Patents by Inventor Makoto Kumada

Makoto Kumada 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 DTMF transfer by RTP
    Patent number: 7778243
    Abstract: A method for DTMF transmission between different address systems in a communication system containing a first network (NW) 20A including an SIP terminal 41A connected to an SIP server 30A, a second network (NW) 20B including an SIP terminal 41B connected to an SIP server 30B, and an SIP converter 10 connecting the first and the second NWs. When the SIP converter 10 detects coded DTMF information from one of the NWs while a session is established between the SIP terminal 41A and the SIP terminal 41B, the SIP converter 10 determines whether the other of the NWs supports the coded DTMF information. If the other of the NWs does not support the coded DTMF information, the SIP converter 10 stores voice-data DTMF corresponding to the coded DTMF information into a payload of RTP and transfers the information to the SIP terminal of the other network.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: August 17, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Yoshie Yamaguchi, Masahito Hirokawa, Makoto Kumada, Yusuke Sato, Masayuki Ono
  • Method for DTMF transfer by RTP
    Publication number: 20060120344
    Abstract: A method for DTMF transmission between different address systems in a communication system containing a first network (NW) 20A including an SIP terminal 41A connected to an SIP server 30A, a second network (NW) 20B including an SIP terminal 41B connected to an SIP server 30B, and an SIP converter 10 connecting the first and the second NWs. When the SIP converter 10 detects coded DTMF information from one of the NWs while a session is established between the SIP terminal 41A and the SIP terminal 41B, the SIP converter 10 determines whether the other of the NWs supports the coded DTMF information. If the other of the NWs does not support the coded DTMF information, the SIP converter 10 stores voice-data DTMF corresponding to the coded DTMF information into a payload of RTP and transfers the information to the SIP terminal of the other network.
    Type: Application
    Filed: August 31, 2005
    Publication date: June 8, 2006
    Inventors: Yoshie Yamaguchi, Masahito Hirokawa, Makoto Kumada, Yusuke Sato, Masayuki Ono
  • Coolant and machining device utilizing same
    Publication number: 20040159822
    Abstract: A coolant in a state of solution in which a water-soluble substance is dissolved is further included a sodium nitrite as additive by an amount of not less than 0.345 weight % for preventing crevice corrosion from causing particularly to a machining device such as machining center.
    Type: Application
    Filed: August 20, 2003
    Publication date: August 19, 2004
    Inventors: Takeki Shirai, Hidekazu Michioka, Yuuichi Katayama, Shigetoshi Kobuchi, Makoto Kumada
  • Method of forming air layer over immersed surfaces of structure having immersed portions, and structure of coat layer formed over immersed surfaces
    Patent number: 5476056
    Abstract: The present invention provides a method of reducing the fluid friction drag of ships and fluid transport channels and prevent contamination and corrosion of a structure having an immersed portion. The method of forming an air layer over an immersed surface of a structure having an immersed portion, comprising the steps of: covering the immersed surface of a structure (hull 1) having an immersed portion with a coating layer 3, which has depressions 6 and projections 7 at the surface thereof and which has at least vertices 7' of the projections 7 formed of a water-repellent material 8; and supplying air a to the surface 10 of the coating layer to form an air film 12 between the coating surface 10 and water 13.
    Type: Grant
    Filed: July 12, 1994
    Date of Patent: December 19, 1995
    Assignee: Mitsui Engineering & Shipbuilding Co., Ltd
    Inventors: Junichiro Tokunaga, Makoto Kumada, Yoichi Sugiyama, Nobuatsu Watanabe, Yong B. Chong, Naoki Matsubara
  • Photo and radiation-sensitive organopolymeric material
    Patent number: 4544729
    Abstract: A photo and radiation sensitive-organopolymeric material having at least one Si--Si).sub.n bond, wherein n is an integer of from 1 to 5 has a good resistance to dry etching, a good adhesion and a good heat resistance and is useful for finer patterning with a good resolution.
    Type: Grant
    Filed: June 22, 1984
    Date of Patent: October 1, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Kazuo Nate, Takashi Inoue, Hitoshi Yokono, Mitsuo Ishikawa, Makoto Kumada