Patents by Inventor Tadashi Nakajima
Tadashi Nakajima 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: 6814892Abstract: An ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C. of 20 to 50, and which has less compression set and is suitable as a material for a transfer member, a primary transfer member, a secondary transfer member, a cleaning member for image formation bodies, a bias member, a backup member, etc.; an electroconductive ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C.Type: GrantFiled: April 11, 2003Date of Patent: November 9, 2004Assignee: Bridgestone CorporationInventors: Chikara Yamada, Toshiyuki Osaki, Tadashi Nakajima, Takahiro Kawagoe
-
Publication number: 20030201425Abstract: An ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C. of 20 to 50, and which has less compression set and is suitable as a material for a transfer member, a primary transfer member, a secondary transfer member, a cleaning member for image formation bodies, a bias member, a backup member, etc.; an electroconductive ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C.Type: ApplicationFiled: April 11, 2003Publication date: October 30, 2003Applicant: Bridgestone CorporationInventors: Chikara Yamada, Toshiyuki Osaki, Tadashi Nakajima, Takahiro Kawagoe
-
Patent number: 6579473Abstract: An ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C. of 20 to 50, and which has less compression set and is suitable as a material for a transfer member, a primary transfer member, a secondary transfer member, a cleaning member for image formation bodies, a bias member, a backup member, etc.; an electroconductive ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C.Type: GrantFiled: October 19, 2000Date of Patent: June 17, 2003Assignee: Bridgestone CorporationInventors: Chikara Yamada, Toshiyuki Osaki, Tadashi Nakajima, Takahiro Kawagoe
-
Patent number: 6572791Abstract: There is disclosed an elastic member constituted of polyurethane foam obtained by agitationally mixing with water, a urethane prepolymer synthesized from a polyol and a polyisocyanate, characterized by simultaneously employing as polyols, a (A) polymer polyol synthesized from a polyether polyol as a basis, comprising at least 70% by weight of oxypropylene moiety; and a (B) hydrophilic polyether polyol comprising at least 50% by weight of oxyethylene moiety, or simultaneously employing as polyols, the component (A), the component (B) and a (C) polyether polyol comprising at least 70% by weight of oxypropylene moiety. The above elastic member is simultaneously imparted with excellent characteristics such as low hardness, fine cells, low residual compressive strain, high strength and the like. The polyurethane foam which constitutes the elastic member can be produced by free foaming.Type: GrantFiled: December 7, 2000Date of Patent: June 3, 2003Assignee: Bridgestone CorporationInventors: Junji Sakata, Hirotaka Yamazaki, Tadashi Nakajima, Takahiro Kawagoe
-
Publication number: 20010003757Abstract: There is disclosed an elastic member constituted of polyurethane foam obtained by agitationally mixing with water, a urethane prepolymer synthesized from a polyol and a polyisocyanate, characterized by simultaneously employing as polyols, a (A) polymer polyol synthesized from a polyether polyol as a basis, comprising at least 70% by weight of oxypropylene moiety; and a (B) hydrophilic polyether polyol comprising at least 50% by weight of oxyethylene moiety, or simultaneously employing as polyols, the component (A), the component (B) and a (C) polyether polyol comprising at least 70% by weight of oxypropylene moiety. The above elastic member is simultaneously imparted with excellent characteristics such as low hardness, fine cells, low residual compressive strain, high strength and the like. The polyurethane foam which constitutes the elastic member can be produced by free foaming.Type: ApplicationFiled: December 7, 2000Publication date: June 14, 2001Applicant: Bridgestone CorporationInventors: Junji Sakata, Hirotaka Yamazaki, Tadashi Nakajima, Takahiro Kawagoe
