Patents by Inventor Eikatsu Yamaguchi
Eikatsu Yamaguchi 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: 10752773Abstract: The purpose of the present invention is to inhibit a decrease in strength attribute to the interface between a simple-shape portion and a complicated-shape portion. This fiber-reinforced resin composite material comprises: a simple-shape portion formed from at least one sheet-shaped prepreg material obtained by impregnating reinforcing fibers with a resin; and a complicated-shape portion obtained by impregnating reinforcing fibers with a resin, the complicated-shape portion having been integrated with the simple-shape portion. The resin used for the prepreg material comprised the same components as the resin used for the complicated-shape portion.Type: GrantFiled: April 12, 2018Date of Patent: August 25, 2020Assignee: SUBARU CORPORATIONInventors: Naoyuki Sekine, Eikatsu Yamaguchi, Yoshihiro Fukuda, Hiroyasu Ihara
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Publication number: 20180230306Abstract: The purpose of the present invention is to inhibit a decrease in strength attribute to the interface between a simple-shape portion and a complicated-shape portion. This fiber-reinforced resin composite material comprises: a simple-shape portion formed from at least one sheet-shaped prepreg material obtained by impregnating reinforcing fibers with a resin; and a complicated-shape portion obtained by impregnating reinforcing fibers with a resin, the complicated-shape portion having been integrated with the simple-shape portion. The resin used for the preprg material comprised the same components as the resin used for the complicated-shape portion.Type: ApplicationFiled: April 12, 2018Publication date: August 16, 2018Inventors: Naoyuki SEKINE, Eikatsu YAMAGUCHI, Yoshihiro FUKUDA, Hiroyasu IHARA
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Publication number: 20140343191Abstract: The purpose of the present invention is to inhibit a decrease in strength attribute to the interface between a simple-shape portion and a complicated-shape portion. This fiber-reinforced resin composite material comprises: a simple-shape portion formed from at least one sheet-shaped prepreg material obtained by impregnating reinforcing fibers with a resin; and a complicated-shape portion obtained by impregnating reinforcing fibers with a resin, the complicated-shape portion having been integrated with the simple-shape portion. The resin used for the preprg material comprised the same components as the resin used for the complicated-shape portion.Type: ApplicationFiled: September 30, 2011Publication date: November 20, 2014Applicants: JX NIPPON OIL & ENERGY CORPORATION, FUJI JUKOGYO KABUSHIKI KAISHAInventors: Naoyuki Sekine, Eikatsu Yamaguchi, Yoshihiro Fukuda, Hiroyasu Ihara
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Publication number: 20140212658Abstract: Provided are a fiber-reinforced composite material capable of achieving excellent CAI, ILSS, and bending fracture toughness concurrently at high levels, and maintaining a high glass transition temperature of the resin material therein, and prepreg and a benzoxazine resin composition therefor. The composition contains, at a particular ratio, (A) a compound having in its molecule a benzoxazine ring represented by formula (1), (B) an epoxy resin, (C) a curing agent, (D) a toughness improver, and (E) polyamide 12 particles of a particular particle size, and component (D) is dissolved: (R1: C1-C12 chain alkyl group or the like, and H is bonded to at least one of Cs of the aromatic ring at o- or p-position with respect to the carbon atom to which the oxygen atom is bonded).Type: ApplicationFiled: September 30, 2011Publication date: July 31, 2014Applicants: FUJI JUKOGYO KABUSHIKI KAISHA, JX NIPPON OIL & ENERGY CORPORATIONInventors: Yoshihiro Fukuda, Hiroyasu Ihara, Takayuki Matsumoto, Naoyuki Sekine, Eikatsu Yamaguchi
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Publication number: 20110313080Abstract: The invention provides a benzoxazine resin composition having excellent resistance to heat and moisture and providing excellent handleability when made into prepreg, and prepreg and a fiber-reinforced composite material prepared from the composition. The composition contains (A) a compound having in its molecule a benzoxazine ring represented by the formula (1), (B) an epoxy resin, (C) a curing agent, and (D) a toughness improver: (R1: C1 to C12 chain alkyl group, etc., and H is bonded to at least one of C of the aromatic ring at o- or p-position to the carbon atom to which the oxygen atom is bonded).Type: ApplicationFiled: November 26, 2009Publication date: December 22, 2011Applicant: Benzoxazine Resin CompositionInventors: Hiroyasu Ihara, Eikatsu Yamaguchi, Naoyuki Sekine
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Patent number: 7258760Abstract: The invention is to perform operations from sealing of a honeycomb core with a thermosetting sealing material having an adhesive property to its hardening in one step, prevent a resin from flowing into cells of the honeycomb core during resin impregnating operation, and thereby mold low-cost honeycomb sandwich components by using RTM technique which is adopted in molding solid materials, for instance. Dry fabric sheets are stacked on both sides of a honeycomb core with thermosetting sealing members having an adhesive property placed in between, and the sealing members and the dry fabric sheets are heated at the curing temperature of the sealing members to cause initial hardening of the sealing members and to dry the dry fabric sheets. Then, the dry fabric sheets are impregnated with a thermosetting resin and the resin impregnated into the dry fabric sheets is hardened by hot-pressing an entire assembly thus prepared under specific conditions.Type: GrantFiled: April 27, 2004Date of Patent: August 21, 2007Assignee: Fuji Jukogyo Kabushiki KaishaInventors: Eikatsu Yamaguchi, Seiji Maruyama
