Patents by Inventor Kenji Nasu
Kenji Nasu 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).
-
Patent number: 11967750Abstract: A low-cost, small-size Wilkinson-type combiner that suppresses the risk of damaging an isolation resistor due to combination loss is provided. The combiner comprises first and second input terminals to which RF signals are input; an output terminal; a wiring line that combines the RF signals input to the first and second input terminals, and outputs the combined signal to the output terminal; an isolation unit provided between the first and second input terminals and formed by a first isolation resistor, a transformer, and a second isolation resistor connected in series; a detection circuit connected to a secondary coil of the transformer and configured to detect a current flowing in the secondary coil; and a determination circuit that outputs a control signal to block input of RF signals to the first and second input terminals if the current flowing in the isolation unit and detected by the detection circuit is higher than or equal to a prescribed value.Type: GrantFiled: February 6, 2020Date of Patent: April 23, 2024Assignee: HITACHI KOKUSAI ELECTRIC INC.Inventors: Sunao Egashira, Kenji Nasu, Yuichiro Suenaga, Naoya Fujimoto
-
Publication number: 20220045417Abstract: A low-cost, small-size Wilkinson-type combiner that suppresses the risk of damaging an isolation resistor due to combination loss is provided. The combiner comprises first and second input terminals to which RF signals are input; an output terminal; a wiring line that combines the RF signals input to the first and second input terminals, and outputs the combined signal to the output terminal; an isolation unit provided between the first and second input terminals and formed by a first isolation resistor, a transformer, and a second isolation resistor connected in series; a detection circuit connected to a secondary coil of the transformer and configured to detect a current flowing in the secondary coil; and a determination circuit that outputs a control signal to block input of RF signals to the first and second input terminals if the current flowing in the isolation unit and detected by the detection circuit is higher than or equal to a prescribed value.Type: ApplicationFiled: February 6, 2020Publication date: February 10, 2022Applicant: HITACHI KOKUSAI ELECTRIC INC.Inventors: Sunao EGASHIRA, Kenji NASU, Yuichiro SUENAGA, Naoya FUJIMOTO
-
Patent number: 10491202Abstract: An RF generator includes: a modulation circuit outputting a pulsed RF signal; a variable attenuation circuit adjusting the level of the pulsed RF signal; an output power detecting unit detecting an output power value of the power output from the device; a first comparative arithmetic circuit outputting a first level control signal for controlling the level of the adjusted pulsed RF signal on the basis of a first detected voltage value and a set voltage value set in advance; a second comparative arithmetic circuit outputting a second level control signal for controlling the level of the adjusted pulsed RF signal on the basis of a second detected voltage value and the set voltage value; and a switching circuit switching between the value of the first level control signal and the value of the second level control signal depending on a switching timing setting value.Type: GrantFiled: September 1, 2017Date of Patent: November 26, 2019Assignee: HITACHI KOKUSAI ELECTRIC INC.Inventors: Yoshiyuki Oshida, Kenji Nasu, Naoya Fujimoto
-
Publication number: 20190267978Abstract: An RF generator includes: a modulation circuit outputting a pulsed RF signal; a variable attenuation circuit adjusting the level of the pulsed RF signal; an output power detecting unit detecting an output power value of the power output from the device; a first comparative arithmetic circuit outputting a first level control signal for controlling the level of the adjusted pulsed RF signal on the basis of a first detected voltage value and a set voltage value set in advance; a second comparative arithmetic circuit outputting a second level control signal for controlling the level of the adjusted pulsed RF signal on the basis of a second detected voltage value and the set voltage value; and a switching circuit switching between the value of the first level control signal and the value of the second level control signal depending on a switching timing setting value.Type: ApplicationFiled: September 1, 2017Publication date: August 29, 2019Applicant: HITACHI KOKUSAI ELECTRIC INC.Inventors: YOSHIYUKI OSHIDA, KENJI NASU, NAOYA FUJIMOTO
