Patents by Inventor Nobuyoshi Yokoyama

Nobuyoshi Yokoyama 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).

  • Publication number: 20200112146
    Abstract: A spark plug according to one embodiment of the present invention includes an insulator formed of an alumina-based sintered body, wherein the insulator contains 90 wt % or more of an aluminum component in terms of oxide, and wherein crystal grains of the insulator has an average grain size of 1.5 mm or smaller and a grain size standard deviation of 1.2 ?m or smaller.
    Type: Application
    Filed: September 18, 2019
    Publication date: April 9, 2020
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Yutaka Yokoyama, Nobuyoshi Araki, Kuniharu Tanaka, Haruki Yoshida, Hironori Uegaki, Toshiki Kon, Yusuke Nomura
  • Patent number: 5819638
    Abstract: A deep-frying apparatus includes an oil tank for holding cooking oil in which food is fried and a heating device for heating the oil. The oil tank includes a cooking zone in the upper portion of the tank and a cold zone in the lower portion of the tank. An air passage is located in the cold zone for cooking the oil in the cold zone and for providing heated combustion air to the heating device.
    Type: Grant
    Filed: July 9, 1997
    Date of Patent: October 13, 1998
    Assignee: Paloma Industries, Ltd.
    Inventor: Nobuyoshi Yokoyama
  • Patent number: 5261322
    Abstract: The present invention provides an improved fryer apparatus including a small size pulse combustor and an additional labor-saved function such as a filtering system or a lift system. The pulse combustor of the invention does not include a check valve or flapper valve for preventing back flow of combustion exhaust in an air supply system. This valve-free structure of the pulse combustor allows sufficient noise reduction without any silence or muffler and makes a free space for the filtering system or the lift system.
    Type: Grant
    Filed: February 9, 1993
    Date of Patent: November 16, 1993
    Assignee: Paloma Kogyo Kabushiki Kaisha
    Inventors: Nobuyoshi Yokoyama, Susumu Eijiri
  • Patent number: 5220864
    Abstract: The invention realizes pulse combustion with a great turn down ratio, which is applicable to various controls and regulations in a noodle cooker. The noodle cooker of the invention heats water in a pot using a pulse combustor, which does not have a check valve for preventing back flow of combustion exhaust in its air supply system. A controller of the pulse combustor regulates the opening angle of a proportional electromagnetic valve for fuel supply and the rotating speed of a fan for air supply based on the water temperature detected by a temperature sensor and keeps the water temperature in the pot in a predetermined optimal range.
    Type: Grant
    Filed: September 9, 1992
    Date of Patent: June 22, 1993
    Assignee: Paloma Kogyo Kabushiki Kaisha
    Inventors: Susumu Ejiri, Nobuyoshi Yokoyama
  • Patent number: 5044928
    Abstract: In a pulse combustion device including a combustion chamber having a cylindrical wall, a forward end wall secured to one end of the cylindrical wall for attachment with a liquid vessel and being formed with an inlet port to be supplied with a mixture of gaseous fuel and air, and a rearward end wall secured to the other end of the cylindrical wall to close the combustion chamber, the cylindrical wall of the combustion chamber is formed with a plurality of circumferentially equally spaced radial exhaust ports which are located respectively in a position displaced from the center of the combustion chamber in an axial direction toward the inlet port, and a plurality of tailpipes are radially inwardly bent at their one ends and secured to the exhaust ports of the combustion chamber.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: September 3, 1991
    Assignee: Paloma Kogyo Kabushiki Kaisha
    Inventors: Nobuyoshi Yokoyama, Susumu Ejiri
  • Patent number: 5038753
    Abstract: In a liquid heating apparatus of the pulse combustion type, a mounting plate is secured to a side wall of a liquid vessel for supporting thereon an air-fuel mixer head outside the vessel and a combustion chamber inside the vessel, and an inlet pipe is secured at its inner end to a front end wall of the combustion chamber and extended outwardly from the vessel through the mounting plate. The air-fuel mixer head is mounted to an outer end of the inlet pipe at a position spaced from the mounting plate, and the combustion chamber is supported by the inlet pipe at a position spaced from the mounting plate. During pulse combustion, the inlet pipe is cooled by the liquid flowing into the space between the front end wall of the combustion chamber and the mounting plate to protect the mixer head from the heat of high temperature transmitted thereto from the combustion chamber.
