Patents by Inventor Yuji KAJI
Yuji KAJI 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).
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Publication number: 20240173021Abstract: An endoscopic treatment method includes: inserting an endoscope into a digestive tract; forming a damaged area in at least a portion of the digestive tract along a circumferential direction by performing cauterizing while keeping a mucosal layer by observing with the endoscope; and forming an incomplete stenosis in the digestive tract, while restoring the damaged area, wherein the damaged area is formed by causing damage to a mucosal base layer, the mucosal base layer having an interface that contacts a submucosal layer.Type: ApplicationFiled: February 7, 2024Publication date: May 30, 2024Applicant: OLYMPUS CORPORATIONInventors: Haruhiro INOUE, Kunihide KAJI, Yuji KISHIMOTO, Nobuko MATSUO, Yoshie AIKAWA
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Patent number: 11944281Abstract: An endoscopic treatment method includes: inserting an endoscope into a digestive tract; forming a damaged area in at least a portion of the digestive tract along a circumferential direction by performing cauterizing while keeping a mucosal layer by observing with the endoscope; and forming an incomplete stenosis in the digestive tract, while restoring the damaged area, wherein the damaged area is formed by causing damage to a mucosal base layer, the mucosal base layer having an interface that contacts a submucosal layer.Type: GrantFiled: October 15, 2020Date of Patent: April 2, 2024Assignee: OLYMPUS CORPORATIONInventors: Haruhiro Inoue, Kunihide Kaji, Yuji Kishimoto, Nobuko Matsuo, Yoshie Aikawa
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Publication number: 20230383381Abstract: Provided is a heat-resistant Ir alloy, which is further improved in Vickers hardness while maintaining satisfactory processability. Specifically, provided is a heat-resistant Ir alloy, including: 5 mass % to 30 mass % of Pt; 0.5 mass % to 5 mass % of Ta; and 0.003 mass % to 0.15 mass % of at least one kind selected from the group consisting of: Sc; Hf; and W, with the balance being Ir.Type: ApplicationFiled: May 5, 2023Publication date: November 30, 2023Applicants: ISHIFUKU METAL INDUSTRY CO., LTD., DENSO CORPORATIONInventors: Kenta TERAI, Shunsuke TAKEYA, Hayato YASUHARA, Akihiro SHIBATA, Ryohei AKIYOSHI, Yuji KAJI
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Patent number: 11757261Abstract: A ground electrode for a spark plug includes a ground electrode body arranged to face a center electrode of the spark plug. The ground electrode includes a discharge portion mounted on the ground electrode body to face the center electrode with a spark gap between the discharge portion and the center electrode. The discharge portion is made of a platinum-based alloy of platinum, rhodium, and nickel. A first mass percent of the rhodium contained in the platinum-based alloy of the platinum, the rhodium, and the nickel is within a first range from 2 wt % to 20 wt % inclusive. A second mass percent of the nickel contained in the platinum-based alloy of the platinum, the rhodium, and the nickel being within a second range from 2.5 wt % to 12 wt % inclusive.Type: GrantFiled: November 3, 2022Date of Patent: September 12, 2023Assignee: DENSO CORPORATIONInventors: Yuji Kaji, Nobuo Abe, Naoto Hayashi
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Patent number: 11754032Abstract: An ignition system has an ignition plug and an ignition control unit that controls the ignition plug. When an engine is in a predetermined operating state, the ignition control unit performs ignition control after top dead center to perform ignition after the compression top dead center. The ignition system has an airflow support structure that facilitates the flow of airflow through a discharge gap at least after the compression top dead center. The ignition system is configured such that due to the airflow support structure and the timing of the ignition, airflow at a flow rate of 5 m/s or more flows through the discharge gap during a spark period after top dead center, which is the generation period of the discharge spark in the ignition control after top dead center.Type: GrantFiled: July 27, 2022Date of Patent: September 12, 2023Assignee: DENSO CORPORATIONInventors: Yasuomi Imanaka, Ryo Tamura, Yuji Kaji, Atsushi Iwami, Tatsuya Oka, Yuuta Kawashima
