Patents Assigned to Tokyo Gas Company Limited
  • Patent number: 5916538
    Abstract: The present invention relates to a method of diagnosing diabetes, which comprises administering a diagnostic agent comprising glucose labeled with .sup.13 C at a specific position, or pyruvic acid labeled with .sup.13 C in at least one specific position. According to the present invention, there is provided a method of diagnosing diabetes by administering a diagnostic agent which can be used safely without side effects to give accurate results immediately with less physical pains on the subject. The present method of diagnosing diabetes can distinguish between healthy persons and patients with diabetes even under the circumstances where the patients are easily missed, and further it can determine the type of diabetes (insulin-dependent type or insulin-independent type).
    Type: Grant
    Filed: August 26, 1997
    Date of Patent: June 29, 1999
    Assignee: Tokyo Gas Company Limited
    Inventors: Tadashi Kohno, Isaburo Hosoi, Junko Ohshima, Kunihiko Shibata
  • Patent number: 5894819
    Abstract: A water tube boiler using jet flames is disclosed which is capable of achieving low CO-emission combustion without enlarging a size of a combustion chamber. The water tube boiler comprises a combustion chamber 1 in which jet flames are generated and rows 3a to 3e of water tubes inserted through the combustion chamber. The group of water tubes provides a portion thick with the water tubes and a portion empty of the water tubes in a cross-section perpendicular to the direction of the jet flames, and at least the space Sa as an empty portion continuously extends through said group of water tubes in the direction of the jet flames. In the space Sa as an "empty" portion provided between the rows 3b and 3d of water tubes, recirculating flows (shown by arrows) of a combustion gas are generated. The recirculating flows are entrained by the jet flames existing the portion "thick" with the water tubes. Consequently, rapid temperature decrease of the jet flames is prevented.
    Type: Grant
    Filed: November 18, 1996
    Date of Patent: April 20, 1999
    Assignee: Tokyo Gas Company Limited
    Inventor: Toru Motegi
  • Patent number: 5510523
    Abstract: A process for preparing acetic acid from methanol and carbon monoxide or a mixed gas of carbon monoxide with hydrogen, which process comprises contacting methanol with a gaseous component selected from a group consisting of carbon monoxide and a mixed gas of carbon monoxide with hydrogen of 2% by volume or less in the presence of a carbon-supported rhodium metal catalyst and methyl iodide promoter in vapor phase under the conditions of a reaction temperature of 180.degree.-220.degree. C., a reaction pressure of 5-10 kg/cm.sup.2 .multidot.G, and a weight of catalyst to feed gas flow rate ratio (W/F) of 10-20 g.multidot.h/mole; and a process for preparing acetic acid from methanol and carbon monoxide, which process comprises contacting methanol with carbon monoxide in the presence of a carbon-supported rhodium metal catalyst, methyl iodide promoter and water in vapor phase.
    Type: Grant
    Filed: June 19, 1992
    Date of Patent: April 23, 1996
    Assignee: Tokyo Gas Company, Limited
    Inventors: Kenichi Yamaseki, Yasuo Konishi, Hiroshi Uchida
  • Patent number: 5318438
    Abstract: A small combustion apparatus for domestic or commercial use, wherein the quantity of combustion is increased by enhancing the mounting density of the burner units and to stabilize combustion using a lean fuel mixture resulting in a decreased generation of nitrogen oxides and noise. The burner has first and second burner units, arranged alternatively adjacently to one another. Each of the burner units has a flame port portion at the top of the burner body vertical and flat, has an inlet for fuel gas and air at the bottom of the burner body, has a mixing channel extending from the inlet to the flame port portion; and has inlets of the first burner units located below the inlets of the second burner units fuel gas spouts, are provided to correspond to the respective inlets of the first and second burner units.
    Type: Grant
    Filed: September 24, 1992
    Date of Patent: June 7, 1994
    Assignees: Tokyo Gas Company Limited, Takagi Industries Co., Ltd.