    Type: Grant
    Filed: February 9, 1990
    Date of Patent: August 13, 1991
    Assignee: Paloma Kogyo Kabushiki Kaisha
    Inventors: Nobuyoshi Yokoyama, Susumu Ejiri
  • Patent number: 5020987
    Abstract: In a pulse combination device including a housing forming therein a combustion chamber, a cylindrical support member joined to the housing to form a mixing chamber in open communication with the combustion chamber, a perforated end wall member coupled with an open end of the support member to permit inward flow of the air passing therethrough into the mixing chamber, a cylindrical member mounted in the center of the end wall member to form therein a gas passage in open communication with the mixing chamber, an annular plate formed with a plurality of air inlet ports and being secured to annular end surfaces of the end wall member and the cylindrical member, a shroud housing assembly arranged to form therein an air intake chamber in open communication with the inlet ports through the perforated end wall member, and a blower arranged to forcibly supply the air into the air intake chamber, a deflector plate is mounted in place in the mixing chamber to block a reverse flow of combustion products applied thereto f
    Type: Grant
    Filed: April 24, 1989
    Date of Patent: June 4, 1991
    Assignee: Paloma Kogyo Kabushiki Kaisha
    Inventors: Katsusuke Ishiguro, Nobuyoshi Yokoyama
  • Patent number: 4960078
    Abstract: A pulse combustion device adapted for use in a liquid heating apparatus. The combustion device includes a combustion chamber having a forward end wall formed with an inlet port to be supplied with a mixture of gaseous fuel and air, an attachment plate unitedly provided with the forward end wall of the combustion chamber for engagement with a liquid vessel of the heating apparatus, a cylindrical decoupler arranged coaxially with the combustion chamber at its rear side, a plurality of tailpipes connected at their one ends to the combustion chamber and at their other ends to a front end of the decoupler, the tailpipes being arranged at their intermediate portions in parallel along the outer circumference of the decoupler, and an exhaust pipe connected at its one end to a rear portion of the decoupler and being extended forwardly along the circumference of the decoupler, said exhaust pipe being further extended forwardly through the attachment plate.
    Type: Grant
    Filed: November 9, 1989
    Date of Patent: October 2, 1990
    Assignee: Paloma Kogyo Kabushiki Kaisha
    Inventors: Nobuyoshi Yokoyama, Susumu Ejiri
  • Patent number: 4957096
    Abstract: A gas cooking appliance for cooking chow mein, pan cakes or the like on a hot plate mounted thereon, which cooking appliance includes a pulse combustion burner installed within as internal compartment of the appliance and having a combustion chamber coupled with a bottom portion of the hot plate to take place pulse combustion of a mixture of gaseous fuel and air supplied thereinto, wherein the hot plate is in the form of a thick metallic plate formed therein with a tailpipe passage which is connected at one end thereof to an exhaust port of the combustion chamber and extends outwardly through the metallic plate to permit the flow of combustion products discharged therethrough from said combustion chamber.
    Type: Grant
    Filed: December 1, 1989
    Date of Patent: September 18, 1990
    Inventor: Nobuyoshi Yokoyama
  • Patent number: 4955805
    Abstract: A check-valve mechanism of a pulse combustion apparatus for passing air into a mixing chamber includes (i) a partition wall separating an air inlet chamber and the mixing chamber from each other, (ii) a plurality of rear discs of relatively small diameters spaced apart from the partition wall and located inside the mixing chamber, and (iii) a plurality of front discs, or valve members, located between said partition wall and said rear discs; respectively. The circular portions of the partition wall which overlies the respective valve members (as viewed from the side of the air inlet chamber) each have a plurality of radially-extended elongate openings for passing air into the mixing chamber. Each rear disc has a plurality of small circular openings. Each valve member is axially movable between the partition wall and the associated rear disc, thereby opening and closing the elongate openings.