-
Patent number: 9469714Abstract: The invention provides a cationic emulsion having a polymer core-shell structure that exhibits excellent substrate adhesiveness, water resistance, alcohol resistance, and high gloss when used in an aqueous ink, and exhibits excellent color developing properties and water resistance when used in a recording medium, specifically, a cationic emulsion having a polymer core-shell structure comprising component (A) and component (B) and having a mass ratio of component (A):component (B) of 25:75-75:25. (A) Emulsion polymer core component obtained by polymerizing a monomer having a vinyl chloride monomer as a constituent. (B) Emulsion polymer shell component, having a structure obtained by polymerizing a monomer mixture having, as constituents: styrenes and a compound of formula (1); or styrenes, a compound of formula (1), and a (meth)acrylic ester having 1-22 carbon atoms in the ester part as a compound (2); in which the compound of formula (1) is 20-45 mass % in the monomer mixture.Type: GrantFiled: February 4, 2014Date of Patent: October 18, 2016Assignees: SEIKO PMC CORPORATION, NISSIN CHEMICAL INDUSTRY CO., LTD.Inventors: Shiro Umeuchi, Kenji Nasu, Yasuhiro Mitta
-
Publication number: 20150353670Abstract: The invention provides a cationic emulsion having a polymer core-shell structure that exhibits excellent substrate adhesiveness, water resistance, alcohol resistance, and high gloss when used in an aqueous ink, and exhibits excellent color developing properties and water resistance when used in a recording medium, specifically, a cationic emulsion having a polymer core-shell structure comprising component (A) and component (B) and having a mass ratio of component (A):component (B) of 25:75-75:25. (A) Emulsion polymer core component obtained by polymerizing a monomer having a vinyl chloride monomer as a constituent. (B) Emulsion polymer shell component, having a structure obtained by polymerizing a monomer mixture having, as constituents: styrenes and a compound of formula (1); or styrenes, a compound of formula (1), and a (meth)acrylic ester having 1-22 carbon atoms in the ester part as a compound (2); in which the compound of formula (1) is 20-45 mass % in the monomer mixture.Type: ApplicationFiled: February 4, 2014Publication date: December 10, 2015Applicants: NISSIN CHEMICAL INDUSTRY CO., LTD., SEIKO PMC CORPORATIONInventors: Shiro UMEUCHI, Kenji NASU, Yasuhiro MITTA
-
Patent number: 9181443Abstract: A resin for aqueous pigment dispersion that allows the production of an aqueous pigment dispersion for ink jet recording that contains only a few coarse particles and has excellent ejection stability, an aqueous pigment dispersion containing the resin for aqueous pigment dispersion, an ink jet recording ink, and a method for producing an aqueous pigment dispersion. A resin for aqueous pigment dispersion produced by copolymerization of a composition that contains (a) one or two or more compounds selected from the group consisting of alkenylsuccinic acids, alkenylsuccinic anhydrides, alkylsuccinic acids, and alkylsuccinic anhydrides, and (b) a styrene monomer, wherein the (a) component constitutes 5% by mass or more and the (b) component constitutes 30% by mass or more of the total amount of all the monomer component(s) and the (a) component of the composition.Type: GrantFiled: April 6, 2012Date of Patent: November 10, 2015Assignee: DIC CORPORATIONInventors: Hiroyuki Buei, Yoshinosuke Shimamura, Shinichi Okada, Kenji Nasu, Takashi Yoshinari
-
Publication number: 20120325111Abstract: A resin for aqueous pigment dispersion that allows the production of an aqueous pigment dispersion for ink jet recording that contains only a few coarse particles and has excellent ejection stability, an aqueous pigment dispersion containing the resin for aqueous pigment dispersion, an ink jet recording ink, and a method for producing an aqueous pigment dispersion. A resin for aqueous pigment dispersion produced by copolymerization of a composition that contains (a) one or two or more compounds selected from the group consisting of alkenylsuccinic acids, alkenylsuccinic anhydrides, alkylsuccinic acids, and alkylsuccinic anhydrides, and (b) a styrene monomer, wherein the (a) component constitutes 5% by mass or more and the (b) component constitutes 30% by mass or more of the total amount of all the monomer component(s) and the (a) component of the composition.Type: ApplicationFiled: April 6, 2012Publication date: December 27, 2012Applicant: DIC CORPORATIONInventors: Hiroyuki Buei, Yoshinosuke Shimamura, Shinichi Okada, Kenji Nasu, Takashi Yoshinari
