Patents by Inventor Fumiaki Arai
Fumiaki Arai 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: 7201938Abstract: A thermosensitive stencil paper having a thermoplastic resin film and a porous resin layer which is provided on the thermoplastic resin film by coating a porous resin layer formation coating liquid including a water-in-oil emulsion of a resin on the thermoplastic resin film and drying the coating liquid. In addition, the method of producing the above-mentioned thermosensitive stencil paper is also disclosed.Type: GrantFiled: January 30, 2002Date of Patent: April 10, 2007Assignees: Ricoh Company, Ltd., Tohoku Ricoh Co., Ltd.Inventors: Fumiaki Arai, Takehiko Iwaoka, Yuji Natori, Masanori Rimoto
-
Patent number: 6889605Abstract: A heat-sensitive stencil including a resin film on which a thin resin layer and a porous resin layer are formed in succession.Type: GrantFiled: October 5, 2000Date of Patent: May 10, 2005Assignees: Ricoh Company, Ltd., Tohoku Ricoh, Co., Ltd.Inventors: Yuji Natori, Fumiaki Arai, Masanori Rimoto, Tetsuo Tanaka, Hiroshi Tateishi
-
Publication number: 20020102397Abstract: A thermosensitive stencil paper having a thermoplastic resin film and a porous resin layer which is provided on the thermoplastic resin film by coating a porous resin layer formation coating liquid including a water-in-oil emulsion of a resin on the thermoplastic resin film and drying the coating liquid. In addition, the method of producing the above-mentioned thermosensitive stencil paper is also disclosed.Type: ApplicationFiled: January 30, 2002Publication date: August 1, 2002Inventors: Fumiaki Arai, Takehiko Iwaoka, Yuji Natori, Masanori Rimoto
-
Patent number: 6403150Abstract: A heat-sensitive stencil having a thermoplastic resin film, and a porous resin layer formed thereon. The stencil has an air permeability in the range of 1.0 cm3/cm2·sec to 157 cm3/cm2·sec in a portion thereof when the thermoplastic resin film of the portion is perforated to form perforations providing an open ratio SO/SP of at least 0.2, wherein SO represents a total area of the perforations and SP represents the area of the portion. The heat-sensitive stencil is prepared by applying a coating liquid containing the resin of the porous resin layer to the thermoplastic resin film and drying the coating. The coating liquid contains a mixture of a good solvent and a poor solvent less vaporizable than the good solvent so that the porous resin layer is formed after drying.Type: GrantFiled: July 5, 2000Date of Patent: June 11, 2002Assignees: Ricoh Company, Ltd., Tohoku Ricoh Co., Ltd.Inventors: Masayuki Ohta, Takehiko Iwaoka, Fumiaki Arai, Hiroshi Tateishi, Masanori Rimoto, Hideki Ono, Tetsuo Tanaka, Yuji Natori
-
Patent number: 6372332Abstract: A thermosensitive stencil paper having a thermoplastic resin film and a porous resin layer which is provided on the thermoplastic resin film by coating a porous resin layer formation coating liquid including a water-in-oil emulsion of a resin on the thermoplastic resin film and drying the coating liquid. In addition, the method of producing the above-mentioned thermosensitive stencil paper is also disclosed.Type: GrantFiled: December 3, 1998Date of Patent: April 16, 2002Assignees: Ricoh Company, Ltd., Tohoku Ricoh Co., Ltd.Inventors: Fumiaki Arai, Takehiko Iwaoka, Yuji Natori, Masanori Rimoto
-
Patent number: 6096374Abstract: A heat-sensitive stencil having a thermoplastic resin film, and a porous resin layer formed thereon. The stencil has an air permeability in the range of 1.0 cm.sup.3 /cm.sup.2 .multidot.sec to 157 cm.sup.3 /cm.sup.2 .multidot.sec in a portion thereof when the thermoplastic resin film of the portion is perforated to form perforations providing an open ratio S.sub.O /S.sub.P of at least 0.2, wherein S.sub.O represents a total area of the perforations and S.sub.P represents the area of the portion. The heat-sensitive stencil is prepared by applying a coating liquid containing the resin of the porous resin layer to the thermoplastic resin film and drying the coating. The coating liquid contains a mixture of a good solvent and a poor solvent less vaporizable than the good solvent so that the porous resin layer is formed after drying.Type: GrantFiled: August 24, 1998Date of Patent: August 1, 2000Assignees: Ricoh Company, Ltd., Tohoku Ricoh Co., Ltd.Inventors: Masayuki Ohta, Takehiko Iwaoka, Fumiaki Arai, Hiroshi Tateishi, Masanori Rimoto, Hideki Ono, Tetsuo Tanaka, Yuji Natori