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Patent number: 7186310Abstract: A method for forming a honeycomb sandwich composite panel comprising dry fabrics, an unpermeating-resin film, a non-low-viscosity-resin film, a honeycomb core, a non-low-viscosity resin film, an unpermeating-resin film and dry fabrics, stacked in this order in a mold. The cells of the honeycomb core are sealed by the laminated films. The unpermeating-resin film prevents the excessive permeation of the resin which forms the laminated films into the dry fabrics and to enhance the adhesion of this resin to the honeycomb core by forming proper fillets of the resin of the laminated sealing films. Further, drying process for drying the dry fabrics enables the application of the RTM process to the formation of the honeycomb sandwich composite panel.Type: GrantFiled: August 1, 2002Date of Patent: March 6, 2007Assignee: Fuji Jukogyo Kabushiki KaishaInventors: Eikatsu Yamaguchi, Seiji Maruyama
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Patent number: 7052572Abstract: There is provided a method for manufacturing a structural body comprising: a structural body formation step of forming the structural body by combining a plurality of constituent members through a bonding adhesive; a closed space formation step of disposing the structural body into a pressurizing or heating unit, forming a closed space with at least one of the structural body and the pressurizing or heating unit, and charging an elastic body into the closed space; a hardening step of fixing or hardening the bonding adhesive through the elastic body by the pressurizing or heating unit; and a discharge step of discharging the elastic body from the closed space.Type: GrantFiled: July 30, 2002Date of Patent: May 30, 2006Assignee: Fuji Jukogyo Kabushiki KaishaInventors: Junji Miura, Atsushi Harada, Seiji Maruyama, Eikatsu Yamaguchi, Yasuhiro Toi
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Publication number: 20040200571Abstract: The invention is to perform operations from sealing of a honeycomb core with a thermosetting sealing material having an adhesive property to its hardening in one step, prevent a resin from flowing into cells of the honeycomb core during resin impregnating operation, and thereby mold low-cost honeycomb sandwich components by using RTM technique which is adopted in molding solid materials, for instance. Dry fabric sheets are stacked on both sides of a honeycomb core with thermosetting sealing members having an adhesive property placed in between, and the sealing members and the dry fabric sheets are heated at the curing temperature of the sealing members to cause initial hardening of the sealing members and to dry the dry fabric sheets. Then, the dry fabric sheets are impregnated with a thermosetting resin and the resin impregnated into the dry fabric sheets is hardened by hot-pressing an entire assembly thus prepared under specific conditions.Type: ApplicationFiled: April 27, 2004Publication date: October 14, 2004Inventors: Eikatsu Yamaguchi, Seiji Maruyama
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Patent number: 6776865Abstract: The invention is to perform operations from sealing of a honeycomb core with a thermosetting sealing material having an adhesive property to its hardening in one step, prevent a resin from flowing into cells of the honeycomb core during resin impregnating operation, and thereby mold low-cost honeycomb sandwich components by using RTM technique which is adopted in molding solid materials, for instance. Dry fabric sheets are stacked on both sides of a honeycomb core with thermosetting sealing members having an adhesive property placed in between, and the sealing members and the dry fabric sheets are heated at the curing temperature of the sealing members to cause initial hardening of the sealing members and to dry the dry fabric sheets. Then, the dry fabric sheets are impregnated with a thermosetting resin and the resin impregnated into the dry fabric sheets is hardened by hot-pressing an entire assembly thus prepared under specific conditions.Type: GrantFiled: December 2, 1999Date of Patent: August 17, 2004Assignee: Fuji Jukogyo Kabushiki KaishaInventors: Eikatsu Yamaguchi, Seiji Maruyama
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Publication number: 20030077410Abstract: A method for forming a honeycomb sandwich composite panel comprising dry fabrics, an unpermeating-resin film, a non-low-viscosity-resin film, a honeycomb core, a non-low-viscosity resin film, an unpermeating-resin film and dry fabrics, stacked in this order in a mold. The cells of the honeycomb core are sealed by the laminated films. The unpermeating-resin film prevents the excessive permeation of the resin which forms the laminated films into the dry fabrics and to enhance the adhesion of this resin to the honeycomb core by forming proper fillets of the resin of the laminated sealing films. Further, drying process for drying the dry fabrics enables the application of the RTM process to the formation of the honeycomb sandwich composite panel.Type: ApplicationFiled: August 1, 2002Publication date: April 24, 2003Inventors: Eikatsu Yamaguchi, Seiji Maruyama
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Publication number: 20030034588Abstract: There is provided a method for manufacturing a structural body comprising: a structural body formation step of forming the structural body by combining a plurality of constituent members through a bonding adhesive; a closed space formation step of disposing the structural body into a pressurizing or heating unit, forming a closed space with at least one of the structural body and the pressurizing or heating unit, and charging an elastic body into the closed space; a hardening step of fixing or hardening the bonding adhesive through the elastic body by the pressurizing or heating unit; and a discharge step of discharging the elastic body from the closed space.Type: ApplicationFiled: July 30, 2002Publication date: February 20, 2003Applicant: Fuji Jukogyo Kabushiki KaishaInventors: Junji Miura, Atsushi Harada, Seiji Maruyama, Eikatsu Yamaguchi, Yasushiro Toi