Patents by Inventor Chi-San Wu
Chi-San Wu 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: 6806334Abstract: What is described herein is an excipient for a pharmaceutical tablet which is a proliferous copolymer of vinyl pyrrolidone and vinyl acetate, to provide the tablet with rapid dissolution and disintegration properties, and, also reduced hygroscopicity.Type: GrantFiled: September 16, 2003Date of Patent: October 19, 2004Assignee: ISP Investments Inc.Inventors: Edward G. Malawer, James P. Cullen, Chi-San Wu, Laurence Senak, William J. Drefko, David K. Hood, Peter J. Brush
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Publication number: 20040121545Abstract: A new method is provided for the etch of polysilicon spacers that form part of split-gate flash memory devices. Under a first embodiment of the invention, a conventional polysilicon gate etch is augmented with an oxide based plasma treatment of the layer of polysilicon that is being etched as part of this etch.Type: ApplicationFiled: December 23, 2002Publication date: June 24, 2004Applicant: Taiwan Semiconductor Manufacturing CompanyInventors: Bi-Ling Chen, Hung-Cheng Sung, Chi-San Wu, Chia-Shiung Tsai, Hsiu Ouyang
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Publication number: 20040054066Abstract: What is described herein is an excipient for a pharmaceutical tablet which is a proliferous copolymer of vinyl pyrrolidone and vinyl acetate, to provide the tablet with rapid dissolution and disintegration properties, and, also reduced hygroscopicity.Type: ApplicationFiled: September 16, 2003Publication date: March 18, 2004Applicant: ISP INVESTMENTS INC.Inventors: Edward G. Malawer, James P. Cullen, Chi-San Wu, Laurence Senak, William J. Drefko, David K. Hood, Peter J. Brush
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Patent number: 6620900Abstract: What is described herein is a pharmaceutical excipient which is a proliferous copolymer of vinyl pyrrolidone and vinyl acetate, having advantageous dissolution and disintegration properties.Type: GrantFiled: February 7, 2002Date of Patent: September 16, 2003Assignee: ISP Investments Inc.Inventors: Edward G. Malawer, James P. Cullen, Chi-San Wu, Laurence Senak, William J. Drefko
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Publication number: 20030153705Abstract: What is described herein is a pharmaceutical excipient which is a proliferous copolymer of vinyl pyrrolidone and vinyl acetate, having advantageous dissolution and disintegration properties.Type: ApplicationFiled: February 7, 2002Publication date: August 14, 2003Applicant: ISP INVESTMENTS INC.Inventors: Edward G. Malawer, James P. Cullen, Chi-San Wu, Laurence Senak, William J. Drefko
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Patent number: 6418702Abstract: This invention concerns a stabilized packaging environment for a particulate vinyl lactam polymer, particularly polyvinylpyrrolidone particles, which comprises a sealed, oxygen-impervious receptacle containing the polymer particles and a separate air permeable package within the receptacle containing a water moistened oxygen scavenging agent, preferably iron powder, an iron (II) salt, ascorbic acid or a mixture of such agents.Type: GrantFiled: July 23, 2001Date of Patent: July 16, 2002Assignee: ISP Investments Inc.Inventors: Chi-San Wu, Laurence Senak, Donna Osborne, James F. Curry, Charles B. Schriver, Irwin B. Silverstein
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Publication number: 20020006522Abstract: This invention concerns a stabilized packaging environment for a particulate vinyl lactam polymer, particularly polyvinylpyrrolidone particles, which comprises a sealed, oxygen-impervious receptacle containing said polymer particles and a separate air permeable package within the receptacle containing a water moistened oxygen scavenging agent, preferably iron powder, an iron (II) salt, ascorbic acid or a mixture of such agents.Type: ApplicationFiled: July 23, 2001Publication date: January 17, 2002Applicant: ISP INVESTMENTS INC.Inventors: Chi-San Wu, Laurence Senak, Donna Osborne, James F. Curry, Charles B. Schriver, Irwin B. Silverstein
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Patent number: 6331333Abstract: This invention concerns a stabilized packaging environment for a particulate vinyl lactam polymer, particularly polyvinylpyrrolidone particles, which comprises a sealed, oxygen-impervious receptacle containing said polymer particles and a separate air permeable package within the receptacle containing a water moistened oxygen scavenging agent, preferably iron powder, an iron (II) salt, ascorbic acid or a mixture of such agents.Type: GrantFiled: September 16, 1998Date of Patent: December 18, 2001Assignee: ISP Investments Inc.Inventors: Chi-San Wu, Laurence Senak, Donna Osborne, James F. Curry, Charles B. Schriver, Irwin B. Silverstein
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Patent number: 6235621Abstract: A method for fabricating semiconductor device is disclosed herein. The first step is to form a first oxide layer on a substrate. Subsequently formed are polycrystalline silicon layer, a polycide layer, optionally a second oxide layer, and a silicon nitride layer on the first oxide layer. A photoresist pattern on the silicon layer is formed thereafter, and the silicon nitride layer is etched using the photoresist pattern as a mask to expose a portion of the polycide layer. The photoresist pattern is then, the polycide layer is isotropically etched to form an under cut in the polycide layer under the etched nitride layer (optional second oxide layer). The width of the top portion of the isotropically etched polycide layer is smaller than the width of the etched nitride layer. The isotropically etched polycide layer is then anistropically etched, and the polycrystalline layer is etched to expose a portion of the first oxide layer to form a multi-layer structure.Type: GrantFiled: November 22, 1999Date of Patent: May 22, 2001Assignee: Vanguard International Semiconductor CorporationInventors: Erik S. Jeng, Tzu-Shih Yen, Chi-San Wu, Jong-Bor Wang