-
Patent number: 6092461Abstract: A heat-sensitive stencil including a porous support, and a thermoplastic resin film laminated on the support and having a surface smoothness of at least 10,000 seconds. The stencil is fabricated by bonding a thermoplastic resin film to a porous support with an adhesive having a specific viscosity and a specific volatile matter content, while maintaining each of the support and the film under a specific tension. The stencil may also be fabricated by applying a coating composition containing a resin and first and second solvents having a specific solubility and specific evaporation rates, and drying the applied composition to form a porous support. A printing master is produced by heating the above stencil imagewise by a thermal head with a heating energy of not greater than 0.05 mJ/dot.Type: GrantFiled: December 22, 1999Date of Patent: July 25, 2000Assignees: Ricoh Company, Ltd., Tohoku Ricoh Co., Ltd.Inventors: Tetsuo Tanaka, Hiroshi Tateishi, Fumiaki Arai, Masanori Rimoto, Hiroshi Adachi, Kohichi Ohshima
-
Patent number: 6050183Abstract: A heat-sensitive stencil including a porous support, and a thermoplastic resin film laminated on the support and having a surface smoothness of at least 10,000 seconds. The stencil is fabricated by bonding a thermoplastic resin film to a porous support with an adhesive having a specific viscosity and a specific volatile matter content, while maintaining each of the support and the film under a specific tension. The stencil may also be fabricated by applying a coating composition containing a resin and first and second solvents having a specific solubility and specific evaporation rates, and drying the applied composition to form a porous support. A printing master is produced by heating the above stencil imagewise by a thermal head with a heating energy of not greater than 0.05 mJ/dot.Type: GrantFiled: July 8, 1998Date of Patent: April 18, 2000Assignee: Ricoh Company, Ltd.Inventors: Tetsuo Tanaka, Hiroshi Tateishi, Fumiaki Arai, Masanori Rimoto, Hiroshi Adachi, Kohichi Ohshima
-
Patent number: 5924360Abstract: A stencil base sheet includes a thermoplastic resin film, with a surface of the stencil base sheet on the side of the thermoplastic resin film having a surface smoothness of at least 6000 seconds. From this stencil base sheet, a printing master is prepared by use of a heat-emitting resistor with the application of electric signals thereto with pulse modulation corresponding to image recording density, thereby forming perforations of a different size corresponding to recording image density in the stencil base sheet by thermal fusing. Furthermore, a monochrome or multi-color stencil printing is performed by using the printing master.Type: GrantFiled: June 2, 1997Date of Patent: July 20, 1999Assignees: Ricoh Company, Ltd., Tohoku Ricoh Co., Ltd.Inventors: Hiroshi Adachi, Kouichi Ohshima, Masanori Rimoto, Fumiaki Arai, Hiroshi Tateishi, Tetsuo Tanaka
-
