Patents by Inventor Katsumi Sakai
Katsumi Sakai 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: 20240113218Abstract: A first trench extending in a Y direction is formed in each of a semiconductor substrate located in a cell region and the semiconductor substrate located in an outer peripheral region. A second trench is formed in the semiconductor substrate in the outer peripheral region so as to surround the cell region in a plan view. A p-type body region is formed in the semiconductor substrate in each region. A plurality of p-type floating regions is formed in the semiconductor substrate in the outer peripheral region. A field plate electrode is formed at a lower portion of each of the first trench and the second trench. A gate electrode is formed at an upper portion of the first trench located in the cell region. A floating gate electrode is formed at an upper portion of each of the first trench located in the outer peripheral region and the second trench.Type: ApplicationFiled: July 17, 2023Publication date: April 4, 2024Inventors: Tomoya NISHIMURA, Atsushi SAKAI, Katsumi EIKYU
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Patent number: 8154150Abstract: A power line communication system which enables high quality communication utilizing a pair of power lines connected to a vehicle mounted battery, has a pair of communication lines connected to a pair of power lines, respectively, to communicate a high frequency signal of 1 MHz or more. This system has a balance filter which is interposed between each of the communication lines and a vehicle mounted communication apparatus, the filter, a circuit configuration of which is formed in balance type. The communication system also has a pair of electrically balanced lines which are connected between the balance filter and each of the communication apparatuses and are power-fed from the battery, for performing communication between the communication apparatuses.Type: GrantFiled: March 24, 2008Date of Patent: April 10, 2012Assignees: SMK Corporation, Toyota Jidosha Kabushiki KaishaInventors: Katsumi Sakai, Koki Goto, Hajime Takata, Kunihiro Ohta
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Publication number: 20100111201Abstract: A power line communication system which enables high quality communication, utilizing a pair of power lines 12, 13 connected to a vehicle mounted battery 10, has a pair of communication lines 18 connected to a pair of power lines 12, 13, respectively, to communicate a high frequency signal of 1 MHz or more. This system has a balance filter 26 which is interposed between each of the communication lines 18 and a vehicle mounted communication apparatus 22, the filter 26, a circuit configuration of which is formed in balance type. The communication system also has a pair of electrically balanced lines 28 which are connected between the balance liter 26 and each of the communication apparatuses 22 and are power-fed from the battery 10, for performing communication between the communication apparatuses 22.Type: ApplicationFiled: March 24, 2008Publication date: May 6, 2010Applicants: SMK Corporation, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Katsumi Sakai, Koki Goto, Hajime Takata, Kunihiro Ohata
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Patent number: 7139527Abstract: A communication system having an excellent communication path capacity characteristic even in an insight transmission environment in which a transmitter and a receiver can see each other directly in an MIMO communication system and a wireless communication device for the communication system, including: a wireless device having a transmitter for distributing transmission data including encoded data and a training signal to a plurality of antennas, and transmitting the data as radio signals from the plurality of antennas at a predetermined timing; a plurality of wireless devices having repeaters each for receiving the radio signal, storing the radio signal into a buffer so that the radio signal is delayed by predetermined time, and transmitting the radio signal delayed; and a wireless device having a receiver for receiving the radio signals from the plurality of second wireless devices by a plurality of antennas and demodulating the encoded data by using the training signal multiplexed on the received radio siType: GrantFiled: July 11, 2002Date of Patent: November 21, 2006Assignees: Hitachi, Ltd., Hitachi Cable, Ltd.Inventors: Tsuyoshi Tamaki, Katsumi Sakai, Takashi Yano
