Patents by Inventor Toshiyuki Aizawa
Toshiyuki Aizawa 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: 9174665Abstract: Provided is simple construction, in a mechanical apparatus such as a rack and pinion steering gear unit, for fastening a bearing that supports thrust loads to a member of the mechanical apparatus using a tapered snap ring, such that there is high rigidity against thrust loads. With the outer ring 17 of the bearing 15 positioned with respect to the housing 11a so that the axial length L27 between the circumferential edge of the axial one side surface 32a of the locking groove 27 and the axial one side surface 34 of the outer ring 17 is less than the maximum thickness T28a of the tapered snap ring 28a, the tapered snap ring 28a is locked into the locking groove 27. The gap 35 is provided between the axial other side surface 31 of the tapered snap ring 28a and the axial other side surface 33 of the locking groove 33.Type: GrantFiled: July 2, 2012Date of Patent: November 3, 2015Assignee: NSK LTD.Inventor: Toshiyuki Aizawa
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Patent number: 8863600Abstract: A rack and pinion steering device which can restrict a pinion shaft from moving in an axial direction even when a snap ring of supporting a thrust load of the pinion shaft is detached or broken, and in which when the snap ring is detached or broken, the pinion shaft is moved to an upper side in the axial direction. Then, a raised portion of the pinion on a side of a lower end face is brought into contact with an outer peripheral face of a rack. The pinion shaft does not move further in the axial direction. Therefore, the thrust load can be supported, and a predetermined performance of the rack and pinion steering device can be maintained.Type: GrantFiled: January 20, 2012Date of Patent: October 21, 2014Assignee: NSK Ltd.Inventor: Toshiyuki Aizawa
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Publication number: 20140116167Abstract: Provided is simple construction, in a mechanical apparatus such as a rack and pinion steering gear unit, for fastening a bearing that supports thrust loads to a member of the mechanical apparatus using a tapered snap ring, such that there is high rigidity against thrust loads. With the outer ring 17 of the bearing 15 positioned with respect to the housing 11a so that the axial length L27 between the circumferential edge of the axial one side surface 32a of the locking groove 27 and the axial one side surface 34 of the outer ring 17 is less than the maximum thickness T28a of the tapered snap ring 28a, the tapered snap ring 28a is locked into the locking groove 27. The gap 35 is provided between the axial other side surface 31 of the tapered snap ring 28a and the axial other side surface 33 of the locking groove 33.Type: ApplicationFiled: July 2, 2012Publication date: May 1, 2014Applicant: NSK LTD.Inventor: Toshiyuki Aizawa
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Publication number: 20120186371Abstract: A rack and pinion steering device which can restrict a pinion shaft from moving in an axial direction even when a snap ring of supporting a thrust load of the pinion shaft is detached or broken, and in which when the snap ring is detached or broken, the pinion shaft is moved to an upper side in the axial direction. Then, a raised portion of the pinion on a side of a lower end face is brought into contact with an outer peripheral face of a rack. The pinion shaft does not move further in the axial direction. Therefore, the thrust load can be supported, and a predetermined performance of the rack and pinion steering device can be maintained.Type: ApplicationFiled: January 20, 2012Publication date: July 26, 2012Applicant: NSK Ltd.Inventor: Toshiyuki AIZAWA
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Publication number: 20110284312Abstract: An electric power steering device is provided with a construction that can suppress the generation of stick slip between the outer peripheral face of a rotation shaft (13), and the inner peripheral face of inner rings (20a, 20b) of rolling bearings (19a, 19b). Therefore, in the present invention a lubricant (24) or an elastomer (25) is interposed between the inner peripheral face of at least one of the inner rings of the inner rings (20a, 20b), and the outer peripheral face of the rotation shaft (13). Additionally in the case where a lubricant (24) is interposed at a part of the rotation shaft (13), there is provided a surface for retaining the lubricant in this part.Type: ApplicationFiled: November 26, 2010Publication date: November 24, 2011Applicant: NSK Ltd.Inventors: Toshiyuki Aizawa, Takeshi Yamamoto
