Patents by Inventor Nobumasa Ohtake
Nobumasa Ohtake 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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Patent number: 7994769Abstract: Multiple switching transistors are provided in parallel. An output circuit includes an inductor, an output capacitor, and a rectifying device. A pulse modulator generates a pulse signal with the duty ratio adjusted such that the output voltage of a switching regulator approaches a predetermined target value. A driver distributes a pulse signal to the multiple switching transistors, and switches the multiple switching transistors to the ON state in a time divisional manner.Type: GrantFiled: November 26, 2008Date of Patent: August 9, 2011Assignee: Rohm Co., Ltd.Inventors: Nobumasa Ohtake, Nobuaki Umeki
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Publication number: 20100109625Abstract: Multiple switching transistors are provided in parallel. An output circuit includes an inductor, an output capacitor, and a rectifying device. A pulse modulator generates a pulse signal with the duty ratio adjusted such that the output voltage of a switching regulator approaches a predetermined target value. A driver distributes a pulse signal to the multiple switching transistors, and switches the multiple switching transistors to the ON state in a time divisional manner.Type: ApplicationFiled: November 26, 2008Publication date: May 6, 2010Applicant: ROHM CO., LTD.Inventors: Nobumasa OHTAKE, Nobuaki UMEKI
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Patent number: 5140087Abstract: The present invention relates to an organosiloxane compound suitable for the modification of silicone rubbers and synthetic resins, an organosiloxane compound useful as its intermediate, and a process for preparing them. The organosiloxane compound of the present invention can be represented by the general formula (IV) ##STR1## wherein j is an integer of 1 to 2000, R is an alkyl group having 1 to 4 carbon atoms, and R.sup.1 is a pentafluorophenyl group or a straight-chain or a branched fluoroalkyl group represented by the formula (II)C.sub.a H.sub.b F.sub.2a-b+1 (II)wherein a is an integer of 3 to 18, and b is an integer of 0 to 2a.The siloxane compounds of the present invention also include compounds having siloxane chains, at least one of the chains having a substituent with a fluorine atom containing group at the terminal thereof.Type: GrantFiled: October 30, 1990Date of Patent: August 18, 1992Assignee: Chisso CorporationInventors: Takahiro Saho, Yoshinori Akutsu, Takaharu Nakano, Nobumasa Ohtake
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Patent number: 5098981Abstract: A novel polyorganosiloxane is provided which has a fluorine atom-containing substituent at one terminal of its molecular chain and an unsaturated double bond-containing substituent at the other terminal thereof. The polyorgansiloxane of the present invention is represented by the general formula (I) ##STR1## wherein j is an integer of 1 to 2000, and R.sup.1 is an unsaturated double bond-containing group, each of R.sup.2 and R.sup.3 is an alkyl group having 1 to 4 carbon atoms, phenyl group, vinyl group, straight-chain or branched alkenyl group having 3 to 20 carbon atoms, or a siloxane chain which is similar to ##STR2## and R.sup.4 is a fluorine atom-containing substituent, ##STR3## wherein R.sup.10 is similar to R.sup.4 and is the fruorine atom-containing substituent, R.sup.Type: GrantFiled: February 7, 1991Date of Patent: March 24, 1992Assignee: Chisso CorporationInventors: Takahiro Saho, Yoshinori Akutsu, Takaharu Nakano, Nobumasa Ohtake
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Patent number: 5096990Abstract: Resin compositions for the inner coat of semiconductors which include(A) 100 parts by weight of a polysiloxane having vinyl groups and having a viscosity of 100 to 800cP at 25.degree. C., said polysiloxane having a general formula ##STR1## in which V represents a vinyl group, Me represents a methyl group, Ph represents a phenyl group, R represents a methyl group or a phenyl group and both k and l represent natural numbers which are variables within the range of 0.01.ltoreq.l/(k+l).ltoreq.0.2,(B) 1 to 35 parts by weight of a polysiloxane haivng a viscosity of 2 to 500cP at 25.degree. C., said polysiloxane having a general formula ##STR2## in which Me represents a methyl group, and both m and n represent natural numbers which are variables within the range of 0.05.ltoreq.n/(M+n).ltoreq.0.3,(C) 0.Type: GrantFiled: October 19, 1989Date of Patent: March 17, 1992Assignees: Tomoegawa Paper Co., Ltd., Chisso CorporationInventors: Kazuhiro Takayanagi, Masayuki Tsuchida, Atsushi Koshimura, Nobumasa Ohtake, Tamio Kimura