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Patent number: 6191019Abstract: A method for preventing void formation in a gate of a transistor formed in a substrate is disclosed. The method comprises: forming a gate oxide layer on the substrate; forming a polysilicon layer on the gate oxide layer; performing an ion implantation on the polysilicon layer, the ion implantation performed with a power approximately 30 KeV and a dosage about more than 1015 atoms/cm2; and forming a silicide layer on the polysilicon layer.Type: GrantFiled: January 12, 1999Date of Patent: February 20, 2001Assignee: Vanguard International Semiconductor CorporationInventors: Chih-Cherng Liao, Jiunn-Liang Yu, Chan-Jen Kuo, Chi-San Wu, Yun-Chi Jiang
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Patent number: 5739183Abstract: A method of stabilizing an aqueous solution of an acid copolymer of maleic acid and a C.sub.1 -C.sub.5 alkyl vinyl ether against degradation in viscosity or molecular weight upon storage for an extended period of time in aqueous solution at ambient conditions, with a single stabilizing agent, which comprises forming the acid copolymer directly from a slurry of corresponding anhydride in an organic solvent by hydrolysis in water, and adding including ethylenediamine tetraacetic acid (EDTA), or salt thereof, as the single stabilizing agent to the solution either before or after hydrolysis.Type: GrantFiled: September 13, 1995Date of Patent: April 14, 1998Assignee: ISP Investments Inc.Inventors: Chi-San Wu, James Curry, James P. Cullen, John S. Mc Ewan
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Patent number: 5621136Abstract: A method of stabilizing an aqueous solution of an acid copolymer of maleic acid and a C.sub.1 -C.sub.5 alkyl vinyl ether against degradation in viscosity or molecular weight upon storage for an extended period of time in aqueous solution at ambient conditions, with a single stabilizing agent, which comprises forming the acid copolymer, preferably directly from a slurry of corresponding anhydride in an organic solvent by hydrolysis in water, and adding superoxide dismutase as the single stabilizing agent to the solution either before or after hydrolysis.Type: GrantFiled: October 13, 1995Date of Patent: April 15, 1997Assignee: ISP Investments Inc.Inventors: Chi-San Wu, James Curry, James P. Cullen, John S. McEwan
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Patent number: 5373074Abstract: A free radical solution process for making PVP polymers having a molecular weight corresponding to a K-value of about 30-150, a narrow molecular weight distribution represented by a polydispersity of about 3 to 6, and a residual VP monomer level of less than 0.1%, which comprises:(a) precharging a reaction mixture of vinylpyrrolidone monomer and water in a solids contents w/w VP/H.sub.2 O of about 5-50%, and a dual free radical initiator system which comprises both low and high decomposition temperature free radical initiators whose 10-hour half-life temperature decomposition constants differ from each other by more than 5.degree. C., the low and high temperature initiators being present, respectively, in an amount of about 0.05-0.5%, and about 0.1-0.Type: GrantFiled: February 12, 1993Date of Patent: December 13, 1994Assignee: ISP Investments Inc.Inventors: Chi-San Wu, James F. Curry, James P. Cullen
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Patent number: 5338814Abstract: A process for making polyvinylpyrrolidone (PVP) K-90 having a polydispersity of less than 6, preferably less than 5, and most preferably, less than 4, which comprises polymerizing vinylpyrrolidone monomer by free radical solution polymerization, in water, in the presence of polyethylene glycol (PEG) having a molecular weight of about 300 as a chain transfer agent. The product is an aqueous solution of 15-25% PVP K-90, preferably 20%, 15-30% PEG, preferably 25%, and 45-70% water, preferably 55%, by weight of the solution.Type: GrantFiled: April 21, 1993Date of Patent: August 16, 1994Assignee: ISP Investments Inc.Inventors: Chi-San Wu, James F. Curry, James P. Cullen
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Patent number: 5262171Abstract: A pharmaceutical tablet is provided herein having an effective dissolution rate. The tablet contains a pharmaceutically-active ingredient and a substantially linear, i.e. non-crosslinked K-30 to K-120 PVP as a binding agent. The PVP used herein is made by an initiated polymerization process in which vinyl pyrrolidone monomer is polymerized in the presence of an initiator which produces a linear PVP polymerization, i.e. is a poor hydrogen abstractor of PVP polymer backbones, which would produce a disadvantageous crosslinked PVP product. Suitable initiators include low energy peroxyester free radical initiators, such as t-amylperoxy pivalate, an azo initiator, or a redox initiator which can perform at low temperatures.Preferably the residual initiator level in the PVP is reduced to less than 500 ppm, thereby further precluding the possibility of crosslinking of the PVP polymer during the shelf-life of the tablet.Type: GrantFiled: November 25, 1991Date of Patent: November 16, 1993Assignee: ISP Investments Inc.Inventors: Robert B. Login, Mohammed Tazi, Jui-Chang Chuang, Rama K. Haldar, Dinesh Jaiswal, Chi-San Wu