Patents by Inventor Wie-Hin Pan
Wie-Hin Pan 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: 20100043135Abstract: An example adjustable showerhead assembly includes a shroud and a showerhead movable between a first position attached to the shroud and a second position detached from the shroud. A flexible conduit communicates fluid to the showerhead. The shroud contains the flexible conduit when the showerhead is in the first position.Type: ApplicationFiled: August 21, 2008Publication date: February 25, 2010Inventors: Charles A. Patterson, Wie-Hin Pan, Julian Giggs, Victor Hoernig, Philip Nathan, Michael A. Miller
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Patent number: 6469072Abstract: A method for dispersing solid forms of additives in polymers involves adding dispersions or solutions of additive(s) to a solution of polymer in a tubular mixer (preferably in the presence of a stationary mixer). The mixer leads to a steam precipitation step wherein all fluid ingredients in the mixture are volatilized leaving the solid additive and resin in the desired ratio. This results in a uniform dispersion of the additives in the polymer matrix. As a result of the high dispersion, physical properties of a thermoplastic resin, to which the polymer matrix has been added are preserved. In one illustration, PTFE as a drip inhibitor additive, is added to polycarbonate to obtain a highly dispersed PTFE concentrate of improved-drip-inhibition without loss of mechanical properties when added to a thermoplastic molding resin.Type: GrantFiled: September 1, 2000Date of Patent: October 22, 2002Assignee: General Electric CompanyInventors: Qamar S. Bhatia, Paul Buckley, Gary Davis, Robert L. Howe, Wie-Hin Pan, Elliott Shanklin
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Patent number: 6160038Abstract: A method for dispersing solid forms of additives in polymers involves adding dispersions or solutions of additive(s) to a solution of polymer in a tubular mixer (preferably in the presence of a stationary mixer). The mixer leads to a steam precipitation step wherein all fluid ingredients in the mixture are volatilized leaving the solid additive and resin in the desired ratio. This results in a uniform dispersion of the additives in the polymer matrix. As a result of the high dispersion, physical properties of a thermoplastic resin, to which the polymer matrix has been added are preserved. In one illustration, PTFE as a drip inhibitor additive, is added to polycarbonate to obtain a highly dispersed PTFE concentrate of improved drip-inhibition without loss of mechanical properties when added to a thermoplastic molding resin.Type: GrantFiled: September 27, 1999Date of Patent: December 12, 2000Assignee: General Electric CompanyInventors: Qamar S. Bhatia, Paul Buckley, Gary Davis, Robert L. Howe, Wie-Hin Pan, Elliott Shanklin
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Patent number: 6103827Abstract: A thermoplastic resin composition having improved transparency and containing polycarbonate resin and/or polyester carbonate resin and acrylic resin and/or methacrylic resin comprisesA) (a) polycarbonate resin and/or (b) polyester carbonate resin andB) acrylic resin and/or methacrylic resin, having 0.000005-0.5 parts by weight of C) a basic compound catalyst and/or acidic compound catalyst added with respect to a total of 100 parts by weight of the aforementioned components A) and B).Type: GrantFiled: November 13, 1998Date of Patent: August 15, 2000Assignee: General Electric CompanyInventors: Akihiro Saito, Takashi Nagai, Takuro Kitamura, Wie-Hin Pan, Patrick McCloskey
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Patent number: 6005025Abstract: A method for dispersing solid forms of additives in polymers involves adding dispersions or solutions of additive(s) to a solution of polymer in a tubular mixer (preferably in the presence of a stationary mixer). The mixer leads to a steam precipitation step wherein all fluid ingredients in the mixture are volatilized leaving the solid additive and resin in the desired ratio. This results in a uniform dispersion of the additives in the polymer matrix. As a result of the high dispersion, physical properties of a thermoplastic resin, to which the polymer matrix has been added are preserved. In one illustration, PTFE as a drip inhibitor additive, is added to polycarbonate to obtain a highly dispersed PTFE concentrate of improved drip-inhibition without loss of mechanical properties when added to a thermoplastic molding resin.Type: GrantFiled: January 5, 1998Date of Patent: December 21, 1999Assignee: General Electric CompanyInventors: Qamar S. Bhatia, Paul Buckley, Gary Davis, Robert L. Howe, Wie-Hin Pan, Elliott Shanklin
