Patents by Inventor Changzai Chi
Changzai Chi 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).
-
Publication number: 20240124731Abstract: The present disclosure pertains an aqueous inkjet ink having self-dispersing pigment or pigment dispersed by polyurethane or acrylic dispersant polymer with alkaline neutralized carboxyl functional group, polyurethane or acrylic binder particles, and less than 3 wt % of surface modified silanized colloid silica particles with particle size smaller than 30 nm as an additive.Type: ApplicationFiled: September 18, 2023Publication date: April 18, 2024Inventors: XIAOQING LI, CHANGZAI CHI, JI YEON HUH
-
Publication number: 20220356065Abstract: Modified silanized colloidal silica particles are reaction products of silanized colloidal silica particles having epoxy moieties with a nitrogen of an amino group of an amino acid to form stable modified silanized colloidal silica particles. The modified silanized colloidal silica particles can be used as an abrasive in chemical mechanical polishing of various substrates.Type: ApplicationFiled: March 17, 2022Publication date: November 10, 2022Inventors: Changzai Chi, Murali Ganth Theivanayagam, Kwadwo Tettey
-
Publication number: 20220348790Abstract: Chemical mechanical polishing compositions include modified silanized colloidal silica particles which are reaction products of silanized colloidal silica particles having epoxy moieties with nitrogen of amines to form stable and tunable modified silanized colloidal silica particles. The modified silanized colloidal silica particles can be used as an abrasive in chemical mechanical polishing of various substrates to polish metal such as copper, Ta and TaN and dielectrics such as TEOS and low-K film.Type: ApplicationFiled: March 17, 2022Publication date: November 3, 2022Inventors: Changzai Chi, Kwadwo Tettey, Matthew Richard Van Hanehem, Murali Ganth Theivanayagam, Li Zhang, David Wayne Mosley
-
Publication number: 20220348789Abstract: Modified silanized colloidal silica particles are reaction products of silanized colloidal silica particles having epoxy moieties with nitrogen of amines to form stable and tunable modified silanized colloidal silica particles. The modified silanized colloidal silica particles can be used as an abrasive in chemical mechanical polishing of various substrates.Type: ApplicationFiled: March 17, 2022Publication date: November 3, 2022Inventor: Changzai CHI
-
Publication number: 20140336295Abstract: A porous body consists essentially of a plurality of ceramic particles having an average size ranging from 8 to 100 nm. The ceramic particles are bonded to adjacent ceramic particles with a strength sufficient to render the porous body self-supporting. The porosity ranges from 30 to 70 vol. % and the average pore size ranges from 5 to 50 nm. The porous body may be manufactured by preparing a dispersion comprising the ceramic particles and a polymer matrix material in a solvent, removing the solvent by heating and/or evaporation, forming a preform of the dried material, and firing the preform to remove the polymer matrix material and bond the ceramic particles to each other. The porous body is useful as a filter element in a system adapted to remove nanoscale particles from a fluid stream.Type: ApplicationFiled: May 9, 2013Publication date: November 13, 2014Applicant: E I DU PONT DE NEMOURS AND COMPANYInventors: CHANGZAI CHI, JEFFREY SCOTT METH
-
Patent number: 8858833Abstract: The invention is directed to a process of combining an aqueous solution of a fluoride with an aqueous solution of a host multi-valent metal salt and an aqueous solution of a salt forming a reactant mixture resulting in a precipitate of aqueously insoluble rare-earth doped multi-valent metal fluoride nanoparticles.Type: GrantFiled: May 31, 2006Date of Patent: October 14, 2014Assignee: E I du Pont de Nemours and CompanyInventors: Changzai Chi, Daniel Albert Green, Kurt Richard Mikeska, Lee A. Silverman
-
Publication number: 20130344338Abstract: This invention relates to processes in which certain aminosilanes are used to surface-modify colloidal silica nanoparticles, while reducing or virtually eliminating the propensity of the silica nanoparticles to gel, agglomerate, or aggregate. The surface-modified colloidal silica nanoparticles can be readily dispersed in polymers to provide nanocomposites with one or more enhanced, desirable properties.Type: ApplicationFiled: June 30, 2011Publication date: December 26, 2013Applicant: E.I. Du Pont de Nemours and CompanyInventors: Paul Gregory Bekiarian, Changzai Chi, Gordon Mark Cohen