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Publication number: 20230184160Abstract: An ignition system includes a dividing wall which divides a combustion chamber of an engine into a main chamber and a pre-chamber and has formed therein at least one spray hole which communicates between the main chamber and the pre-chamber, and a spark plug in which voltage is applied across a spark gap between a first electrode and a second electrode to create an electrical spark to ignite fuel. The pre-chamber has the first electrode. The dividing wall or a member which electrically conducts with the dividing wall has the second electrode. The ignition system executes an after-top-dead-center ignition control mode to ignite fuel after a compression stroke top dead center. In the after-top-dead-center ignition control mode, an ignition source which is in the form of a self-growable flame kernel is provided in a spray hole-nearby region, the spray hole, or the main chamber within a crank angle of 20° after an ignition timing at which the voltage starts to be applied across the spark gap.Type: ApplicationFiled: February 3, 2023Publication date: June 15, 2023Inventors: Yuji KAJI, Ryo TAMURA, Yasuomi IMANAKA, Yuuta KAWASHIMA, Atsushi IWAMI, Tatsuya OKA
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Publication number: 20230147920Abstract: A ground electrode for a spark plug includes a ground electrode body arranged to face a center electrode of the spark plug. The ground electrode includes a discharge portion mounted on the ground electrode body to face the center electrode with a spark gap between the discharge portion and the center electrode. The discharge portion is made of a platinum-based alloy of platinum, rhodium, and nickel. A first mass percent of the rhodium contained in the platinum-based alloy of the platinum, the rhodium, and the nickel is within a first range from 2 wt % to 20 wt % inclusive. A second mass percent of the nickel contained in the platinum-based alloy of the platinum, the rhodium, and the nickel being within a second range from 2.5 wt % to 12 wt % inclusive.Type: ApplicationFiled: November 3, 2022Publication date: May 11, 2023Inventors: Yuji KAJI, Nobuo ABE, Naoto HAYASHI
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Publication number: 20220364538Abstract: An ignition system has an ignition plug and an ignition control unit that controls the ignition plug. When an engine is in a predetermined operating state, the ignition control unit performs ignition control after top dead center to perform ignition after the compression top dead center. The ignition system has an airflow support structure that facilitates the flow of airflow through a discharge gap at least after the compression top dead center. The ignition system is configured such that due to the airflow support structure and the timing of the ignition, airflow at a flow rate of 5 m/s or more flows through the discharge gap during a spark period after top dead center, which is the generation period of the discharge spark in the ignition control after top dead center.Type: ApplicationFiled: July 27, 2022Publication date: November 17, 2022Inventors: Yasuomi IMANAKA, Ryo TAMURA, Yuji KAJI, Atsushi IWAMI, Tatsuya OKA, Yuuta KAWASHIMA
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Patent number: 10637214Abstract: A spark plug is provided which includes a hollow cylindrical center electrode disposed inside a metal shell and a ground electrode joined to the metal shell. The ground electrode has an inner peripheral surface facing an outer peripheral surface of the center electrode. At least one of the outer periphery of the center electrode and the inner periphery of the ground electrode has formed therein at least one recess whose ends lies in a center-to-ground electrode facing region where the outer peripheral surface of the center electrode faces the inner peripheral surface of the ground electrode in a radial direction of the center electrode. This decreases voltage required by the spark plug to achieve discharge.Type: GrantFiled: January 28, 2019Date of Patent: April 28, 2020Assignee: DENSO CORPORATIONInventor: Yuji Kaji
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Patent number: 10559944Abstract: A spark plug for an internal combustion engine that can improve bonding strength between a center electrode and a conductive glass is provided. The spark plug includes a housing, an insulator, a center electrode, a ground electrode, and a conductive glass. The center electrode has a locking portion that is locked from a base end side to a step portion formed on an inner peripheral surface of the insulator, and an electrode head that is closer to the base end side than the locking portion is. A concave portion is partially formed on the tip end surface of the electrode head. A concave contour, which is an outer peripheral contour of the concave portion when viewed in a plug axial direction, forms a closed curve which is spaced apart from a head contour, which is an outer peripheral contour of the base end surface of the electrode head, and surrounds a center axis (B) of the center electrode.Type: GrantFiled: March 17, 2017Date of Patent: February 11, 2020Assignee: DENSO CORPORATIONInventors: Yuji Kaji, Koji Yamanaka