    Inventors: Tatsuya Sugahara, Takao Takagi, Kimio Mochizuki, Shigetoshi Akiyama
  • Patent number: 5298886
    Abstract: In a fluidic flowmeter for measuring the flowrate higher than the preset flowrate by use of a fluidic element and for measuring the flowrate lower than the present flowrate by use of a flow sensor inserted into the nozzle portion, the present invention relates to the fluidic flowmeter that has an abnormality judging circuit for judging an abnormality and issuing a warning signal and also zero point and gain correcting circuits when operating the flowrate on the basis for the signal being output from the flow sensor in the case that the flowrate signal higher than the preset flowrate is to be input only from the flow sensor side and in the case that the flowrate signal higher than the preset flowrate is to be input only from the flow sensor side and in the event that the flowrate signal lower than the preset flowrate is to be input only from the fluidic element side.
    Type: Grant
    Filed: June 13, 1991
    Date of Patent: March 29, 1994
    Assignee: Tokyo Gas Company Limited
    Inventors: Takashi Ueki, Katsuhito Sakai, Takeshi Abe
  • Patent number: 5218872
    Abstract: A fluidic flowmeter is located downstream of a valve. A wire gauze or net having small meshes is located on the upstream side of a nozzle forming the inlet to the fluidic element to stabilize flow.
    Type: Grant
    Filed: June 17, 1991
    Date of Patent: June 15, 1993
    Assignees: Tokyo Gas Company Limited, Aichi Tokei Denki Co., Ltd., Kimmon Manufacturing Co., Ltd.
    Inventors: Tatsuo Hattori, Takashi Ueki, Katsuhito Sakai, Toshiki Ishikawa, Yukihiro Niimi, Hideyuki Ochi
  • Patent number: 5157974
    Abstract: The flowrate of fluid to be measured, that flows into the nozzle of a fluidic oscillator is stabilized by fitting flow adjusting plates on the upstream side of the nozzle.
    Type: Grant
    Filed: June 24, 1991
    Date of Patent: October 27, 1992
    Assignee: Tokyo Gas Company, Limited
    Inventors: Tatsuo Hattori, Takashi Ueki, Katsuhito Sakai, Toshiki Ishikawa, Yukihiro Niimi
  • Patent number: 5049066
    Abstract: A burner for mixing and burning a gaseous fuel includes an inner pipe, carrying the gaseous fuel, and an outer pipe, carrying combustion air in the annular space between the inner and outer pipes. A cone-shaped horn is affixed to the end of the inner pipe. The horn extends near the inner surface of the outer pipe, leaving a narrow annular space therebetween. An alternating series of air jetting portions and blind portions around the periphery of the large end of the horn encourage the formation of mixing vortices as air passes through the air jetting portions. A plurality of radially directed fuel jetting openings in the inner pipe, upstream of the horn, inject gaseous fuel into the combustion air to form a lean air-fuel mixture. A plurality of jet openings at the end of the inner pipe, within the horn, direct gaseous fuel generally parallel to the diverging wall of the horn.
    Type: Grant
    Filed: October 23, 1990
    Date of Patent: September 17, 1991
    Assignee: Tokyo Gas Company Limited
    Inventors: Kazuo Kaiya, Toshimitsu Ido
  • Patent number: 4945841
    Abstract: A furnace and burner construction and method of burning fuel therein. The furnace housing has an end wall and side walls extending generally perpendicularly from the end wall and defining a furnace interior. One or more air supply ports open axially thereof through the end wall, and at least one fuel supply port opens axially thereof through the end wall and is spaced from the air supply port or ports. The air supply port is spaced from the side walls. When generally conical surfaces of jets of fuel and air are injected into the interior of the furnace through the air supply port or ports and the fuel supply port for carrying out burning of the fuel, recirculating currents of combustion products from the burning of the fuel are formed in the space between the jets and the side walls or between the jets themselves to lower the temperature of the burning.