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Publication number: 20030124976Abstract: A communication system having an excellent communication path capacity characteristic even in an insight transmission environment in which a transmitter and a receiver can see each other directly in an MIMO communication system and a wireless communication device for the communication system, including: a wireless device having a transmitter for distributing transmission data including encoded data and a training signal to a plurality of antennas, and transmitting the data as radio signals from the plurality of antennas at a predetermined timing; a plurality of wireless devices having repeaters each for receiving the radio signal, storing the radio signal into a buffer so that the radio signal is delayed by predetermined time, and transmitting the radio signal delayed; and a wireless device having a receiver for receiving the radio signals from the plurality of second wireless devices by a plurality of antennas and demodulating the encoded data by using the training signal multiplexed on the received radio siType: ApplicationFiled: July 11, 2002Publication date: July 3, 2003Inventors: Tsuyoshi Tamaki, Katsumi Sakai, Takashi Yano
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Patent number: 6404359Abstract: In a decoding system having a cache memory, for decoding a variable length code such as a MH code, the decoding is carried out by accessing the cache memory by using a variable length code as an address. Whether the cache memory is hit or mishit is judged by discriminating whether or not the code bits of the 7 bits succeeding to the firstly appeared “1” in the actual code is coincident with the tag stored in the cache memory. This comparison is carried out by masking bits other than an effective bit length of the actual code, by utilizing the three-bit information indicating the number of remaining bits in the actual code, succeeding to the firstly appeared “1”, outputted from the cache memory. Thus, the decoding system is capable of elevating the hit rate of the cache memory.Type: GrantFiled: May 30, 2000Date of Patent: June 11, 2002Assignee: NEC CorporationInventor: Katsumi Sakai
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Patent number: 5801840Abstract: In a modified Huffman (MH) code decoding apparatus, an MH code is composed of a first part and second part. The apparatus includes a code conversion table for outputting a run data in response to an index data and a code length table. The index data is composed of a color data indicative of a color of a run corresponding to the current MH code, a first code length data associated with a length of the first part of the current MH code, and a second part data indicative of the second part of the current MH code. The run data is composed of the color data, a code type data indicative of whether the current MH code is a terminate code or a make-up code, and a run length data indicative of a length of the run.Type: GrantFiled: May 23, 1996Date of Patent: September 1, 1998Assignee: NEC Corp.Inventor: Katsumi Sakai
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Patent number: 5644273Abstract: Disclosed is a piezoelectric resonator device. This piezoelectric resonator device comprises a piezoelectric substrate having an almost rectangular plane shape. The piezoelectric substrate is provided with a slit extending to the inside from one edge of the piezoelectric substrate, for forming a tuning fork portion, and a pair of slits for separating the tuning fork portion, spaced apart from the slit forming the tuning fork portion by a predetermined distance on both sides of the slit forming the tuning fork portion, and approximately parallel with the slit forming the tuning fork portion. Vibrating electrodes are formed on both major surfaces of the piezoelectric substrate at a piezoelectric vibrating portion, between the slits separating the tuning fork portion from non-vibrating portions of the substrate.Type: GrantFiled: June 7, 1995Date of Patent: July 1, 1997Assignee: Murata Manufacturing Co., Ltd.Inventors: Hiroaki Kaida, Jiro Inoue, Masatoshi Kajiwara, Hiroshi Nakatani, Katsumi Fujimoto, Katsumi Sakai
