Patents by Inventor Kenichi Ishiwa
Kenichi Ishiwa 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: 6838503Abstract: A resin composition useful for wire and cable covering material is formed by compounding a phosphate ester retardant, boron phosphate, and zinc borate hydrate with a polyphenylene ether group resin or a combination of a polyphenylene ether group resin and an aromatic vinyl group resin, in a specific ratio.Type: GrantFiled: June 28, 2002Date of Patent: January 4, 2005Assignee: General Electric CompaInventors: Ming Yin, Takuro Kitamura, Atsuo Oshiro, Kenichi Ishiwa, Kazunari Kosaka, Hiroshi Kubo
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Patent number: 6562433Abstract: The present invention provides a composition comprising polycarbonate wherein the polycarbonate has a very low Fries content (e.g., above 5 ppm and below 360 ppm). The present invention also provides a polycarbonate having a very low Fries content which is made by the melt process. This polycarbonate has high ductility and high impact strength. The invention also provides a method for making these compositions. Another aspect of the invention is an optical disk comprising polycarbonate having a very low Fries content which is made by the melt process. Such optical disks resist breakage due to bending.Type: GrantFiled: September 18, 2000Date of Patent: May 13, 2003Assignee: General Electric CompanyInventors: Hiromi Ishida, Kenichi Ishiwa, Mitsuyasu Okamura, Tomoaki Shimoda, Theodorus L. Hoeks, Henricus H. M. van Hout, Monica M. Marugan, Patrick J. McCloskey, Joseph A. King, Jr., Paul M. Smigelski, Jr.
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Publication number: 20030055138Abstract: A resin composition useful for wire and cable covering material is formed by compounding a phosphate ester retardant, boron phosphate, and zinc borate hydrate with a polyphenylene ether group resin or a combination of a polyphenylene ether group resin and an aromatic vinyl group resin, in a specific ratio.Type: ApplicationFiled: June 28, 2002Publication date: March 20, 2003Inventors: Ming Yin, Takuro Kitamura, Atsuo Oshiro, Kenichi Ishiwa, Kazunari Kosaka, Hiroshi Kubo
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Patent number: 6022942Abstract: There is provided herein an optical storage media which has low VBR. In a preferred embodiment, there is provided an optical disk comprising a genus of copolycarbonates, including copolyestercarbonates, which have excellent physical and optical properties. Said copolycarbonates have proportions of structural units which fall within a specific composition range, and said range defines certain materials, a large percentage of which can be molded into optical disks having the desired optical properties, including low VBR.Type: GrantFiled: January 5, 1999Date of Patent: February 8, 2000Assignee: General Electric CompanyInventors: Kenichi Ishiwa, Henricus H. M. van Hout, Ali Dhinojwala, Niles R. Rosenquist, Paul D. Sybert, Steven F. Hubbard, Paul C. Raymond, III, Joseph A. King, Jr., Gary C. Davis
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Patent number: 5973101Abstract: An aromatic polycarbonate resin composition having hydroxyl groups as end groups is thermally stable and also offers excellent resistance to hydrolysis. The polycarbonate resin composition incorporates (A) an aromatic polycarbonate resin containing hydroxyl groups in the proportion of 5% or more of the total end groups and a metal impurity and (B) a deactivating agent selected from the group consisting of phosphorous acid, a thioether compound, a phosphite diester and a nitrogen-containing organic compound. The amount of deactivating agent is based on the amount of metal impurity in (A) and the type of deactivating agent.Type: GrantFiled: September 25, 1998Date of Patent: October 26, 1999Assignee: General Electric CompanyInventors: Shoichi Toshida, Takashi Nagai, Kenichi Ishiwa
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Patent number: 5565515Abstract: Improved flow copolycarbonate compositions are provided containing resorcinol repeat units and containing styrene-acrylonitrile copolymers. The compositions may additionally comprise a rubbery polymer and an inorganic filler, such as glass fibers.Type: GrantFiled: January 11, 1996Date of Patent: October 15, 1996Assignee: General Electric CompanyInventors: Kenichi Ishiwa, Hideyuki Itoi