    Type: Grant
    Filed: May 18, 1989
    Date of Patent: August 7, 1990
    Assignee: Tokyo Gas Company Limited
    Inventors: Ichiro Nakamachi, Kunio Yasuzawa, Tadato Miyahara, Takahiro Nagata
  • Patent number: 4645125
    Abstract: A transport mechanism for heat in housing includes the use of liquid media such as warm water and gaseous media such as heated air. For either of these heat transport media, a circulation pump or a blower is necessary with the exception of special cases. This invention relates to a heat transport method where the heat media is evaporated by a steam generator which is fed up to an objective heat emitting device through steam tubes. At this heat emitting device, the steam is condensed for utilization of the latent heat being obtained by this condensation to space heating, water heating and so on. Further, the condensed heat media liquid is once stored in a condensed liquid vessel which is under atmospheric pressure, and the heat media liquid inside the condensed liquid vessel is circulated into the steam generator via steam tubes by stopping the heating of the steam generator and utilizing the pressure reduction being caused inside the steam generator.
    Type: Grant
    Filed: March 5, 1985
    Date of Patent: February 24, 1987
    Assignee: Tokyo Gas Company Limited
    Inventor: Toshiaki Omori
  • Patent number: 4021188
    Abstract: Burner arrangements for staged combustion to decrease nitrogen oxides (NOx) during the combustion of hydrocarbon fuel with air. The burner arrangements have a combustion into which hydrocarbon fuel and less than 70% of the stoichiometric air are introduced, and a path for the secondary air around the combustion chamber. A flame holding means is provided in one end of the combustion chamber to stabilize the substoichiometric combustion so that a partially burned gas containing mainly H.sub.2 and CO as combustible components is obtained. The combustion chamber has an exit, and there is an exit from the secondary air path near the exit of the combustion chamber. A discharging means for the partially burned gas is provided at the exit of the combustion chamber to vary the pattern of the flow of said partially burned gas by converting the enthalpy of said partially burned gas into kinetic energy.
    Type: Grant
    Filed: August 21, 1975
    Date of Patent: May 3, 1977
    Assignee: Tokyo Gas Company Limited
    Inventors: Kazuo Yamagishi, Ichiro Nakamachi, Masaaki Nozawa, Tsunenori Tokumoto, Shoichi Yoshie, Yasuo Kakegawa, Isamu Kikuchi, Yoshihisa Iseda, Yoshihiro Kanno, Sadanori Yamazaki, Masanobu Sato
  • Patent number: 4015436
    Abstract: A method of controlling the capacity of a gas blower for pumping gas at a given discharge pressure involving cooling the gas at the suction side of the blower. The method is especially useful for controlling the pressure in a liquefied gas storage tank so as to maintain it substantially constant. The boil-off gas in the tank is exhausted by a gas blower and liquefied gas is injected into the boil-off gas exhausted from the tank at a point on the suction side of the blower for cooling the boil-off gas exhausted from the tank prior to its being pumped by the blower. The amount of liquefied gas injected into the boil-off gas is proportional to the pressure of the boil-off gas in the storage tank.
    Type: Grant
    Filed: July 30, 1975
    Date of Patent: April 5, 1977
    Assignee: Tokyo Gas Company Limited
    Inventor: Masao Seki
  • Patent number: 4010013
    Abstract: Equipment for treating waste gas containing tar mist is constituted by bag houses having bag filters therein and in which a filter cleaning apparatus for each filter is installed, respectively, a conducting duct for waste gas containing tar mist connected to each bag house and equipped with a shut-off valve, respectively, a discharging duct for treated waste gas and a supply tube for supplying protective coating material which is caused to form a precoated layer on the surface of the bag filter. The efficiency of the waste gas treatment is improved by the action of the precoated layer in inhibiting the direct contact of tar mist with the bag filter.
    Type: Grant
    Filed: May 28, 1975
    Date of Patent: March 1, 1977
    Assignees: Taisei Kensetsu Kabushiki Kaisha, Tokyo Gas Company Limited
    Inventor: Takao Murayama