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Patent number: 5373267Abstract: Disclosed is a piezoelectric resonator device. This piezoelectric resonator device comprises a piezoelectric substrate having an almost rectangular plane shape. The piezoelectric substrate is provided with a slit extending to the inside from one edge of the piezoelectric substrate, for forming a tuning fork portion, and a pair of slits for separating the tuning fork portion, spaced apart from the slit forming the tuning fork portion by a predetermined distance on both sides of the slit forming the tuning fork portion, and approximately parallel with the slit forming the tuning fork portion. Vibrating electrodes are formed on both major surfaces of the piezoelectric substrate at a piezoelectric vibrating portion, between the slits separating the tuning fork portion from non-vibrating portions of the substrate.Type: GrantFiled: July 23, 1992Date of Patent: December 13, 1994Assignee: Murata Manufacturing Co., Ltd.Inventors: Hiroaki Kaida, Jiro Inoue, Masatoshi Kajiwara, Hiroshi Nakatani, Katsumi Fujimoto, Katsumi Sakai
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Patent number: 5373269Abstract: Disclosed is a piezoelectric resonator device. This piezoelectric resonator device comprises a piezoelectric substrate having an almost rectangular plane shape. The piezoelectric substrate is provided with a slit extending to the inside from one edge of the piezoelectric substrate, for forming a tuning fork portion, and a pair of slits for separating the tuning fork portion, spaced apart from the slit forming the tuning fork portion by a predetermined distance on both sides of the slit forming the tuning fork portion, and approximately parallel with the slit forming the tuning fork portion. Vibrating electrodes are formed on both major surfaces of the piezoelectric substrate at a piezoelectric vibrating portion between the slits separating the tuning fork portion from non-vibrating portions of the substrate.Type: GrantFiled: May 12, 1993Date of Patent: December 13, 1994Assignee: Murata Manufacturing Co., Ltd.Inventors: Hiroaki Kaida, Jiro Inoue, Masatoshi Kajiwara, Hiroshi Nakatani, Katsumi Fujimoto, Katsumi Sakai
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Patent number: 5159301Abstract: Disclosed is a piezoelectric resonator device. This piezoelectric resonator device comprises a piezoelectric substrate having an almost rectangular plane shape. The piezoelectric substrate is provided with a slit extending to the inside from one edge of the piezoelectric substrate, for forming a tuning fork portion, a pair of slits for separating the tuning fork portion, spaced apart from the slit forming a tuning fork portion by a predetermined distance on both sides of the slit forming the tuning fork portion, and approximately parallel with the slit forming a tuning fork portion. Vibrating electrodes are formed on both major surfaces of the piezoelectric substrate at a piezoelectric vibrating portion, between the slits separating the tuning fork portion from non-vibrating portions of the substrate.Type: GrantFiled: November 3, 1989Date of Patent: October 27, 1992Assignee: Murata Manufacturing Co., Ltd.Inventors: Hiroaki Kaida, Jiro Inoue, Masatoshi Kajiwara, Hiroshi Nakatani, Katsumi Fujimoto, Katsumi Sakai
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Patent number: 4892939Abstract: New 5-fluorouridine compounds of the general formula: ##STR1## wherein n is an integer of 1 to 3, R' stands for a straight or branched chain alkyl group having 1 to 4 carbon atoms or a benzyl group, and R stands for an amino acid residue selected from the group consisting of alanyl, phenylalanyl, valyl, tyrosyl, 3,4-dihydroxyphenylalanyl and lysyl groups. These compounds possess excellent anti-malignant tumor, anti-viral and immunosuppressive activities.Type: GrantFiled: January 29, 1988Date of Patent: January 9, 1990Assignee: Fuji Kagaku Kogyo Kabushiki KaishaInventors: Katsumi Sakai, Kiyoaki Chou, Takeshi Endo
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Patent number: 4565942Abstract: A liquid sensor mounted on the side wall of a liquid tank for detecting the existence of liquid in the tank. The sensor includes an element which generates a vibration in the direction of its thickness, of energy-trapped type for detecting the existence of liquid. The element consists of electrodes provided on both sides of a piezo-electric substrate, one side of the element for contacting the liquid in the tank being covered with a liquid-proof coating. The existence of liquid is detected from the change in resonance impedance or antiresonance impedance resulting from the liquid contact.Type: GrantFiled: June 29, 1984Date of Patent: January 21, 1986Assignee: Murata Manufacturing Co., Ltd.Inventors: Katsumi Sakai, Isao Toyoshima