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Patent number: 5489655Abstract: Thermosetting resin compositions with low shrinkage are provided, which when molded show low shrinkage rates, good dimensional stability (little cracking or warping), and excellent surface smoothness, mechanical strength, and dispersion stability.The thermosetting resin compositions with low shrinkage in accordance with the present invention comprise:(a) 100 wt. parts by weight thermosetting resins, and(b) 3 to 200 parts by weight polycarbonates containing constituent units derived from aromatic dihydroxy compounds.The polycarbonates preferably have at least 5% (of all the terminal groups) terminal hydroxyl groups derived from aromatic dihydroxy compounds. The polycarbonates also preferably have an intrinsic viscosity of 0.05 to 0.65 dL/g.Type: GrantFiled: July 26, 1993Date of Patent: February 6, 1996Assignee: General Electric CompanyInventors: Tomoaki Shimoda, Kenichi Ishiwa
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Patent number: 5484874Abstract: Polycarbonate resin compositions and methods for their preparation are disclosed. The disclosed compositions are comprised of polycarbonate resins and esters of aliphatic carboxylic acids and alcohols and exhibit good mold release and thermal stability while experiencing little discoloration during molding.Type: GrantFiled: March 19, 1993Date of Patent: January 16, 1996Assignee: GE Plastics, Japan, Ltd.Inventors: Kenichi Ishiwa, Hideyuki Itoi
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Patent number: 5420192Abstract: A resin composition containing 99-50 parts by weight of (A), a copolymeric polycarbonate having the constituent units described by formulas (1) and (2), hereinbelow, and in which the constituent unit in formula (2) accounts for 2-90 mole percent of the constituent units (1) and (2) and 1-50 parts by weight of (B) glass fiber having a mean fiber diameter of less than 10 .mu.m. ##STR1## where each R.sup.4 and R.sup.5 is independently a halogen atom or a monovalent hydrocarbon radical; B is --(R.sup.1 --)C(--R.sup.2)-- where each R.sup.1 and R.sup.2 is independently a hydrogen atom or a monovalent hydrocarbon radical, --C(.dbd.R.sup.3)-- where R.sup.3 is a divalent hydrocarbon radical, --O--, --S--, --SO--, or --SO.sub.2 --; R.sup.6 is a hydrocarbon radical with 1-10 carbon atoms, a halide thereof, or a halogen atom; and each p, q, and n is independently an integer ranging from 0 to 4.Type: GrantFiled: October 5, 1994Date of Patent: May 30, 1995Assignee: General Electric CompanyInventors: Kenichi Ishiwa, Hideyuki Itoi
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Patent number: 5418269Abstract: Optical grade polycarbonate resin compositions and methods for their preparation are disclosed. The disclosed compositions are comprised of polycarbonate resins and esters of aliphatic carboxylic acids and alcohols and exhibit good mold release and thermal stability while experiencing little discoloration during molding.Type: GrantFiled: March 19, 1993Date of Patent: May 23, 1995Assignee: GE Plastics JapanInventors: Kenichi Ishiwa, Hideyuki Itoi
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Patent number: 5403878Abstract: Polycarbonate resin compositions suitable for optical uses and methods for their preparation are disclosed. The disclosed compositions are comprised of polycarbonate resins and .alpha.-olefin oligomers and exhibit good mold release and thermal stability while experiencing little discoloration or molecular weight reduction during molding.Type: GrantFiled: March 17, 1993Date of Patent: April 4, 1995Inventors: Kenichi Ishiwa, Hideyuki Itoi
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Patent number: 5389713Abstract: Polycarbonate resin compositions methods for their preparation are disclosed. The disclosed compositions are comprised of polycarbonate resins and .alpha.-olefin oligomers and exhibit good mold release and thermal stability while experiencing little discoloration or molecular weight reduction during molding.Type: GrantFiled: March 3, 1993Date of Patent: February 14, 1995Assignee: GE Plastics JapanInventors: Kenichi Ishiwa, Hideyuki Itoi