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Patent number: 6291712Abstract: A process for producing a saturated aliphatic carboxylic acid amide, comprising reacting a saturated aliphatic carboxylic acid with ammonia to thereby obtain a saturated aliphatic ammonium carboxylate and subjecting the saturated aliphatic ammonium carboxylate to a dehydration reaction for obtaining a saturated aliphatic carboxylic acid amide, wherein the dehydration reaction of the saturated aliphatic ammonium carboxylate is conducted while supplying water to a reaction system in which the dehydration reaction is carried out. Preferably, water is continuously supplied to the reaction system so that the production of the saturated aliphatic carboxylic acid amide is carried out in a continuous manner and the amount of water present in a steady state ranges from 20 to 70 mol per 100 mol of a total of the saturated aliphatic carboxylic acid, the ammonia, the saturated aliphatic ammonium carboxylate, the saturated aliphatic carboxylic acid amide and the water.Type: GrantFiled: November 26, 1997Date of Patent: September 18, 2001Assignee: Showa Denko K.K.Inventors: Shinya Saihata, Masaaki Katayama, Hitoshi Nakamura, Toshiyuki Aizawa
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Patent number: 6166253Abstract: A process for producing N-(1-alkoxyethyl)carboxylic amides by reacting alcohols of 1-5 carbon atoms with N-vinylcarboxylic amides in the presence of an acidic catalyst, or by utilizing unreacted starting material, unreacted intermediate or unrecovered product for synthesis of N-(1-alkoxyethyl)carboxylic amides. A process for producing N-(1-alkoxyethyl)carboxylic amides by adding a water-soluble strong acid during reaction between a carboxylic amide and a starting material containing acetaldehyde and alcohol and/or a starting material containing an acetal, in an amount of 2.times.10.sup.-3 to 3.times.10.sup.-1 equivalents to 1 mole of the carboxylic amide in the starting material, and using a strongly acidic ion-exchange resin as the catalyst.Type: GrantFiled: September 11, 1998Date of Patent: December 26, 2000Assignee: Showa Denko K.K.Inventors: Toshiyuki Aizawa, Hitoshi Nakamura, Tetsuo Kudo, Etsuko Mitarai
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Patent number: 6153708Abstract: A highly polymerizable N-vinylcarboxylic acid amide having an N-1,3-butadienylcarboxylic acid amide content of 30 ppm or less, a process for producing the same, and a process for producing a homopolymer of N-vinylcarboxylic acid amide or a copolymer thereof with another copolymerizable monomer using the same. Also, a highly polymerizable N-vinyl-carboxylic acid amide is produced by thermal cracking or catalytic cracking of N-(1-alkoxyethyl)carboxylic acid amide or ethylidenebiscarboxylic acid amide, wherein the N-vinyl-carboxylic acid amide content of the N-(1-alkoxyethyl)-carboxylic acid amide or ethylenebiscarboxylic acid amide is 10 wt % or less.Type: GrantFiled: March 18, 1999Date of Patent: November 28, 2000Assignee: Showa Denko Kabushiki KaishaInventors: Toshiyuki Aizawa, Hitoshi Nakamura, Tetsuo Kudo, Kunitoshi Wakabayashi, Kenji Shimamura, Shun-ichi Nagamatsu
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Patent number: 6143836Abstract: A highly polymerizable N-vinylcarboxylic acid amide having an N-1,3-butadienylcarboxylic acid amide content of 30 ppm or less, a process for producing the same, and a process for producing a homopolymer of N-vinylcarboxylic acid amide or a copolymer thereof with another copolymerizable monomer using the same. Also, a highly polymerizable N-vinylcarboxylic acid amide is produced by thermal cracking or catalytic cracking of N-(1-alkoxyethyl)carboxylic acid amide or ethylidenebiscarboxylic acid amide, wherein the N-vinylcarboxylic acid amide content of the N-(1-alkoxyethyl)carboxylic acid amide or ethylenebiscarboxylic acid amide is 10 wt % or less.Type: GrantFiled: October 8, 1998Date of Patent: November 7, 2000Assignee: Showa Denko Kabushiki KaishaInventors: Toshiyuki Aizawa, Hitoshi Nakamura, Tetsuo Kudo, Kunitoshi Wakabayashi, Kenji Shimamura, Shun-ichi Nagamatsu
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Patent number: 6072084Abstract: A highly polymerizable N-vinylcarboxylic acid amide having an N-1,3-butadienylcarboxylic acid amide content of 30 ppm or less, a process for producing the same, and a process for producing a homopolymer of N-vinylcarboxylic acid amide or a copolymer thereof with another copolymerizable monomer using the same. Also, a highly polymerizable N-vinylcarboxylic acid amide is produced by thermal cracking or catalytic cracking of N-(1-alkoxyethyl)carboxylic acid amide or ethylidenebiscarboxylic acid amide, wherein the N-vinylcarboxylic acid amide content of the N-(1-alkoxyethyl)carboxylic acid amide or ethylenebiscarboxylic acid amide is 10 wt % or less.Type: GrantFiled: December 2, 1998Date of Patent: June 6, 2000Assignee: Showa Denko K.K.Inventors: Toshiyuki Aizawa, Hitoshi Nakamura, Tetsuo Kudo, Kunitoshi Wakabayashi, Kenji Shimamura, Shun-ichi Nagamatsu
