Patents by Inventor Harumasa Yamasaki
Harumasa Yamasaki 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: 5446527Abstract: A method of forming fixed images includes charging a photoconductor; exposing the photoconductor to light; developing an electrostatic latent image, such that a toner is applied to the electrostatic latent image formed on a transfer film moving in partially close contact with the photoconductor to form a visible image; transferring the formed visible image onto a recording medium such as a recording paper; and fixing the transferred visible image onto the recording medium. The toner is an encapsulated toner, the photoconductor is a heat-resistant photoconductor, and the transfer process and the fixing process are simultaneously carried out on the surface of the heat-resistant photoconductor covered with the transfer film onto the preheated recording medium.Type: GrantFiled: January 12, 1994Date of Patent: August 29, 1995Assignee: Kao CorporationInventors: Shin-ichiro Yasuda, Kuniyasu Kawabe, Mitsuhiro Sasaki, Harumasa Yamasaki
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Patent number: 5352554Abstract: A compound represented by the formula (1): ##STR1## wherein Ar.sub.1 represents an arylene group; Ar.sub.2 and Ar.sub.3 independently represent an aryl group or an arylene group; R.sub.2 and R.sub.3, which may be identical or not, independently represent a hydrogen atom or an alkyl group having a carbon number of 4 or less, or R.sub.2 and R.sub.3 both represent --SiR.sub.4 R.sub.5 R.sub.6 (R.sub.4, R.sub.5 and R.sub.6, which may be identical or not, independently represent an alkyl group, aralkyl group or aryl group which may be substituted); R.sub.1 represents --SiR.sub.7 R.sub.8 R.sub.9 (R.sub.7, R.sub.8 and R.sub.9, which may be identical or not, independently represent an alkyl group, cycloalkyl group, aralkyl group or aryl group which may be substituted, or none (only in the case where R.sub.2 and R.sub.3 represent --SiR.sub.4 R.sub.5 R.sub.6), one or two of R.sub.7, R.sub.8 and R.sub.9 represent the following: ##STR2## wherein Ar.sub.1, Ar.sub.2, Ar.sub.3, R.sub.2 and R.sub.Type: GrantFiled: October 30, 1992Date of Patent: October 4, 1994Assignee: Kao CorporationInventors: Masayuki Mishima, Harumasa Yamasaki, Takashi Matsuse, Tadashi Sakuma, Hiroyasu Togashi
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Patent number: 5290963Abstract: The present invention is directed to a silicon-containing triarylamine compound represented by the formula (1): ##STR1## wherein Q.sub.2 and Q.sub.3 independently represent a hydrogen atom or --CH.sub.2 SiR.sub.1 R.sub.2 R.sub.3 group (R.sub.1, R.sub.2 and R.sub.3, which may be identical or not, independently represent an alkyl group, cycloalkyl group, aralkyl group or aryl group which may be substituted); Ar.sub.1, Ar.sub.2 and Ar.sub.3 independently represent an arylene group which may be substituted; Q.sub.1 represents a --CH.sub.2 SiR.sub.1 R.sub.2 R.sub.3 group, --CH.sub.2 SiR.sub.1 R.sub.2 R.sub.4 group (R.sub.4 represents the following: ##STR2## wherein Q.sub.2 and Q.sub.3 independently represent a hydrogen atom) or --CH.sub.2 SiR.sub.1 R.sub.4 R.sub.4 group, a method of its production and a photoreceptor for electrophotography incorporating it as a charge transport material. The photoreceptor is very excellent in sensitivity and durability.Type: GrantFiled: May 6, 1991Date of Patent: March 1, 1994Assignee: Kao CorporationInventors: Masayuki Mishima, Harumasa Yamasaki, Takashi Matsuse, Tadashi Sakuma, Hiroyasu Togashi
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Patent number: 5187310Abstract: A compound represented by the formula (1): ##STR1## wherein Ar.sub.1 l represents an arylene group; Ar.sub.2 and Ar.sub.3 independently represent an aryl group or an arylene group; R.sub.2 and R.sub.3, which may be identical or not, independently represent a hydrogen atom or an alkyl group having a carbon number of 4 or less, or R.sub.2 and R.sub.3 both represent --SiR.sub.4 R.sub.5 R.sub.6 (R.sub.4, R.sub.5 and R.sub.6, which may be identical or not, independently represent an alkyl group, aralkyl group or aryl group which may be substituted);R.sub.1 represents --SiR.sub.7 R.sub.8 R.sub.9 (R.sub.7, R.sub.8 and R.sub.9, which may be identical or not, independently represent an alkyl group, cycloalkyl group, aralkyl group or aryl group which may be substituted, or none (only in the case where R.sub.2 and R.sub.3 represent --SiR.sub.4 R.sub.5 R.sub.6), one or two of R.sub.7, R.sub.8 and R.sub.9 represent the following: ##STR2## wherein Ar.sub.1, Ar.sub.2, Ar.sub.3, R.sub.2 and R.sub.Type: GrantFiled: March 7, 1991Date of Patent: February 16, 1993Assignee: Kao CorporationInventors: Masayuki Mishima, Harumasa Yamasaki, Takashi Matsuse, Tadashi Sakuma, Hiroyasu Togashi