Patent number: 5843560Abstract: A heat-sensitive stencil having a thermoplastic resin film, and a porous resin layer formed thereon. The stencil has an air permeability in the range of 1.0 cm.sup.3 /cm.sup.2 .multidot.sec to 157 cm.sup.3 /cm.sup.2 .multidot.sec in a portion thereof when the thermoplastic resin film of the portion is perforated to form perforations providing an open ratio S.sub.O /S.sub.P of at least 0.2, wherein S.sub.O represents a total area of the perforations and S.sub.P represents the area of the portion. The heat-sensitive stencil is prepared by applying a coating liquid containing the resin of the porous resin layer to the thermoplastic resin film and drying the coating. The coating liquid contains a mixture of a good solvent and a poor solvent less vaporizable than the good solvent so that the porous resin layer is formed after drying.Type: GrantFiled: October 30, 1996Date of Patent: December 1, 1998Assignees: Ricoh Company, Ltd., Tohoku Ricoh Co., Ltd.Inventors: Masayuki Ohta, Takehiko Iwaoka, Fumiaki Arai, Hiroshi Tateishi, Masanori Rimoto, Hideki Ono, Tetsuo Tanaka, Yuji Natori
-
Patent number: 5813329Abstract: In a printer using a stencil, a drum and a stencil feed and discharge unit are constructed integrally with each other. Hence, a stencil can be fed, cut by a thermal head, wrapped around the drum, and then discharged without being cut off. Even a stencil substantially implemented by a thermoplastic resin film, which is thin and soft, can be transported without being creased or otherwise deformed.Type: GrantFiled: June 6, 1995Date of Patent: September 29, 1998Assignees: Ricoh Company, Ltd., Tohoku Ricoh Co., Ltd.Inventors: Hiroshi Tateishi, Fumiaki Arai, Tetsuo Tanaka
-
Patent number: 5707712Abstract: A thermosensitive stencil paper includes a thermoplastic resin film, and optionally a porous support for supporting the resin film thereon, and a silicone oil containing layer formed the resin film, which contains at least one modified silicone oil component selected from the group consisting of (a) an ether.cndot.epoxy-modified silicone oil having both an epoxy group and an ether group and (b) an ether-modified silicone oil with HLB of 6 or less. The above thermosensitive stencil paper can be produced by coating a coating liquid which contains at least one of the above-mentioned modified silicone oils in an amount of 2.0 g/m.sup.2 or less before the drying of the coating liquid.Type: GrantFiled: February 21, 1996Date of Patent: January 13, 1998Assignees: Ricoh Company, Ltd., Tohoku Ricoh Co., Ltd.Inventors: Manabu Fujimura, Fumiaki Arai, Hideyuki Yamaguchi, Masayuki Ohta
-
Patent number: 5378739Abstract: A W/O emulsion ink for use in stencil printing is composed of an oil phase and a water phase with the respective ratios by wt. % thereof being (20 to 40):(80 to 60). The oil phase is composed of a solvent component containing a volatile solvent with an initial boiling point of 150.degree. to 210.degree. C. and a nonvolatile solvent, with the respective ratios by wt. % thereof being (10 to 30):(90 to 70), a coloring agent, a resin, and a surface-active agent, with the amount of the resin in the oil phase being in the range of 2 to 8 wt. % of the total weight of the emulsion.Type: GrantFiled: October 30, 1992Date of Patent: January 3, 1995Assignee: Ricoh Company, Ltd.Inventors: Masahiro Koike, Hitoshi Ueda, Hiroshi Tateishi, Naohito Shimota, Fumiaki Arai
-
Patent number: 5219637Abstract: A thermosensitive stencil paper is composed of a thermosensitive stencil film and an overcoat layer formed thereon which contains a higher-alcohol-ester-modified silicone oil as a sticking-prevention agent. A porous substrate may be attached to the back side of the stencil film by use of an adhesive agent.Type: GrantFiled: January 3, 1992Date of Patent: June 15, 1993Assignee: Ricoh Company, Ltd.Inventors: Fumiaki Arai, Masayasu Nonogaki, Shoichi Sugiyama, Yuji Natori, Hideyuki Yamaguchi
-
Patent number: 5188881Abstract: A thermosensitive stencil paper is composed of a substrate and a thermoplastic resin film formed thereon, which thermoplastic resin film has projections in the surface portion thereof, with a printing roughness (R.sub.p) of 2.2 to 5.0 .mu.m, which is a physical quantity proportional to the average depth of the depressions in the surface portion thereof pressed against a standard surface.Type: GrantFiled: June 20, 1991Date of Patent: February 23, 1993Assignees: Ricoh Company, Ltd., Teijin Ltd.Inventors: Shoichi Sugiyama, Fumiaki Arai, Masayasu Nonogaki, Yuji Natori, Hideyuki Yamaguchi, Hitoshi Ueda, Hiroshi Tomita, Kotaro Kato