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Patent number: 5892115Abstract: A highly polymerizable N-vinylcarboxylic acid amide having an N-1,3-butadienylcarboxylic acid amide content of 30 ppm or less, a process for producing the same, and a process for producing a homopolymer of N-vinylcarboxylic acid amide or a copolymer thereof with another copolymerizable monomer using the same. Also, a highly polymerizable N-vinylcarboxylic acid amide is produced by thermal cracking or catalytic cracking of N-(1-alkoxyethyl)carboxylic acid amide or ethylidenebiscarboxylic acid amide, wherein the N-vinylcarboxylic acid amide content of the N-(1-alkoxyethyl)carboxylic acid amide or ethylenebiscarboxylic acid amide is 10 wt % or less.Type: GrantFiled: December 23, 1997Date of Patent: April 6, 1999Assignee: Showa Denko Kabushiki KaishaInventors: Toshiyuki Aizawa, Hitoshi Nakamura, Tetsuo Kudo, Kunitoshi Wakabayashi, Kenji Shimamura, Shun-ichi Nagamatsu
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Patent number: 5852214Abstract: A process for producing N-(1-alkoxyethyl)carboxylic amides by reacting alcohols of 1-5 carbon atoms with N-vinylcarboxylic amides in the presence of an acidic catalyst, or by utilizing unreacted starting material, unreacted intermediate or unrecovered product for synthesis of N-(1-alkoxyethyl)carboxylic amides. A process for producing N-(1-alkoxyethyl)carboxylic amides by adding a water-soluble strong acid during reaction between a carboxylic amide and a starting material containing acetaldehyde and alcohol and/or a starting material containing an acetal, in an amount of 2.times.10.sup.-3 to 3.times.10.sup.-1 equivalents to 1 mole of the carboxylic amide in the starting material, and using a strongly acidic ion-exchange resin as the catalyst.Type: GrantFiled: April 4, 1997Date of Patent: December 22, 1998Assignee: Showa Denko K.K.Inventors: Toshiyuki Aizawa, Hitoshi Nakamura, Tetsuo Kudo, Etsuko Mitarai
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Patent number: 5789619Abstract: A highly polymerizable N-vinylcarboxylic acid amide having an N-1,3-butadienylcarboxylic acid amide content of 30 ppm or less, a process for producing the same, and a process for producing a homopolymer of N-vinylcarboxylic acid amide or a copolymer thereof with another copolymerizable monomer using the same. Also, a highly polymerizable N-vinyl carboxylic acid amide is produced by thermal cracking or catalytic cracking of N-(1-alkoxyethyl)carboxylic acid amide or ethylidenebiscarboxylic acid amide, wherein the N-vinylcarboxylic acid amide content of the N-(1-alkoxyethyl)carboxylic acid amide or ethylenebiscarboxylic acid amide is 10 wt % or less.Type: GrantFiled: January 16, 1996Date of Patent: August 4, 1998Assignee: Showa Denko Kabushiki KaishaInventors: Toshiyuki Aizawa, Hitoshi Nakamura, Tetsuo Kudo, Kunitoshi Wakabayashi, Kenji Shimamura, Shun-ichi Nagamatsu
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Patent number: 5455042Abstract: The subject invention relates to an ointment comprising a homogeneous mixture of polymer or copolymer of N-vinylacetamide, as an essential component, water and/or alcohols, and a pharmacologically active component. The ointment may be coated or plastered onto the skin or mucosa of a human being or animal in order to effect a therapeutic response.Type: GrantFiled: May 27, 1994Date of Patent: October 3, 1995Assignee: Showa Denko Kabushiki KaishaInventors: Yasuyuki Sakai, Noriyuki Suzuki, Tetsuo Kudo, Kuniomi Marumo, Toshiyuki Aizawa, Kunio Imamura, Shuichi Sugita, Kazuo Kanbayashi
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Patent number: 5407996Abstract: A liquid absorption agent for water or organic solvents comprising, as a main component, a crosslinked N-vinylcarboxylic acid amide resin comprising the backbone chain of a homopolymer or copolymer comprising repeating units of the formula shown below crosslinked with a crosslinking agent: ##STR1## wherein R.sup.1, R.sup.2, and R.sup.3 independently represent a hydrogen atom or methyl;X represents a group --COOY, wherein Y represents a hydrogen atom, an alkali metal, C.sub.1 -C.sub.6 alkyl, or lower alkyl substituted with hydroxyl, dialkylamino or quaternary ammonium group; a group --CONHZ, wherein Z represents a hydrogen atom or lower alkyl substituted with a dialkylamino group, quaternary ammonium group, sulfonic acid or an alkali metal salt thereof; cyano, 2-ketopyrrolidinyl, lower alkoxy, lower acyl, lower acyloxy or lower alkyl substituted with sulfonic acid or an alkali metal salt thereof, with a proviso that when R.sup.Type: GrantFiled: February 17, 1994Date of Patent: April 18, 1995Assignee: Showa Denko K.K.Inventors: Toshiyuki Aizawa, Hitoshi Nakamura, Yoshikazu Hosoda