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Patent number: 5047491Abstract: A polyorganosiloxane compound is provided which has a fluorine-containing group at its .alpha.-position and one or more than one hydrosilyl group at its .omega.-position, has a fluorine-containing group located at least at its .alpha.- and .alpha.'-position and one or more than one hydrosilyl group at its .omega.-position or has a fluorine-containing group at least at its .alpha.-, .alpha.'- and .alpha."-position and one or more than one hydrosilyl group at its .omega.-position.Type: GrantFiled: August 1, 1989Date of Patent: September 10, 1991Assignee: Chisso CorporationInventors: Takahiro Saho, Yoshinori Akutsu, Takaharu Nakano, Nobumasa Ohtake
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Patent number: 4996280Abstract: A polyorganosiloxane compound which has a fluorine-containing group at its one terminal and an aminopropyl group at its other terminal.The polyorganosiloxane compound can provide various improved properties as well as new properties to synthetic resins by a chemical connection to the synthetic resins with a functional group or groups reactive with the amino group at the other terminal thereof.Type: GrantFiled: August 1, 1989Date of Patent: February 26, 1991Assignee: Chisso CorporationInventors: Takahiro Saho, Yoshinori Akutsu, Takaharu Nakano, Nobumasa Ohtake
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Patent number: 4992521Abstract: The present invention relates to an organosiloxane compound suitable for the modification of silicone rubbers and synthetic resins, an organosiloxane compound useful as its intermediate, and a process for preparing them. The organosiloxane compound of the present invention can be represented by the general formula (IV) ##STR1## wherein j is an integer of 1 to 2000, R is an alkyl group having 1 to 4 carbon atoms, and R.sup.1 is a pentafluorophenyl group or a straight-chain or a branched fluoroalkyl group represented by the formula (III)C.sub.1 H.sub.b F.sub.2a-b+1 (II)wherein a is an integer of 3 to 18, and b is an integer of 0 to 2a.The siloxane compound of the present invention has a siloxane chain each having a substituent with a fluorine atom containing group at the terminal thereof. Each of molecules constituting the polysiloxane compound of the present invention has a terminal hydrosilyl group portion and a fluorine atom-containing terminal substituent portion therein.Type: GrantFiled: April 21, 1989Date of Patent: February 12, 1991Assignee: Chisso CorporationInventors: Takahiro Saho, Yoshinori Akutsu, Takaharu Nakano, Nobumasa Ohtake
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Patent number: 4987203Abstract: A polyorganosiloxane compound contains a fluorine-containing substituent at least at its .alpha.-, .alpha.'- or .alpha."-position and a substituent having an epoxy linkage at its .omega.-position. The polyorganosiloxane compound can provide a synthetic resin with properties which cannot be provided by conventional polysiloxane compound by incorporating the polyorganosiloxane compound into the synthetic resin through a chemical linkage via the epoxy linkage thereof and a group reactive with the epoxy linkage thereof.Type: GrantFiled: October 24, 1989Date of Patent: January 22, 1991Assignee: Chisso CorporationInventors: Takahiro Saho, Yoshinori Akutsu, Takaharu Nakano, Nobumasa Ohtake