-
Patent number: 5985920Abstract: A fluorine-containing prostaglandin derivative of the formula (1) (or a salt thereof) and a medicine containing it, particularly, a preventive or therapeutic medicine for an eye disease: ##STR1## wherein A is a vinylene group or the like, R.sup.1 is an aryloxyalkyl group or the like, R.sup.2 and R.sup.3 are hydrogen atoms or the like, and Z is OR.sup.4 (wherein OR.sup.4 is a hydrogen atom or an alkyl group) or the like.Type: GrantFiled: August 3, 1998Date of Patent: November 16, 1999Assignees: Asahi Glass Company Ltd., Santen Pharmaceutical Co., Ltd.Inventors: Eiichi Shirasawa, Masaaki Kageyama, Tadashi Nakajima, Takashi Nakano, Nobuaki Mori, Hideshi Sasakura, Yasushi Matsumura, Yoshitomi Morizawa
-
Patent number: 5933693Abstract: An electroconductive elastic member including an electroconductive material prepared from a polyurethane foam or polyurethane elastomer using a polyester polyol and a quaternary ammonium salt to impart electroconductivity. The polyurethane foam or polyurethane elastomer can be produced using, as a polyisocyanate component, a hydrogenated product from diphenyl-methane diisocyanate, hexamethylene diisocyanate, or any of various modified diphenylmethane/hexamethylene diisocyanate The elastic member may be used in an electrophotographic apparatus. Thus the member is well suited for producing an elastic roller with intermediate electric resistance in an electrophotographic process.Type: GrantFiled: February 10, 1998Date of Patent: August 3, 1999Assignee: Bridgestone CorporationInventors: Junji Sakata, Tadashi Nakajima, Takahiro Kawagoe
-
Patent number: 5911099Abstract: There are disclosed an electroconductive member comprising a high-molecular material, e.g. polyurethane as a matrix and a quaternary ammonium salt of an organic acid, e.g. bis-or-mono(quaternary ammonium) oxalate; and an electrophotographic apparatus which makes use of the electroconductive member, especially in the form of an electroconductive roller as a developing member, image transfer member, etc. The electroconductive member, when used in electrophotographic mechanism, minimizes an increase in electric resistance at the time of normal continuous passage of an electric current and also variation range in the electric resistance between the circumstances of low temperature/humidity and those of high temperature/humidity.Type: GrantFiled: October 29, 1997Date of Patent: June 8, 1999Assignee: Bridgestone CorporationInventors: Tadashi Nakajima, Junji Sakata, Takahiro Kawagoe
-
Patent number: 5886035Abstract: A fluorine-containing prostaglandin derivative of the formula (1) (or a salt thereof) and a medicine containing it, particularly, a preventive or therapeutic medicine for an eye disease: ##STR1## wherein A is a vinylene group or the like, R.sup.1 is an aryloxyalkyl group or the like, R.sup.2 and R.sup.3 are hydrogen atoms or the like, and Z is OR.sup.4 (wherein OR.sup.4 is a hydrogen atom or an alkyl group) or the like.Type: GrantFiled: December 18, 1997Date of Patent: March 23, 1999Assignees: Asahi Glass Company Ltd., Santen Pharmaceutical Co., Ltd.Inventors: Eiichi Shirasawa, Masaaki Kageyama, Tadashi Nakajima, Takashi Nakano, Nobuaki Mori, Hideshi Sasakura, Yasushi Matsumura, Yoshitomi Morizawa
-
Patent number: 5719375Abstract: A Stiffener manufacturing method and apparatus appropriate for manufacturing a stiffener such as a flat bar is disclosed. The stiffener manufacturing method is composed of a steel plate arrangement step, a strip-cutting step and a pattern cutting step, which are performed in a predetermined interval of time at a position.Type: GrantFiled: January 11, 1995Date of Patent: February 17, 1998Assignee: Samsung Heavy Industries Co., Ltd.Inventors: Kun Peo Sung, Ki Soo Kim, Seong Gi Park, Hogu Kim, Tadashi Nakajima, Masamichi Kawakami, Mitsunobu Hanyu, Yoshihiro Suzuki