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Patent number: 4340728Abstract: New nucleoside derivatives possessing strong anti-tumor activity with low toxicity, represented by the general formula: ##STR1## wherein (A-CO-- is a residue of a saturated straight or branched chain fatty acid, B is a nitrogen-containing group, Q is a substituent of the fatty acid, Z and Z' each is H or OH with the proviso that both of Z and Z' are not OH, and n is zero or an integer of at least 1, as well as physiologically acceptable salts thereof. These nucleoside derivatives are prepared by introducing the nitrogen-containing acyl group directly in one step or indirectly in two steps into the 5'-position of 5-fluorouridine, 2'-deoxy-5-fluorouridine or 1-.beta.-D-arabinofuranosyl-5-fluorouracil and splitting off any protective group and optionally converting the free compound into a physiologically acceptable salt thereof or vice versa.Type: GrantFiled: November 26, 1980Date of Patent: July 20, 1982Assignee: Fuji Kagaku Kogyo Kabushiki KaishaInventors: Takeshi Endo, Katsumi Sakai, Kiyoaki Chou, Yoshitaka Inamoto, Haruhiko Teshigawara
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Patent number: 4068070Abstract: .alpha.-Cyanoamine compounds represented by the following formula or an acid addition salt thereof ##STR1## WHEREIN R.sub.1 is a halogen atom or lower alkoxy group, R.sub.2 and R.sub.3 are a hydrogen atom or lower alkoxy group, R.sub.4 is a hydrogen atom or lower alkyl group, R.sub. 5 is a hydrogen atom, --COOR.sub.6 (R.sub.6 is lower alkyl group), ##STR2## (R.sub.7 is lower alkoxy group, m is a numeral 0-3), --R.sub.8 --COOR.sub.9 (R.sub.8 is lower alkylene group, R.sub.9 is lower alkyl group), ##STR3## (R.sub.10 and R.sub.11 are a hydrogen atom or lower alkyl group, or R.sub.10 and R.sub.11 jointly form alkylene group), or ##STR4## (R.sub.1 to R.sub.4 are the same as defined above) and n is a numeral 2 or 3; but it is excluded when R.sub.5 is hydrogen atom or --COOR.sub.6 (R.sub.Type: GrantFiled: January 12, 1976Date of Patent: January 10, 1978Assignees: Fuji Chemical Industry Co., Ltd., Nippon Chemiphar Co., Ltd.Inventors: Katsumi Sakai, Yukio Onogawa, Yoshitaka Inamoto, Hiroshi Nakajima, Yasuo Fujimoto, Kuniichiro Ohno, Masashi Yoshida, Shigehito Araki
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Patent number: 3962247Abstract: .alpha.-Cyanoamine compounds represented by the following formula or an acid addition salt thereof ##SPC1##Wherein R.sub.1 is a halogen atom or lower alkoxy group, R.sub.2 and R.sub.3 are a hydrogen atom or lower alkoxy group, R.sub.4 is a hydrogen atom or lower alkyl group, R.sub.5 is a hydrogen atom, -COOR.sub.6 (R.sub.6 is lower alkyl group), ##SPC2##(R.sub.7 is lower alkoxy group, m is a numeral 0-3), --R.sub.8 --COOR.sub.9 (R.sub.8 is lower alkylene group, R.sub.9 is lower alkyl group), ##EQU1## (R.sub.10 and R.sub.11 are a hydrogen atom or lower alkyl group, or R.sub.10 and R.sub.11 jointly form alkylene group), or ##SPC3##(R.sub.1 to R.sub.4 are the same as defined above) and n is a numeral 2 or 3; but it is excluded when R.sub.5 is hydrogen atom or --COOR.sub.6 (R.sub.Type: GrantFiled: August 6, 1974Date of Patent: June 8, 1976Assignees: Fuji Chemical Industry Co., Ltd., Nippon Chemiphar Co., Ltd.Inventors: Katsumi Sakai, Yukio Onogawa, Yoshitaka Inamoto, Hiroshi Nakajima, Yasuo Fujimoto, Kuniichiro Ohno, Masashi Yoshida, Shigehito Araki
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Patent number: 3948899Abstract: .alpha.-Cyanobenzylpiperazines represented by the formula ##SPC1##Or an acid addition salt thereof, wherein R.sub.1 is a halogen or 1-3C lower alkoxy, R.sub.2 and R.sub.3 are each hydrogen or 1-3C lower alkoxy, R.sub.4 is 1-3C lower alkyl, and R.sub.5 is hydrogen or 1-3C lower alkyl, which are produced by reacting an aromatic carbonyl compound with hydrogen cyanide or a salt thereof and N-alkoxycarbonyl piperazine or an acid addition salt thereof.Type: GrantFiled: August 7, 1974Date of Patent: April 6, 1976Assignees: Fuji Chemical Industry Co., Ltd., Nippon Chemiphar Co., Ltd.Inventors: Katsumi Sakai, Riitiro Iwaki, Katsuki Taoka, Hiroshi Nakajima, Yasuo Yamada