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Patent number: 5071822Abstract: Disclosed is a recording material employing an electron donating colorless dye and an electron accepting compound, an improvement being present in that said electron accepting compound is a compound represented by the formula: ##STR1## wherein Ar represents a phenyl group, a substituted phenyl group, a benzyl group, a substituted benzyl group, a naphthyl group or a substituted naphthyl group.Type: GrantFiled: September 19, 1990Date of Patent: December 10, 1991Assignee: Kao CorporationInventors: Koichi Nakamura, Tadashi Nakamura, Hideki Yanagi, Harumasa Yamasaki
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Patent number: 5032479Abstract: A photoreceptor useful for electrophotography and comprises (a) an electrically conductive substrate, (b) an electric charge carrier generation layer and (c) an electric charge carrier transport layer containing therein an electric charge carrier transport compound having the formula (1): ##STR1## in which R.sub.1, R.sub.1 ' and R.sub.1 " each are hydrogen, a linear or branched alkyl, a linear or branched alkyl having a substituent(s), an aryl or an aryl having a substituent(s), R.sub.2, R.sub.3, R.sub.2 ', R.sub.3 ', R.sub.2 " and R.sub.3 " each are hydrogen, a linear or branched alkyl, a linear or branched alkyl having a substituent(s), an aryl, an aryl having a substituent(s), an alkenyl, an alkenyl having a substituent(s), a heterocyclic ring or a heterocyclic ring having a substituent(s), R.sub.2 and R.sub.3 may form a ring with their adjacent carbon, R.sub.2 ' and R.sub.3 ' may form a ring with their adjacent carbon and R.sub.2 " and R.sub.Type: GrantFiled: June 15, 1989Date of Patent: July 16, 1991Assignee: KAO CorporationInventors: Masayuki Mishima, Harumasa Yamasaki, Takashi Matsuse, Tadashi Sakuma, Hiroyasu Togashi
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Patent number: 4727097Abstract: A highly reactive, water-absorptive resin is prepared by (1) impregnating a highly water-absorptive resin having carboxyl or carboxylate groups and a water content of 50 percent by weight or lower with a hydrophilic polymer or monomer having a reactive group and (2) polymerizing said monomer or crosslinking said polymer with a crosslinking agent.Type: GrantFiled: March 4, 1986Date of Patent: February 23, 1988Assignee: Kao CorporationInventors: Takatoshi Kobayashi, Harumasa Yamasaki, Yuzo Sumida
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Patent number: 4714719Abstract: A polyurethane is prepared with use of a catalyst comprising a compound having the formula: ##STR1## in which n is an integer of 2 to 12, A is a hydrogen or a group of --CH.sub.2 CHRCH.sub.2 NH.sub.2 and R is hdyrogen or methyl, provided that n is 6 when A is hydrogen. The compound scarcely smells and does not elute out of the polyurethane article. The process is easy to control.Type: GrantFiled: November 4, 1986Date of Patent: December 22, 1987Assignee: Kao CorporationInventors: Harumasa Yamasaki, Masayoshi Morii, Yukinaga Yokota, Akira Mamada, Yoshiyuki Nabata
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Patent number: 4666975Abstract: A polymer in the form of particles is water-insoluble and water-sellable, containing carboxyl or carboxylate groups. It has a physiological saline absorption quantity of 40 to 90 grams per one gram of the polymer, a physiological saline absorption rate of at least 8 ml per 0.3 gram of the polymer, a gel strength of 33 to 200 g/cm2 when it has been swollen to saturation with ion-exchange water. It is useful as an absorbent in a sanitary article.Type: GrantFiled: March 4, 1985Date of Patent: May 19, 1987Assignee: Kao CorporationInventors: Harumasa Yamasaki, Takatoshi Kobayashi, Osamu Ito, Akira Sakurai, Yuzo Sumida
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Patent number: 4524577Abstract: The twisted yarn is prepared by twisting (1) a single yarn comprising a water-insoluble fiber having a degree of water swelling of at least 10 cc/g or (2) a plurality of single yarns comprising a water-insoluble fiber having a degree of water swelling of at least 10 cc/g or a plurality of yarns comprising at least 50% by weight of such single yarns and water-nonswellable yarns so that the twist constant is at least 2.5.Type: GrantFiled: December 10, 1982Date of Patent: June 25, 1985Assignee: Kao CorporationInventors: Osamu Ito, Harumasa Yamasaki, Itsuo Minakata, Kazunori Nishizawa