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Patent number: 5362918Abstract: A process for producing acetaldehyde dimethylacetal comprising reacting acetaldehyde and methanol in the presence of an acid catalyst is disclosed, in which the reaction is carried out in a part of a rectification tower while conducting rectification to withdraw the water by-produced from the bottom of the tower and to recover a distillate containing the acetaldehyde dimethylacetal produced from the top of the tower. The distillate is subjected to azeotropic distillation in the presence of n-hexane or cyclohexane to separate methanol as an azeotrope with n-hexane or cyclohexane and a small amount of the acetaldehyde dimethylacetal and to recover high purity acetaldehyde dimethylacetal as a bottom.Type: GrantFiled: April 23, 1993Date of Patent: November 8, 1994Assignee: Showa Denko K.K.Inventors: Toshiyuki Aizawa, Hitoshi Nakamura, Kunitoshi Wakabayashi, Tetsuo Kudo, Hiroyuki Hasegawa
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Patent number: 5344655Abstract: A (co)polymer suitable for bases or auxiliary agents for external application (for example, hydrophilic gels, adhesives, thickeners or excipients) to be coated or plastered onto the skin or mucosa of a human being or animal, such as ointment agents (ointment, hydrogel, jelly or cream), plastering agents (molded poultice, tape agent or plaster agent), sticky bandages (sticky bandage, strap, wound strap, surgical tape, taping material, supporter), and to preparations for external application containing same.Type: GrantFiled: March 17, 1993Date of Patent: September 6, 1994Assignee: Showa Denko K.K.Inventors: Yasuyuki Sakai, Noriyuki Suzuki, Tetsuo Kudo, Kuniomi Marumo, Toshiyuki Aizawa, Kunio Imamura, Shuichi Sugita, Kazuo Kanbayashi
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Patent number: 5338815Abstract: A fine particulate crosslinked type N-vinylcarboxylic acid amide resin having an average particle size of 10 .mu.m or less comprising backbone chains of a homopolymer or copolymer comprising repeating units (A) or (A) and (B) of the formulae: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 each independently represent a hydrogen atom or methyl group; X represents a group --COOY, wherein Y represents a hydrogen atom, an alkali metal, a C.sub.1 -C.sub.Type: GrantFiled: November 30, 1993Date of Patent: August 16, 1994Assignee: Showa Denko K.K.Inventors: Toshiyuki Aizawa, Hitoshi Nakamura, Tetsuhiko Yamaguchi
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Patent number: 5300606Abstract: A liquid absorption agent for water or organic solvents comprising, as a main component, a crosslinked N-vinylcarboxylic acid amide resin comprising the backbone chain of a homopolymer or copolymer comprising repeating units of the formula shown below crosslinked with a crosslinking agent: ##STR1## wherein R.sup.1, R.sup.2, and R.sup.3 independently represent a hydrogen atom or methyl;X represents a group --COOY, wherein Y represents a hydrogen atom, an alkali metal, C.sub.1 -C.sub.6 alkyl, or lower alkyl substituted with hydroxyl, dialkylamino or quaternary ammonium group; a group --CONHZ, wherein Z represents a hydrogen atom or lower alkyl substituted with a dialkylamino group, quaternary ammonium group, sulfonic acid or an alkali metal salt thereof; cyano, 2-ketopyrrolidinyl, lower alkoxy, lower acyl, lower acyloxy or lower alkyl substituted with sulfonic acid or an alkali metal salt thereof, with a proviso that when R.sup.Type: GrantFiled: March 11, 1993Date of Patent: April 5, 1994Assignee: Showa Denko K.K.Inventors: Toshiyuki Aizawa, Hitoshi Nakamura, Yoshikazu Hosoda
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Patent number: 5280095Abstract: A fine particulate crosslinked type N-vinylcarboxylic acid amide resin having an average particle size of 10 .mu.m or less comprising backbone chains of a homopolymer or copolymer comprising repeating units (A) or (A) and (B) of the formulae: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 each independently represent a hydrogen atom or methyl group; X represents a group --COOY, wherein Y represents a hydrogen atom, an alkali metal, a C.sub.1 -C.sub.Type: GrantFiled: June 28, 1991Date of Patent: January 18, 1994Assignee: Showa Denko K.K.Inventors: Toshiyuki Aizawa, Hitoshi Nakamura, Tetsuhiko Yamaguchi