Patents by Inventor Yoshiaki Togawa
Yoshiaki Togawa 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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Publication number: 20030102628Abstract: An object of the invention is to provide an impact energy absorbing structure in the form of resin moldings such as interior components of automobiles and other impact energy absorbing structures, with better impact properties, particularly the performance in absorbing impact energy to passenger heads. The invention relates to an impact energy absorbing structure for absorbing the kinetic energy of a colliding object by means of its own deformation, wherein when a certain colliding object collides with the impact energy absorbing structure at a certain velocity, the relationship between dimensionless displacement D, where the deformation of the impact energy absorbing structure is normalized by the permissible deformation, and the dimensionless energy E, where the kinetic energy absorbed by the impact energy absorbing structure is normalized by the kinetic energy of the colliding object prior to collision, meets E>D.Type: ApplicationFiled: September 20, 2002Publication date: June 5, 2003Applicant: Sumitomo Chemical Company, LimitedInventors: Tomoo Hirota, Yoshiaki Togawa
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Publication number: 20020113964Abstract: The present invention provides a particle size distribution measuring apparatus which can enhance the precision and the reliability of measurements by eliminating the region of the particle size having inferior measuring precision and resolution.Type: ApplicationFiled: February 15, 2002Publication date: August 22, 2002Applicant: Horiba, Ltd.Inventor: Yoshiaki Togawa
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Publication number: 20020041376Abstract: The present invention provides a light scattering particle size distribution measuring apparatus, which does not require a burdensome optical axis adjustment of operator for every measurement and which is capable of maintaining a state most suitable for measuring.Type: ApplicationFiled: October 9, 2001Publication date: April 11, 2002Applicant: Horiba, Ltd.Inventors: Takuji Kurozumi, Yoshiaki Togawa
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Publication number: 20010053451Abstract: There are disclosed:Type: ApplicationFiled: March 28, 2001Publication date: December 20, 2001Inventors: Yoshiaki Togawa, Tohru Yabe
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Publication number: 20010028949Abstract: In producing an injection molded product by making a molten material flow from a cylinder through a plurality of gates in a die into a cavity and thereby filling the cavity with the molten material, a part of the flows of the molten material coming from a part of the gates is decreased or stopped before the flows of the molten material coming from a plurality of gate attain confluence in the cavity, and the flows of the molten material are made confluent by the flowing action of the flow(s) of the molten material coming from residual gate(s). According to the process of the present invention, the problem of mechanical properties in the injection molded products can be solved without adding any new apparatus to a general-purpose injection molding machine.Type: ApplicationFiled: January 30, 2001Publication date: October 11, 2001Inventors: Yoshiaki Togawa, Toshitsugu Kikuchi, Shinichi Nagaoka
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Publication number: 20010026867Abstract: There Is provided: (1) a thermoforming mold having a surface roughness (Ra) of not more than 0.Type: ApplicationFiled: December 20, 2000Publication date: October 4, 2001Inventors: Tsuyoshi Kayanoki, Kenichi Higashi, Yoshiaki Togawa
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Patent number: 6252658Abstract: A particle size distribution measuring apparatus includes a source of laser light for providing a laser beam to a sample cell that can hold a sample to be measured. A condenser lens converges the laser beam towards the sample cell along an optical axis. The position on the other side of the sample cell is a ring detector unit that can be aligned with the optical axis to measure light intensity at relatively small scattering angles from contact with particles in the sample cell. An array of detectors can be operatively positioned on a substrate with appropriate amplifying multiplying and analog to digital conversion capacity for measuring light intensity at relatively large scatter angles. The outputs of the ring detector unit and the array of detectors can be used to determine the particle size distribution of particles in the sample.Type: GrantFiled: October 8, 1999Date of Patent: June 26, 2001Assignee: Horiba, Ltd.Inventors: Yoshiaki Togawa, Tatsuo Igushi, Toshiya Ito, Yukio Sakai
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Patent number: 6236458Abstract: A particle distribution size measuring apparatus incorporates a detector array having a plurality of light detecting elements located on a substrate. A first group of detector elements have a plurality of sectors with a common sector angle, while at least one other detector element is positioned furthest from an optical axis and has a smaller sector angle. Each of the detector elements can be formed on a single substrate and their position and alignment have increased the efficiency of manufacturing the arrays.Type: GrantFiled: November 19, 1999Date of Patent: May 22, 2001Assignee: Horiba, Ltd.Inventors: Tatsuo Igushi, Yoshiaki Togawa