-
Patent number: 5659854Abstract: A charging device for electrically charging a photoconductor drum includes a charging member adapted to be placed in contact with the drum and an element for applying voltage between the charging member and the drum. The charging member has a microhardness of 1-65 degrees at its surface in contact with the drum or at least a surface layer of the charging member in contact with the drum is formed of a polyurethane which is prepared from liquid MDI as an isocyanate component and a polyol.Type: GrantFiled: August 30, 1995Date of Patent: August 19, 1997Assignee: Bridgestone CorporationInventors: Yoshitomo Masuda, Hiroshi Kaneda, Tadashi Nakajima, Taro Miyamoto, Yuko Maeda, Yasushi Inoue, Takahiro Kawagoe
-
Patent number: 5183543Abstract: There is provided a polyaniline having a thickness of 0.3 to 5 mm which is suitable for an electronic material, particularly for an electrode material in a cell. Also provided is a cell comprising a positive electrode, a negative electrode and an electrolyte in which the polyaniline having a thickness of 0.3 to 5 mm is employed in at least one of the positive and negative electrodes, the cell having a high energy density and good cell performance stable for a long period of time.Type: GrantFiled: May 15, 1986Date of Patent: February 2, 1993Assignee: Bridgestone CorporationInventors: Shinichi Toyosawa, Tadashi Nakajima, Kinya Suzuki, Takahiro Kawagoe, Tadaaki Miyazaki, Takashi Kitamura, Tadashi Fuse, Masao Ogawa, Yoshitomo Masuda, Hideharu Daifuku, Ryota Fujio
-
Patent number: 5178952Abstract: A radiation curable resin having at least two (meth)acryloyl groups at both terminal ends of a molecular chain which is obtained by reaction of (1) a polyester polyol and/or polycarbonate polyol, (2) a diisocyanate, (3) a polyfunctional (meth)acrylate containing a hydroxyl group therein, and optionally (4) a compound having at least two active hydrogens in the molecule is disclosed. The resin has at least two (meth)acryloyl groups at a terminal end of the molecular chain. The molecular weight of the resin is 1,000 to 50,000, the urethane bonding concentration is not more than 3,000 equivalent/10.sup.6 g and the (meth)acryloyl group concentration is 100 to 6,000 equivalent/10.sup.6 g. A radiation curable resin composition containing the resin and a precoated metal using the composition are also disclosed.Type: GrantFiled: March 30, 1990Date of Patent: January 12, 1993Assignee: Toyo Boseki Kabushiki KaishaInventors: Shinpei Yamamoto, Hideyuki Ohashi, Tadashi Nakajima, Nobukazu Kotera, Takuma Kobayashi, Hiroshi Taki, Masami Oka
-
Patent number: 5120917Abstract: The invention provides a composition for preventing the formation of scales in resistance welding, the composition containing as the active component a reaction product prepared by reacting 1 mole of tetraethyl silicate and about 0.5 to about 1.5 moles of water, and a composition for preventing the formation of scales in arc welding, the composition containing as the active component a reaction product prepared by reacting 1 mole of tetraethyl silicate, about 1 to about 30 moles of triethyl borate and about 0.5 to about 1.5 moles of water.Type: GrantFiled: August 2, 1991Date of Patent: June 9, 1992Assignee: Ishihara Chemical Co., Ltd.Inventors: Tadao Komatsu, Tadashi Nakajima
-
Patent number: 4904842Abstract: In lap joint welding of galvanized sheets, the occurence of blowhole and pit is prevented by applying a blowhole.multidot.pit preventing agent comprising a phosphorus compound as an effective ingredient prior to the arc-welding.Type: GrantFiled: October 21, 1987Date of Patent: February 27, 1990Assignee: Kawasaki Steel CorporationInventors: Koichi Yasuda, Shosaburo Nakano, Noboru Nishiyama, Takaro Matsumoto, Katsuaki Nakatsuji, Tadao Komatsu, Tadashi Nakajima