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Patent number: 5883194Abstract: A thermoplastic resin composition having improved transparency and containing polycarbonate resin and/or polyester carbonate resin and acrylic resin and/or methacrylic resin comprisesA) (a) polycarbonate resin and/or (b) polyester carbonate resin andB) acrylic resin and/or methacrylic resin, having 0.000005-0.5 parts by weight of C) a basic compound catalyst and/or acidic compound catalyst added with respect to a total of 100 parts by weight of the aforementioned components A) and B).Type: GrantFiled: July 24, 1997Date of Patent: March 16, 1999Assignee: General Electric CompanyInventors: Akihiro Saito, Takashi Nagai, Takuro Kitamura, Wie-Hin Pan, Patrick McCloskey
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Patent number: 5777009Abstract: A polyestercarbonate copolymer blend which exhibits a glass transition temperature lower than bisphenol-A carbonate homopolymer, shows improved processability and fire-retardancy. The desired lower Tg and improved flow can be achieved by the polycondensation of a dihydric phenol and aliphatic dicarboxylic acid. The condensate is polymerized with a carbonate forming reagent. The resin is fire-retarded with a mixture of halogenated polycarbonate, potassium diphenylsulfone sulfonate and polytetrafluoroethylene.Type: GrantFiled: October 25, 1996Date of Patent: July 7, 1998Assignee: General Electric CompanyInventors: Wie-Hin Pan, Dwight J. Patterson, Omar M. Boutni, Luca P. Fontana
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Patent number: 5773493Abstract: A method for dispersing solid forms of additives in polymers involves adding dispersions or solutions of additive(s) to a solution of polymer in a tubular mixer (preferably in the presence of a stationary mixer). The mixer leads to a steam precipitation step wherein all fluid ingredients in the mixture are volatilized leaving the solid additive and resin in the desired ratio. This results in a uniform dispersion of the additives in the polymer matrix. As a result of the high dispersion, physical properties of a thermoplastic resin, to which the polymer matrix has been added are preserved. In one illustration, PTFE as a drip inhibitor additive, is added to polycarbonate to obtain a highly dispersed PTFE concentrate of improved drip-inhibition without loss of mechanical properties when added to a thermoplastic molding resin.Type: GrantFiled: March 1, 1996Date of Patent: June 30, 1998Assignee: General Electric CompanyInventors: Qamar S. Bhatia, Paul Buckley, Gary Davis, Robert L. Howe, Wie-Hin Pan, Elliott Shanklin
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Patent number: 5521230Abstract: A method for dispersing solid forms of additives in polymers involves adding dispersions or solutions of additive(s) to a solution of polymer in a tubular mixer (preferably in the presence of a stationary mixer). The mixer leads to a steam precipitation step wherein all fluid ingredients in the mixture are volatilized leaving the solid additive and resin in the desired ratio. This results in a uniform dispersion of the additives in the polymer matrix. As a result of the high dispersion, physical properties of a thermoplastic resin, to which the polymer matrix has been added are preserved. In one illustration, PTFE as a drip inhibitor additive, is added to polycarbonate to obtain a highly dispersed PTFE concentrate of improved drip-inhibition without loss of mechanical properties when added to a thermoplastic molding resin.Type: GrantFiled: April 3, 1995Date of Patent: May 28, 1996Assignee: General Electric CompanyInventors: Qamar S. Bhatia, Paul Buckley, Gary Davis, Robert L. Howe, Wie-Hin Pan, Elliott Shanklin
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Patent number: 5274017Abstract: Aromatic carbonate polymers are flame retarded by an effective amount of a metal oxide of aluminum, magnesium, lithium, lanthanum, bismuth or yttrium. Colloidal aluminum oxide on silica is particularly effective.Type: GrantFiled: November 24, 1989Date of Patent: December 28, 1993Assignee: General Electric CompanyInventor: Wie-Hin Pan