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Patent number: 6099055Abstract: A bumper reinforcing structural unit that can be manufactured at low cost, and provides superior impact resistance in a light weight body. The bumper reinforcing structural unit made of a polymeric resin includes a frame body portion having an upper plate, a lower plate and two end plates for forming an interior space therein. Transverse partition plates divide the interior space of the frame body portion along a longitudinal direction into a central space and two end spaces. A front plate covers the front of the central space, and two back plates cover the back of the end spaces.Type: GrantFiled: August 4, 1999Date of Patent: August 8, 2000Assignee: Sumitomo Chemical Company, LimitedInventors: Tomoo Hirota, Toru Yabe, Yoshiaki Togawa
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Patent number: 6080463Abstract: An impact energy absorptive structures is made of usual plastic materials suitable for molding processing, and is designed to suit different degrees of impact loading anticipated in various applications. The impact energy absorptive structures is composed of a base member 11 and protruding rib members including long and short members, in which the proportion of the cross sectional area of the long rib members is between 0.3 to 0.8 of the total cross sectional area of the rib members. Other design modifications can be made readily to customize the impact resistance of the impact energy absorptive structures.Type: GrantFiled: February 17, 1999Date of Patent: June 27, 2000Assignee: Sumitomo Chemical Co., Ltd.Inventors: Yoshiaki Togawa, Masahito Matsumoto, Makoto Nagata, Toru Yabe
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Patent number: 6061131Abstract: A light scattering particle size distribution measuring apparatus inches a light source for providing a beam of light to contact with a sample cell holding a specimen. A detector assembly includes a first set of detector assembly includes a first set of detector elements for receiving scattered and/or diffracted light from the sample cell and a second set of detector elements positioned between the first set of detector elements. A removable scattering and/or diffracting target member can be positioned on the optical axis to provide a predetermined scattered and/or diffraction pattern to the detector assembly whereby the second set of detector elements can measure the predetermined fraction pattern to enable a movement of one of the light source and the detector assembly to align them on an optical axis.Type: GrantFiled: January 8, 1997Date of Patent: May 9, 2000Assignee: Horiba, Ltd.Inventors: Tatsuo Igushi, Yoshiaki Togawa
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Patent number: 6001287Abstract: A thermoplastic resin is molded by a press-molding method wherein a thermoplastic resin in a molten state is compressed to flow between a pair of female and male molds so as to be formed into a predetermined shape. A compression rate of the mold is controlled so that the following expression (1) is satisfied:0.5.ltoreq.B/A.ltoreq.2 (1)wherein A (mm/s.sup.2) is an acceleration which is realized at a time when the compression rate is 75% of a maximum rate in a compression-acceleration region, which region is defined as a period of time from a moment when the compression of the molten thermoplastic resin is started to a moment when the compression rate reaches the maximum rate; and B (mm/s.sup.2) is a deceleration which is realized at a time when the compression rate is 75% of the maximum rate in a compression-deceleration region, which region is defined as a period of time from a moment when the compression rate reaches the maximum rate to a moment when the closing of the molds is complete.Type: GrantFiled: June 16, 1998Date of Patent: December 14, 1999Assignee: Sumitomo Chemical Company, LimitedInventors: Masahito Matsumoto, Masaaki Tsutsubuchi, Takeo Kitayama, Yukito Nakamura, Yoshiaki Togawa
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Patent number: 5937767Abstract: A plastic pallet comprises a pair of deck boards opposed to each other in parallel with each other, a pair of outer girder portions respectively disposed at a pair of opposite side portions of the deck boards, an inner girder portion placed midway between the outer girder portions, and a plurality of reinforcement ribs disposed on respective inner surfaces of said deck boards. Each of the outer girder portions includes a side wall and a first partition wall disposed between the deck boards. The inner girder portion includes a pair of second partition walls which are disposed in parallel with each other with a predetermined distance. The reinforcement ribs existing within a range of a distance extending inward and outward from the first partition wall have a total weight greater than the total weight of the reinforcement ribs existing within a range of the distance extending outward and inward from the second partition wall.Type: GrantFiled: March 31, 1997Date of Patent: August 17, 1999Assignee: Sumitomo Chemical Company LimitedInventors: Yoshiaki Togawa, Toshitsugu Kikuchi, Tohru Yabe, Shinichi Nagaoka
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Patent number: 5925435Abstract: An impact energy absorptive structure is made of usual plastic materials suitable for molding processing, and is designed to suit different degrees of impact loading anticipated in various applications. The impact energy absorptive structure is composed of a base member 11 and protruding rib members including long and short members, in which the proportion of the cross sectional area of the long rib members is between 0.3 to 0.8 of the total cross sectional area of the rib members. Other design modifications can be made readily to customize the impact resistance of the impact energy absorptive structures.Type: GrantFiled: October 4, 1995Date of Patent: July 20, 1999Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiaki Togawa, Masahito Matsumoto, Makoto Nagata, Toru Yabe