    Type: Grant
    Filed: February 13, 1989
    Date of Patent: September 11, 1990
    Assignee: Paloma Kogyo Kabushiki Kaisha
    Inventors: Katsusuke Ishiguro, Tsuneyasu Hayakawa, Nobuyoshi Yokoyama
  • Patent number: 4947824
    Abstract: A pulse combustion fat fryer of the table type includes a box-type cabinet having a front compartment and an upright rear compartment, an open-top vessel assembled within the front compartment to store an amount of cooking oil, the vessel having a front wall and a bottom wall the front part of which is located adjacent a bottom plate of the cabinet and the rear part of which is spaced upward from the bottom plate, a pulse combustion burner having a combustion chamber secured at its inlet end to the front wall of the vessel and immersed in the liquid in the vessel, a tailpipe connected at one end thereof to an exhaust port of the combustion chamber and being extended outwardly from the vessel, an air intake muffler and an exhaust muffler vertically disposed in parallel within the upright rear compartment of the cabinet, an air chamber casing secured to the front wall of the vessel and being connected to the air intake muffler to be supplied with fresh air, an exhaust decoupler located just below the rear part
    Type: Grant
    Filed: September 8, 1989
    Date of Patent: August 14, 1990
    Assignee: Paloma Kogyo Kabushiki Kaisha
    Inventors: Susumu Ejiri, Makoto Kimura, Yasuhiko Tabuchi, Nobuyoshi Yokoyama
  • Patent number: 4934923
    Abstract: A gas distributor in the fuel gas supply system of a pulse combustion apparatus comprises a cylindrical wall having one end connected to the rest of the fuel gas supply system and another end defining an end wall facing a flame trap and spaced apart therefrom. The distributor is removably connected to the rest of the fuel gas supply system and its end wall has an adjustable distance from the flame trap. The distributor has a plurality of nozzle openings which may be provided through its cylindrical or end wall, or through both of its cylindrical and end walls.
    Type: Grant
    Filed: September 20, 1988
    Date of Patent: June 19, 1990
    Assignee: Paloma Kogyo Kabushiki Kaisha
    Inventors: Nobuyoshi Yokoyama, Tsuneyasu Hayakawa
  • Patent number: 4928664
    Abstract: A pulse combustion heating apparatus includes a open-top vessel assembled within a support frame to store an amount of liquid such as cooking oil to be heated, and a pulse combustion burner mounted to the vessel and having a combustion chamber secured at its inlet end to a side wall of the vessel and immersed in the liquid in the vessel and at least a pair of tailpipes each connected at their inner ends to an exhaust port of the combustion chamber in such a manner that the tailpipes are arranged symmetrically in the vessel and immersed in the liquid and being extended outwardly from the vessel. The vessel has a pair of parallel bottom walls inclined downwardly inwardly toward the center of the vessel, and a pair of cylindrical decouplers are housed in a pair of spaces just below the bottom walls of the vessel within the support frame and located in parallel along the bottom walls of the vessel.
    Type: Grant
    Filed: September 1, 1989
    Date of Patent: May 29, 1990
    Assignee: Paloma Kogyo Kabushiki Kaisha
    Inventors: Hiroshi Nishino, Susumu Ejiri, Nobuyoshi Yokoyama
  • Patent number: 4919110
    Abstract: A gas cooking appliance for cooking chow mein, pan cakes or the like on a hot plate mounted thereon, which cooking appliance includes a pulse combustion burner installed within an internal compartment of the appliance and having a combustion chamber coupled with a bottom portion of the hot plate to take place pulse combustion of a mixture of gaseous fuel and air supplied thereinto, wherein the hot plate is in the form of a thick metallic plate formed therein with a tailpipe passage which is connected at one end thereof to an exhaust port of the combustion chamber and extends outwardly through the metallic plate to permit the flow of combustion products discharged therethrough from said combustion chamber.