-
Patent number: 5091257Abstract: A thermosensitive stencil paper in which a thermoplastic resin layer is formed on a porous tissue paper containing natural fibers therein, serving as a porous substrate, with plant elements contained in the porous tissue paper selected in such a fashion that (1) plant elements having a maximum width ranging from 100 .mu.m to 5 mm, a maximum length ranging from 100 .mu.m to 5 mm, and an area of 7800 .mu.m.sup.2 or more, when measured in a posture which provides a maximum area of the plant element are present in a number of 150 or less in a 100 cm.sup.2 area of the porous tissue paper; and (2) plant elements having a maximum width ranging from 300 .mu.m to 5 mm, a maximum length ranging from 300 .mu.m to 5 mm, and an area of 70,000 .mu.m.sup.2 or more are present in a number of 25 or less in a 100 cm.sup.2 area of the porous tissue paper.Type: GrantFiled: September 7, 1990Date of Patent: February 25, 1992Assignee: Ricoh Company, Ltd.Inventors: Masayasu Nonogaki, Fumiaki Arai, Yuji Natori, Hideyuki Yamaguchi
-
Patent number: 4974513Abstract: A thermal direct master for lithography, which comprises a water-resisting substrate and a thermosensitive recording layer formed thereon, which comprises as the main components an inorganic pigment, a binder agent, a thermofusible material and a hydrophilic modified silicon oil. The above-mentioned hydrophilic modified silicon oil may be selected from the group consisting of a carboxyl-modified silicone oil, an alkyl higher alcohol eseter modified silicone oil, an alcohol-modified silicone oil, polyether-modified silicon oil, and an .alpha.-olefin modified silicone oil.Type: GrantFiled: July 13, 1989Date of Patent: December 4, 1990Assignee: Ricoh Company, Ltd.Inventors: Shiro Yamane, Fumiaki Arai
-
Patent number: 4957808Abstract: A thermal stencil paper for mimeograph comprising a porous support and a plastic film laminated on each other. The thermal stencil paper for mimeograph of this invention contains a novel release layer on the plastic film. The release layer is composed of a specific graft polymer whose branch polymer comprises a fluorocarbon or silicone resin. The graft polymer is prepared by copolymerizing a radically polymerizable monomer constituting a backbone polymer of said graft polymer and a radically polymerizable fluorocarbon or silicone prepolymer which has a polymerizable double bond at one terminal end of its polymer chain.Type: GrantFiled: September 9, 1988Date of Patent: September 18, 1990Assignees: Ricoh Company, Ltd., General Company Ltd.Inventors: Fumiaki Arai, Masaru Kimura
-
Patent number: 4082902Abstract: The present invention provides a spark-recording type printing method and a spark-recording material for use in the method, which printing method comprises the processes of: forming an image on a spark-recording material by the spark-recording method, said spark-recording material comprising a support and a layer of metal deposited thereon by vacuum evaporation, and, if necessary, being provided with a colored layer interposed between said support and metal layer, and if further necessary, being provided with a protective layer which is easy to desensitize and/or a desensitized layer which requires no desensitization treatment as formed on said metal layer; and conducting offset printing by employing said spark-recording material having an image formed thereon as a master either after subjecting it to desensitization treatment when it is not provided with said desensitized layer or directly when it is provided with said desensitized layer.Type: GrantFiled: September 10, 1974Date of Patent: April 4, 1978Assignee: Kabushiki Kaisha RicohInventors: Akira Suzuki, Keiji Kubo, Suguru Kunitake, Fumiaki Arai