-
Publication number: 20120329931Abstract: A method for producing an aqueous pigment dispersion for ink jet recording that contains only a few coarse particles and has excellent ejection stability, and an aqueous ink for ink jet recording. A method for producing an aqueous pigment dispersion for ink jet recording according to the present invention includes a kneading process for kneading a mixture of a pigment, a resin having an anionic group, and an alkali metal hydroxide to produce a pigment dispersion having a solid content of 50% by mass or more, and a mixing process for mixing and agitating the pigment dispersion in an aqueous medium.Type: ApplicationFiled: April 6, 2012Publication date: December 27, 2012Applicant: DIC CORPORATIONInventors: Hiroyuki Buei, Yoshinosuke Shimamura, Shinichi Okada, Kenji Nasu, Takashi Yoshinari
-
Publication number: 20120183769Abstract: An adhesive composition of the present invention is characterized by including: an acrylic copolymer (A) containing 30 to 77% by weight of a structural unit (a1) derived from an alkyl acrylate monomer in which an alkyl group has 5 to 20 carbon atoms; 20 to 60% by weight of a structural unit (a2) derived from an alicyclic group-containing (meth)acrylate monomer; 0.01 to 5% by weight of a structural unit (a3) derived from a tertiary amino group-containing monomer that is derived from (meth)acrylic acid; and 0.Type: ApplicationFiled: September 29, 2010Publication date: July 19, 2012Applicant: LINTEC CorporationInventors: Kenji Nasu, Yuki Hongo
-
Publication number: 20110305983Abstract: The objectives of the present invention are attained with a release agent for toner that is obtained by grafting styrene compounds to an ?-olefin polymer that conforms to the following conditions (a) and (b), wherein 70 mass % or more of the release agent is insoluble in 2-butanone when the release agent is dispersed at 25° C. into 2-butanone so that the mass ratio of the release agent to the dispersion is 15%. (a) The ?-olefin polymer is to be produced by polymerization of at least one ?-olefin monomer that has 16 or more to 36 or less carbon atoms. (b) The ?-olefin polymer is to have a melting point between 30° C. or higher and 80° C. or lower, and has one peak temperature whose peak has the half-height width of 15° C. or less in a measurement of the melting behavior of the ?-olefin polymer by means of differential scanning calorimetry.Type: ApplicationFiled: February 8, 2010Publication date: December 15, 2011Applicants: IDEMITSU KOSAN CO., LTD., SEIKO PMC CORPORATIONInventors: Seiji Kounou, Koji Morimoto, Kenji Nasu, Takenori Fujimura
-
Patent number: 5756646Abstract: An agent for improving surface quality of paper comrising an acrylamide resin composition obtained by hydrolyzing an acrylamide resin which is obtained by polymerizing an acrylamide monomer in the presence of a urea compound, or copolymerizing an acrylamide monomer and an acrylonitrile monomer; an acrylamide monomer and a cross-linking agent; or an acrylamide monomer, an acrylnitrile monomer and a cross-linking agent in the presence of a urea compound. This agent provides paper with excellent surface strength, tensile strength and internal strength far better than conventional paper quality improving agents.Type: GrantFiled: March 15, 1996Date of Patent: May 26, 1998Assignee: Japan PMC CorporationInventors: Kenji Nasu, Hiroharu Kawano, Satoshi Takizawa, Kiyoshi Iwai
-
Patent number: 4957387Abstract: A spline joint includes an externally splined shaft end and an internally splined hub end engaged therewith. The shaft end has an annular groove around the spline portion wherein a plurality of locking balls may ride. The hub has the same number of holes as there are locking balls, each of which hole is adapted to receive a locking ball. A sliding sheath surrounds the hub. This sliding sheath has an annular projection and an annular groove in axially spaced relation around its internal face. The annular projection presses against the locking balls when the spline joint is in operation. The annular groove embraces a polygonal spring, the spring having the same number of sides as the number of locking balls. The center of each side of the polygonal spring presses against a lock ball from a radially outward position and prevents the lock balls from going out of position when the spline joint is being detached.Type: GrantFiled: July 29, 1988Date of Patent: September 18, 1990Assignee: K.S. Sanoyas Co. Ltd.Inventor: Kenji Nasu