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Patent number: 4839443Abstract: A polysiloxane compound modified with two hydroxyl groups at the one end thereof and particularly suitable for improving the surface characteristics of resins prepared by polycondensation of a polyol with another polyfunctional compound, and a silicone-modified polyurethane having superior characteristics such as low frictional properties, water repellency, oil repellency, thrombosis resistance, etc. and also a process for producing the polyurethane are provided, which polysiloxane compound expressed by the formula ##STR1## wherein R represents H, Me (methyl) or Et (ethyl) and n represents an integer of 0 to 4,000, and which silicone-modified polyurethane is obtained from a compound having at least two isocyanate groups and a compound having at least two hydroxyl groups, and by using as a part of the compound having at least two hydroxyl groups, the polysiloxane compound of the above formula (I) in the urethane bond-forming reaction.Type: GrantFiled: January 14, 1988Date of Patent: June 13, 1989Assignee: Chisso CorporationInventors: Yoshinori Akutsu, Takaharu Nakano, Takahiro Saho, Nobumasa Ohtake, Hirofumi Yasuda, Tamio Kimura
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Patent number: 4822850Abstract: There is here provided a modifier for a resin containing an active hydrogen capable of reacting with an isocyanate group. The modifier of the present invention can give characteristics such as low frictional properties, water repellency, oil repellency and antithrombotic properties to the resin, and when the modifier of the present invention is used, neither bleeding phenomenon nor deterioration in mechanical strength takes place.The present modifier comprises a modified polyorganosiloxane containing an isocyanate group which is represented by the general formula (A) ##STR1## wherein Me is a methyl group, Ph is a phenyl group, R is a methyl or phenyl group, R.sup.1 is H or a methyl group, each of m and n is 0 or more and a value of m+n is within the range of 0 to 600, a is 1, 2 or 3, b is 1, 2 or 3, c is a value of 1 to 300, and Q is a residue obtained by subtracting one isocyanate group from a compound having at least two isocyanate groups.Type: GrantFiled: December 21, 1987Date of Patent: April 18, 1989Assignee: Chisso CorporationInventors: Hirofumi Yashuda, Takahiro Saho, Nobumasa Ohtake, Takaharu Nakano
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Patent number: 4658049Abstract: A novel carboxyl group-containing siloxane compound, whether its molecular weight is low or high, having a superior heat stability, and useful as emulsifying agent, surface modifier for inorganic materials, etc. is provided, which compound is expressed by the general formula ##STR1## wherein R represents an alkyl group of 1 to 4 carbon atoms; R.sup.1 represents R or R.sup.2 ; R.sup.2 represents CH.sub.2 CH.sub.2 CH.sub.2 --OCH.sub.2 CH.sub.2).sub.n COOH; n is an integer of 1 or more; l is an integer of 0 or more; m is an integer of 0 or more; l+m is an integer of 1 or more; and R.sup.1 represents R.sup.2 in the case of m=0.Type: GrantFiled: December 12, 1985Date of Patent: April 14, 1987Assignee: Chisso CorporationInventors: Takaharu Nakano, Nobumasa Ohtake
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Patent number: 4269993Abstract: Novel diaralkyldichlorosilanes expressed by the general formula (I) ##STR1## (wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represent hydrogen atom or an alkyl group having 1.about.4 carbon atoms, but a case where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are all hydrogen atom is excluded),and a process for producing the same are provided.They are useful as monomers for producing polysiloxanes and as intermediates for synthesizing novel organosilicon compounds.Type: GrantFiled: October 15, 1979Date of Patent: May 26, 1981Assignee: Chisso CorporationInventors: Nobumasa Ohtake, Isao Koga, Yohji Terui
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Patent number: 4211704Abstract: A commercial method for producing 2,3,3-trimethylindolenine useful as an intermediate for cationic dyes, etc., with a high yield is provided, which comprises mixing aniline with 3-chloro-3-methylbutane-2-one in a mixing ratio by mol of 3:1-10:1; reacting the resulting mixture at a temperature of 50.degree.-150.degree. C. for 2-20 hours; thereafter elevating the temperature of the reaction liquid; and maintaining the liquid at a reflux temperature of aniline for 0.5-2 hours to complete the reaction.Type: GrantFiled: August 2, 1978Date of Patent: July 8, 1980Assignee: Chisso CorporationInventors: Nobumasa Ohtake, Ryo Yoshizawa, Isao Koga