    Type: Grant
    Filed: July 25, 1988
    Date of Patent: April 24, 1990
    Assignee: Paloma Kogyo Kabushiki Kaisha
    Inventor: Nobuyoshi Yokoyama
  • Patent number: 4895510
    Abstract: A vessel assembly defining a combustion chamber in a pulsating combustor is composed of a pair of generally boat-shaped vessels each made by plastic deformation and having a longitudinal plane terminating in a transverse plane which is perpendicular to its longitudinal plane. Each vessel is open in both of its longitudinal and transverse planes and has an exhaust port. The vessels are joined to each other in their longitudinal planes to form an integral assembly which is totally closed except for the exhaust ports and the transverse planes in which they form an end opening for admitting a mixture of fuel and air into the assembly. The assembly is joined around its end opening to the edge of an opening made in a wall defining a vessel for holding the liquid to be heated.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: January 23, 1990
    Assignee: Paloma Kogyo Kabushiki Kaisha
    Inventor: Nobuyoshi Yokoyama
  • Patent number: 4863370
    Abstract: A combustion chamber for a pulse combustion apparatus has a generally circular cross section as viewed from a direction which is perpendicular, in a horizontal plane, to a direction of flow of an air/fuel mixture into the chamber. The chamber includes an inlet from which the air/fuel mixture flows into the chamber and outlet from which burned gas comes out of the chamber. The inlet is located on an upstream side. Also, the inlet is located within an upper half of the foregoing cross section of the chamber as viewed from the foregoing perpendicular direction. The outlet is located at the center of the foregoing cross section of the chamber as viewed from the foregoing perpendicular direction. The outlet has an axial centerline which cuts an axial centerline of the inlet at right angles, as viewed from above or below, if the axial centerline of the outlet is extended inwardly of the chamber while extending the axial centerline of the inlet in a downstream direction.
    Type: Grant
    Filed: January 31, 1989
    Date of Patent: September 5, 1989
    Assignee: Paloma Kogyo Kabushiki Kaisha
    Inventors: Nobuyoshi Yokoyama, Tsuneyasu Hayakawa
  • Patent number: 4808107
    Abstract: A pulse combustion system in which a single air intake assembly is associated with a plurality of pulse combustion gaseous fuel heater assemblies. The air intake assembly includes a blower arranged to supply combustion air to the heater assemblies, and the heater assemblies each includes a pulse combustion burner arranged to be supplied with gaseous fuel from a source of gaseous fuel and the combustion air from the blower. A tailpipe is connected to the combustion chamber of the burner and arranged therewith within a water tub or an oil vessel. An electric control appartus for the system selectively activates the heater assemblies, energizes a motor of the blower for a predetermined period of time prior to selective activation of the heater assemblies and energizes the motor of the blower for a second predetermined period of time after one of the heater assemblies has been deactivated during activation of the other heater assemblies.
    Type: Grant
    Filed: May 5, 1987
    Date of Patent: February 28, 1989
    Assignee: Paloma Kogyo Kabushik Kaisha
    Inventors: Nobuyoshi Yokoyama, Yoshihiro Matsumura
  • Patent number: 4715807
    Abstract: In a pulse combustion device including a housing forming therein a combustion chamber, a cylindrical support member joined to the housing to form a mixing chamber in open communication with the combustion chamber, an annular perforated flange member coupled with an open end of the support member, a cylindrical member mounted in the center of the flange member to form a gas passage in open communication with the mixing chamber, a flapper-type air inlet valve assembly mounted on the flange member, and a flapper-type gas inlet valve assembly disposed within the cylindrical member. The air inlet valve assembly includes an annular valve plate formed with a plurality of circumferentially equi-spaced circular air ports and being secured to annular end surfaces of the flange member and the cylindrical member, and a plurality of circumferentially equi-spaced air inlet valve units mounted on the valve plate on a common circular path concentric with the gas passage.
    Type: Grant
    Filed: January 27, 1987
    Date of Patent: December 29, 1987
    Assignee: Paloma Kogyo Kabushiki Kaisha
    Inventors: Nobuyoshi Yokoyama, Tsuneyasu Hayakawa