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Patent number: 10476238Abstract: A spark plug for internal combustion engines is provided which includes a porcelain insulator which is disposed inside a housing and extends outside a front end of the porcelain insulator. An annular ground electrode is secured to a front end portion of the housing. A pocket is created between a nose of the porcelain insulator and the housing. The housing has formed therein a plurality of vent holes which are located outside the ground electrode in a radial direction of the housing and communicate between the pocket and a combustion chamber of the engine. The vent holes include a first vent hole and a second vent hole which are different in opening area from each other, thereby enhancing scavenging of the pocket to ensure the stability of operation of the spark plug.Type: GrantFiled: December 10, 2018Date of Patent: November 12, 2019Assignee: DENSO CORPORATIONInventor: Yuji Kaji
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Publication number: 20190237943Abstract: A spark plug is provided which includes a hollow cylindrical center electrode disposed inside a metal shell and a ground electrode joined to the metal shell. The ground electrode has an inner peripheral surface facing an outer peripheral surface of the center electrode. At least one of the outer periphery of the center electrode and the inner periphery of the ground electrode has formed therein at least one recess whose ends lies in a center-to-ground electrode facing region where the outer peripheral surface of the center electrode faces the inner peripheral surface of the ground electrode in a radial direction of the center electrode. This decreases voltage required by the spark plug to achieve discharge.Type: ApplicationFiled: January 28, 2019Publication date: August 1, 2019Inventor: Yuji KAJI
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Publication number: 20190214791Abstract: A spark plug for an internal combustion engine that can improve bonding strength between a center electrode and a conductive glass is provided. The spark plug includes a housing, an insulator, a center electrode, a ground electrode, and a conductive glass. The center electrode has a locking portion that is locked from a base end side to a step portion formed on an inner peripheral surface of the insulator, and an electrode head that is closer to the base end side than the locking portion is. A concave portion is partially formed on the tip end surface of the electrode head. A concave contour, which is an outer peripheral contour of the concave portion when viewed in a plug axial direction, forms a closed curve which is spaced apart from a head contour, which is an outer peripheral contour of the base end surface of the electrode head, and surrounds a center axis (B) of the center electrode.Type: ApplicationFiled: March 17, 2017Publication date: July 11, 2019Applicant: DENSO CORPORATIONInventors: Yuji KAJI, Koji YAMANAKA
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Publication number: 20190181620Abstract: A spark plug for internal combustion engines is provided which includes a porcelain insulator which is disposed inside a housing and extends outside a front end of the porcelain insulator. An annular ground electrode is secured to a front end portion of the housing. A pocket is created between a nose of the porcelain insulator and the housing. The housing has formed therein a plurality of vent holes which are located outside the ground electrode in a radial direction of the housing and communicate between the pocket and a combustion chamber of the engine. The vent holes include a first vent hole and a second vent hole which are different in opening area from each other, thereby enhancing scavenging of the pocket to ensure the stability of operation of the spark plug.Type: ApplicationFiled: December 10, 2018Publication date: June 13, 2019Inventor: Yuji KAJI
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Publication number: 20180159304Abstract: A pipe material used as a discharge electrode of a spark plug for an internal combustion engine comprises an outer layer made of a Ni-based alloy, an inner layer made of a Pt-based alloy provided inside the outer layer, and an intermediate layer provided between the outer layer and the inner layer.Type: ApplicationFiled: December 1, 2017Publication date: June 7, 2018Inventors: Masayuki TAMURA, Yuji KAJI, Yoshinori DOI, Shinya TANAKA, Atsushi YOSHIDA