereafter, metal powder which will provide an outer cylinder is compression-molded to a predetermined thickness around the inner cylinder. This metal powder is the same material as the material of the inner cylinder. After the paraffin wax which is the filler is evaporated and removed, the compression-molded metal powder body is sintered in a furnace. During this sintering heat treatment, the inner and outer cylinders are rigidly joined together by the sintering reaction between the atoms of the inner cylinder and the atoms of the metal powder.
    Type: Grant
    Filed: June 1, 1983
    Date of Patent: April 2, 1985
    Assignee: National Aerospace Laboratory of Science and Technology Agency
    Inventors: Masayuki Niino, Nobuyuki Yatsuyanagi, Akinaga Kumakawa, Akio Suzuki, Hiromi Gomi, Hiroshi Sakamoto, Masaki Sasaki, Yoshimichi Masuda, Ryuzo Watanabe, Junjiro Takekawa, Etsuo Ohtsuki, Terashi Isago