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Patent number: 5137855Abstract: Catalysts for the selective catalytic reduction of NOx by ammonia are made from porous formed supports having a certain fraction of the pores with pore diameters larger than 600 Angstrom units. Thus macropores can be introduced in a formed TiO.sub.2 support by adding burnout materials prior to forming the titania into the formed support. Then conventional DeNOx catalytic metals are added. Barium sulfate can be added to the surface of the porous inorganic oxide to make an improved support.Type: GrantFiled: September 21, 1989Date of Patent: August 11, 1992Assignee: W. R. Grace & Co.-Conn.Inventors: Louis Hegedus, Jean W. Beeckman, Wie-Hin Pan, Jeffrey P. Solar
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Patent number: 5102696Abstract: Fluoropolymers in the form of solid particles of specified diameter and dispersed in water are added and mixed with polycarbonate resin particles at a rate of 0.1 to 9 liter/hour to obtain a uniform coating of the fluoropolymer on the polycarbonate resin particles. The proportion of fluoropolymer added is from 0.01 to about 70 parts for each 100 parts by weight of polycarbonates and mixing is carried out to continually bring polycarbonate resin particles (non-contacted) into contact with the fluoropolymer dispension as it is added.Type: GrantFiled: March 27, 1990Date of Patent: April 7, 1992Assignee: General Electric CompanyInventors: Wie-Hin Pan, Randall A. Reed
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Patent number: 5023067Abstract: An extremely pure oxide containing two or more metals, homogeneous at the atomic level, is prepared by (1) reacting in water, soluble salts of two or more metals with quaternary ammonium carbonate; the metals being those that form water-insoluble carbonates, thereby to precipitate mixed carbonates of the metals; (2) recovering and drying the precipitate; (3) calcining the precipitate to provide an oxide of mixed metals homogeneous at the atomic level and substantially free from extraneous contaminants. The calcined oxide can be shaped and compressed as greenware and sintered to form useful ceramic products.Type: GrantFiled: August 26, 1988Date of Patent: June 11, 1991Assignee: W. R. Grace & Co.-Conn.Inventors: Nicholas D. Spencer, Wie-Hin Pan, John A. Rudesill
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Patent number: 4975256Abstract: Catalysts for the selective catalytic reduction of NOx by ammonia are made from porous formed supports having a certain fraction of the pores with pore diameters larger than 600 Angstrom units. Thus macropores can be introduced in a formed TiO.sub.2 support by adding burnout materials or some inorganic oxide prior to forming the titania into the formed support. Alternatively, titania is precipitated onto a porous inorganic oxide such as SiO.sub.2, Al.sub.2 O.sub.3, ZrO.sub.2, AlPO.sub.4, Fe.sub.2 O.sub.3 and B.sub.2 O.sub.3 to form the support. Then conventional DeNOx catalytic metals are added. The support can be made by first impregnating the inorganic oxide particles with titania via a soluble precursor, forming titania and then shaping the coated particles into the desired shape such as a monolith. In a second embodiment, the inorganic oxide particles are first formed into the desired shape and then impregnated with the titania forming material.Type: GrantFiled: October 4, 1989Date of Patent: December 4, 1990Assignee: W. R. Grace & Co.-Conn.Inventors: Louis Hegedus, Jean W. Beeckman, Wie-Hin Pan, Jeffrey P. Solar
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Patent number: 4929586Abstract: Catalysts for the selective catalytic reduction of NOx by ammonia are made from porous formed supports having a certain fraction of the pores with pore diameters larger than 600 Angstrom units. Thus macropores can be introduced in a formed TiO.sub.2 support by adding burnout materials or some inorganic oxide prior to forming the titania into the formed support. Alternatively, titania is precipitated onto a porous inorganic oxide such as SiO.sub.2, Al.sub.2 O.sub.3, ZrO.sub.2, AlPO.sub.4, Fe.sub.2 O.sub.3 and B.sub.2 O.sub.3 to form the support. Then conventional DeNOx catalytic metals are added. The support can be made by first impregnating the inorganic oxide particles with titania via a soluble precursor, forming titania and then shaping the coated particles into the desired shape such as a monolith. In a second embodiment, the inorganic oxide particles are first formed into the desired shape and then impregnated with the titania forming material.Type: GrantFiled: June 9, 1988Date of Patent: May 29, 1990Assignee: W. R. Grace & Co.-Conn.Inventors: Louis Hegedus, Jean W. Beeckman, Wie-Hin Pan, Jeffrey P. Solar