-
Patent number: 4904553Abstract: A polyaniline is highly conductive and less corrosive when it contains up to 7 mol % of benzenoid-ammonium salt state and up to 25 mol % of quinoid-diimine state, based on the total molar amount of the polyaniline.Type: GrantFiled: June 24, 1988Date of Patent: February 27, 1990Assignee: Bridgestone CorporationInventors: Tadashi Nakajima, Shinichi Toyosawa, Shigeru Kijima, Katsuhiko Arai, Yuko Maeda, Masao Ogawa, Takahiro Kawagoe, Yasuhiro Iino, Ryuzo Osawa, Yuichi Ishino
-
Patent number: 4339442Abstract: There disclose a group of new saponins designated as gynosaponins which have been isolated from a plant of Gynostemma pentaphyllum Makino of Cucurbitaceae, pharmaceutical use thereof and a method for isolating gynosaponins.Type: GrantFiled: November 7, 1980Date of Patent: July 13, 1982Inventors: Tsunematsu Takemoto, Shigeru Arichi, Shigenobu Arihara, Tadashi Nakajima, Megumi Okuhira, Yoshihiro Uchida
-
Patent number: 4263286Abstract: A therapeutic agent for treating consciousness disorder and perception and movement which comprises as an essential active ingredient a phosphatidic acid derivative selected from a phosphatidylcholine, a phosphatidic acid and a phosphatidylethanolamine in admixture with a conventional carrier. Said agent is administered to the patient suffered from consciousness disorder and perception and movement disorder, particularly the post-traumatic syndrome of the head injury and the sequelae of apoplexy or whiplash injury in oral or parenteral route, preferably in an intravenous route.Type: GrantFiled: May 5, 1980Date of Patent: April 21, 1981Assignee: Nippon Shoji Kaisha, Ltd.Inventors: Tadashi Nakajima, Kyoji Rikimi, Yasuji Soda, Kenichi Kashima, Akira Miyamoto, Yoshikazu Soejima
-
Patent number: 4228383Abstract: A speed control circuit arrangement for controlling a rotational speed of an AC commutator motor by an AC controlled rectifier element. The speed control circuit arrangement comprises a pulse transformer which is connected at the secondary winding to the control electrode of the AC controlled rectifier element and one of two main electrodes of the controlled rectifier element and supplies a trigger pulse to the control electrode, a variable resistor for adjusting the rotational speed of the motor, a first capacitor connected at one end through the variable resistor to the other main electrode and at the other end to one end of an AC power source, a pulse generating element connected across said first capacitor with the primary winding of the pulse transformer intervening therebetween, and a first resistor connected at one end to the one main electrode and at the other end to the other end of the AC power source through the first capacitor.Type: GrantFiled: December 28, 1978Date of Patent: October 14, 1980Assignee: Yamamoto Electric Industries, Ltd.Inventors: Katsuji Soeda, Mitsuhiro Oyama, Fumio Sakuma, Tadashi Nakajima
-
Patent number: 4130571Abstract: Improved process for preparing 1,2-diacyl-3-glycerylphosphorylcholines, wherein the diacyl groups are, different or the same, a residue of a saturated or unsaturated fatty acid, particularly one of the acyl groups being a residue of a highly unsaturated fatty acid or being a residue of a saturated or unsaturated fatty acid labelled with an isotope, which comprises acylating a glyceryl-phosphorylcholine or monoacyl derivative thereof or the salt thereof with an acylating agent (e.g. 1-acylimidazole or 4-acyl-3-phenyl-1,2,4-oxadiazol-5-one) in the presence of a catalyst (e.g. an alkali salt of a nitrogen-containing 5-membered heterocyclic compound or sodium oxide).Type: GrantFiled: January 26, 1976Date of Patent: December 19, 1978Assignee: Nippon Shoji Kaisha, Ltd.Inventors: Tadashi Nakajima, Yasuji Soda, Kenichi Kashima, Haruyoshi Kudoh, Akira Miyamoto