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Patent number: 4497930Abstract: A highly water absorbent polymer having high resistance to salt solution is prepared by crosslinking a hyrophilic polymer or copolymer having carboxyl and/or carboxylate groups and water content of 10 to 40 wt. % with a crosslinking agent having at least two functional groups capable of reaction with said carboxyl and carboxylate group. An improved hydrophilic polymer is produced by polymerizing a monomer with a persulfate and a hydroperoxide as combined initiators. Another improved hydrophilic polymer is prepared by polymerizing a monomer with a persulfate and adding a hydroperoxide to the resulting polymer.Type: GrantFiled: August 26, 1983Date of Patent: February 5, 1985Assignee: Kao CorporationInventors: Harumasa Yamasaki, Takatoshi Kobayashi, Yuzo Sumida
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Patent number: 4459396Abstract: A process is disclosed for producing a water-absorbent material by dispersing and suspending an aqueous solution of a water-soluble, ethylenically unsaturated monomer in a hydrocarbon or halogenated aromatic hydrocarbon in the presence of an oil-soluble cellulose ester or cellulose ether and then carrying out the polymerization using a water-soluble radical-polymerization initiator, characterized by the feature that one or more water-soluble or water-dispersible surfactants is (are) added to the system during or after the polymerization reaction.Type: GrantFiled: July 28, 1982Date of Patent: July 10, 1984Assignee: Kao Soap Co., Ltd.Inventors: Harumasa Yamasaki, Yuzo Sumida, Shoichiro Harada
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Patent number: 4446261Abstract: Water-insoluble, high water-absorbent polymer beads are prepared by dispersing and suspending an aqueous solution of a water-soluble, ethylenically unsaturated monomer containing a small amount of a crosslinking agent in a dispersion medium of a hydrocarbon or a halogenated aromatic hydrocarbon, carrying out the bead polymerization in the presence of a water-soluble radical polymerization initiator and a protecting colloid comprising a cellulose ester or cellulose ether which is oil-soluble at the polymerization temperature, and separating the resulting beads.Type: GrantFiled: March 22, 1982Date of Patent: May 1, 1984Assignee: Kao Soap Co., Ltd.Inventors: Harumasa Yamasaki, Shoichiro Harada
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Patent number: 4410694Abstract: Carboxymethyl cellulose fibers are manufactured by reacting a starting cellulose with an alkaline solution containing an etherifying agent dissolved therein while the cellulose is filled in a reactor and the solution is circulating by a pump so as to come into continuous contact with the cellulose.Type: GrantFiled: March 4, 1982Date of Patent: October 18, 1983Assignee: Kao Soap Co., Ltd.Inventors: Mutsuo Nakayama, Hiromi Yamaguchi, Harumasa Yamasaki
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Patent number: 4357938Abstract: A disposable diaper comprising a water-absorbing layer located between a liquid-permeable surface sheet and a liquid-impermeable backing sheet, wherein water-absorbing shrinkable fibers, which shrink in the direction of the fiber length and are rendered elastic on absorption of water, are fixed to and extend along the central portion in the lengthwise direction of the disposable diaper in such a manner that the water-absorbing shrinkable fibers are not placed on top of the water-absorbing layer, and wherein means is provided so that the water-absorbing shrinkable fibers become wetted when the diaper is wetted, said water-absorbing shrinkable fibers exhibiting a percent shrinkage of at least 15% and a shrinking force of at least 100 g when said fibers are wetted.Type: GrantFiled: June 26, 1981Date of Patent: November 9, 1982Assignee: Kao Soap Co., Ltd.Inventors: Osamu Ito, Harumasa Yamasaki, Kazunori Nishizawa
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Patent number: 4093776Abstract: Spontaneously cross-linked alkali metal acrylate polymers having a high water-absorbing property and which are safe for contact with the human skin are prepared by a water-in-oil suspension polymerization process, using a sorbitan fatty acid ester having an HLB value of 3 to 6 as a dispersing agent.Type: GrantFiled: September 23, 1977Date of Patent: June 6, 1978Assignee: Kao Soap Co., Ltd.Inventors: Shuzo Aoki, Harumasa Yamasaki