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Patent number: 4588829Abstract: This invention relates to (disulfido)tris(N,N-substituted dithiocarbamato)Mo(V) complexes. More particularly, this invention relates to compounds of the formula MoS.sub.2 (S.sub.2 CNR.sub.2).sub.3 which are mononuclear, eight-coordinate, neutral Mo(V) complexes containing only eight sulfur atoms in the Mo coordination sphere. R is hydrogen, an alkyl, aryl, cycloalkyl group or mixture thereof. Preferably all of the R's are the same and are alkyl groups. These compounds are useful as lubricant additives.Type: GrantFiled: July 27, 1984Date of Patent: May 13, 1986Assignee: Exxon Research & Engineering CompanyInventors: Wie-Hin Pan, Edward I. Stiefel
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Patent number: 4585882Abstract: This invention relates to sulfido(disulfido)bis(N,N-substituted dithiocarbamato)W(VI) complexes, their preparation and use. More particularly, this invention relates to compounds of the formula WS(S.sub.2) (S.sub.2 CNR.sub.2).sub.2 which are mononuclear, seven-coordinate, neutral W(VI) complexes containing only seven sulfur atoms in the Mo coordination sphere. R is hydrogen, an alkyl, aryl, cycloalkyl group or mixture thereof. Preferably all of the R's are the same and are alkyl groups. These compounds are useful as catalysts or catalyst precursors for removing sulfur from sulfur containing hydrocarbons.Type: GrantFiled: July 27, 1984Date of Patent: April 29, 1986Assignee: Exxon Research and Engineering Co.Inventors: Edward I. Stiefel, Wie-Hin Pan, Thomas R. Halbert
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Patent number: 4581125Abstract: Hydrocarbon feeds are upgraded by contacting same, at elevated temperature and in the presence of hydrogen, with a self-promoted catalyst formed by heating one or more carbon-containing, bis(tetrathiometallate) catalyst precursor salts selected from the group consisting of (NR.sub.4).sub.2 [M(WS.sub.4).sub.2 ], (NR.sub.4).sub.x [M(MoS.sub.4).sub.2 ] and mixtures thereof wherein R is one or more alkyl groups, aryl groups or mixture thereof, wherein promoter metal M is covalently bound in the anion and is Ni, Co or Fe and wherein x is 2 if M is Ni and x is 3 if M is Co or Fe composite in a non-oxidizing atmosphere in the presence of sulfur, hydrogen, and a hydrocarbon to form said supported catalyst.Type: GrantFiled: July 29, 1983Date of Patent: April 8, 1986Assignee: Exxon Research and Engineering Co.Inventors: Edward I. Stiefel, Wie-Hin Pan, Russell R. Chianelli, Teh C. Ho
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Patent number: 4547321Abstract: Compositions of the formula [(Cat.sup.n)].sub.3/n [Co(MoS.sub.4).sub.2 ] wherein Cat is a mono, di or trivalent cation and n is 1, 2 or 3, respectively, have been prepared in non-aqueous media. The [Co(MoS.sub.4).sub.2 ].sup.3- anion has the general structure ##STR1## Cat is preferably an alkyl substituted quaternary ammonium compound.Type: GrantFiled: July 29, 1983Date of Patent: October 15, 1985Assignee: Exxon Research and Engineering Co.Inventors: Edward I. Stiefel, Wie-Hin Pan, Stephen McKenna
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Patent number: 4514517Abstract: Hydrocarbon feeds are upgraded by contacting a feed, at an elevated temperature and in the presence of hydrogen, with a supported, self-promoted catalyst formed by compositing a porous, refractory inorganic oxide, support with one or more complex salts selected from the group consisting of (NR.sub.4).sub.2 [M(WS.sub.4).sub.2 ], (NR.sub.4).sub.x [M(MoS.sub.4).sub.2 ] and mixtures thereof wherein R is one or more alkyl groups, aryl groups or mixture thereof, wherein promoter metal M is covalently bound in the anion and is Ni, Co or Fe and wherein x is 2 if M is Ni and x is 3 if M is Co or Fe and heating said composite in a non-oxidizing atmosphere in the presence of sulfur and hydrogen and a hydrocarbon to form said supported catalyst.Type: GrantFiled: July 29, 1983Date of Patent: April 30, 1985Assignee: Exxon Research and Engineering Co.Inventors: Teh C. Ho, Wie-Hin Pan