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Patent number: 5795510Abstract: A thermoplastic resin is molded by a press-molding method wherein a thermoplastic resin in a molten state is compressed to flow between a pair of female and male molds so as to be formed into a predetermined shape. A compression rate of the mold is controlled so that the following expression (1) is satisfied:0.5.ltorsim.B/A.ltorsim.2 (1)wherein A (mm/s.sup.2) is an acceleration which is realized at a time when the compression rate is 75% of a maximum rate in a compression-acceleration region, which region is defined as a period of time from a moment when the compression of the molten thermoplastic resin is started to a moment when the compression rate reaches the maximum rate; and B (mm/s.sup.2) is a deceleration which is realized at a time when the compression rate is 75% of the maximum rate in a compression-deceleration region, which region is defined as a period of time from a moment when the compression rate reaches the maximum rate to a moment when the closing of the molds is complete.Type: GrantFiled: October 9, 1996Date of Patent: August 18, 1998Assignee: Sumitomo Chemical Company, LimitedInventors: Masahito Matsumoto, Masaaki Tsutsubuchi, Takeo Kitayama, Yukito Nakamura, Yoshiaki Togawa
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Patent number: 5756017Abstract: In a method of simulating flow behavior of a resin in a process for press-molding the resin by use of a press-molding machine comprising a press apparatus equipped with a hydraulic circuit, and first and second molds at least one of which is connected to the press apparatus, disclosed is a method comprising a step of determining, from a characteristic of the hydraulic circuit, an elastic coefficient of the press apparatus, and an apparent elastic coefficient of the resin, a true compression rate imparted to the resin by the press apparatus, and a step of sequentially analyzing, based on the true compression rate, flow behavior of the resin.Type: GrantFiled: September 6, 1996Date of Patent: May 26, 1998Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiaki Togawa, Masaaki Tsutsubuchi, Masahito Matsumoto, Yukito Nakamura, Takeo Kitayama
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Patent number: 5618607Abstract: A plastic-made reinforced structure comprising a thermoplastic resin-made plate and cylindrical hollow rib(s) made of the same resin as that of said plate, connected to at least one side of said plate perpendicularly to the side so that the plate and the rib(s) form one piece, in which structure the following relationships hold:d.sub.1 .gtoreq.20 mm,1>d.sub.1 /d.sub.2 .gtoreq.0.7,H.gtoreq.30 mm,1.gtoreq.d.sub.1 /H.gtoreq.0.3, and1>t.sub.1 /t.sub.2 >0.3wherein d.sub.1 and d.sub.2 are the inside and outside diameters of each rib at the root of the rib, i.e. the joint of the rib to the plate; H is the length of each rib from the root to the front end; and t.sub.1 and t.sub.2 are the rib thicknesses at the front end and at the root.Type: GrantFiled: April 25, 1995Date of Patent: April 8, 1997Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiaki Togawa, Masahito Matsumoto, Makoto Nagata, Tohru Yabe
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Patent number: 5428443Abstract: A particle-size distribution measuring apparatus and method is provided for suspending a sample containing particles in a fluid and introducing the suspended particles into a sample cell. The sample cell is illuminated with light from a laser source and the diffracted light from the particles is measured by an optical detector array. A computer circuit is capable of computing a plurality of graphs of particle-size distribution in repetitive measurement over a predetermined time period. A video display discloses the plurality of graphs in a juxtapositioned arrangement or stacked arrangement to enable the observer to distinguish between any variations in adjacent graphs.Type: GrantFiled: October 8, 1993Date of Patent: June 27, 1995Assignee: Horiba, Ltd.Inventors: Hiroyuki Kitamura, Yoshiaki Togawa, Juichiro Ukon
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Patent number: 5212393Abstract: A sample cell for use in measuring the particle size distribution of samples using diffraction-scattering measurement methods has a radiating surface which is beveled to increase the angle of incidence of scattered light which is scattered at a large scattering angle such that it is transmitted through the radiating surface of the sample cell and thereby allowed to impinge upon a detector.Type: GrantFiled: August 6, 1992Date of Patent: May 18, 1993Assignee: Horiba, Ltd.Inventors: Yoshiaki Togawa, Tatsuo Igushi, Koichiro Matsuda
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Patent number: 5185641Abstract: An apparatus for measuring a wide range of particle sizes in of a sample fluid with two separate light sources is provided. The individual light sources can be compensated to take into account any variations in transmission factors through the sample fluid prior to calculating the particle size distribution. Additionally, any fluctuations in the light source can also be measured to provide a compensation factor for the measured light intensities.Type: GrantFiled: November 1, 1991Date of Patent: February 9, 1993Assignee: Horiba, Ltd.Inventors: Tatsuo Igushi, Yoshiaki Togawa