-
Patent number: 8450513Abstract: Novel silane compositions have been prepared by reacting a 3-isocyanatopropyl trialkoxysilane with an alcohol or diol having a divalent alkylene or alkylene-ether group. The alcohol or diol has a formula weight less than about 5000. The compositions can be used to modify the surfaces of inorganic oxygen-containing materials, including but not limited to silica, silicates, borosilicates, aluminosilicates, days, and metal oxides. Surface treatment of silica nanoparticles with these compositions improves their improved dispersion in polyester nanocomposites.Type: GrantFiled: July 30, 2010Date of Patent: May 28, 2013Assignee: E I du Pont de Nemours and CompanyInventors: Changzai Chi, Gordon Mark Cohen, Surbhi Mahajan, Anilkumar Raghavanpillai
-
Patent number: 8383716Abstract: Polyester nanocomposite compositions contain silica nanoparticles that have been subjected to surface treatment with novel trialkoxysilane compositions. The novel silane compositions are prepared by reacting a 3-isocyanatopropyl trialkoxysilane with 1,3-propanediol or certain polyether diols. The silica nanoparticles exhibit improved dispersion in the polyester. This leads to haze reduction and improvements in mechanical properties.Type: GrantFiled: July 30, 2010Date of Patent: February 26, 2013Assignee: E I du Pont de Nemours and CompanyInventors: Changzai Chi, Gordon Mark Cohen, Surbhi Mahajan, Anilkumar Raghavanpillai
-
Publication number: 20120029222Abstract: Silica nanoparticles that have been subjected to surface treatment with novel silane compositions exhibit improved dispersion in polyester nanocomposites. The novel silane compositions are prepared by reacting a 3-isocyanatopropyl trialkoxysilane with an alcohol or diol having a divalent alkylene or alkylene-ether group, where the alcohol or diol has a formula weight less than about 5000. The surface treatment of the nanoparticles leads to improvements in mechanical properties and haze reduction in polyester nanocomposites containing them.Type: ApplicationFiled: July 30, 2010Publication date: February 2, 2012Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: CHANGZAI CHI, Gordon Mark Cohen, Surbhi Mahajan, Anilkumar Raghavanpillai
-
Publication number: 20120029148Abstract: Polyester nanocomposite compositions contain silica nanoparticles that have been subjected to surface treatment with novel trialkoxysilane compositions. The novel silane compositions are prepared by reacting a 3-isocyanatopropyl trialkoxysilane with 1,3-propanediol or certain polyether diols. The silica nanoparticles exhibit improved dispersion in the polyester. This leads to haze reduction and improvements in mechanical properties.Type: ApplicationFiled: July 30, 2010Publication date: February 2, 2012Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: CHANGZAI CHI, Gordon Mark Cohen, Surbhi Mahajan, Anilkumar Raghavanpillai
-
Publication number: 20120029221Abstract: Novel silane compositions have been prepared by reacting a 3-isocyanatopropyl trialkoxysilane with an alcohol or diol having a divalent alkylene or alkylene-ether group. The alcohol or diol has a formula weight less than about 5000. The compositions can be used to modify the surfaces of inorganic oxygen-containing materials, including but not limited to silica, silicates, borosilicates, aluminosilicates, days, and metal oxides. Surface treatment of silica nanoparticles with these compositions improves their improved dispersion in polyester nanocomposites.Type: ApplicationFiled: July 30, 2010Publication date: February 2, 2012Applicant: E.I. DU PONT DE NEMOURS AND COMPANYInventors: CHANGZAI CHI, Gordon Mark Cohen, Surbhi Mahajan, Anilkumar Raghavanpillai
-
Publication number: 20100019200Abstract: A method wherein an aqueous solution of a fluoride, an aqueous solution of a Group 2 or Group 3 metal salt, and an aqueous solution of a rare-earth metal dopant are combined in a plurality of continuous feed streams to form a series of precipitates of a rare-earth doped Group 2 or Group 3 metal fluoride, and wherein the member of the series differ by the concentration of the associated rare-earth dopant cation in the feed stream, and wherein the series so prepared defines the threshold concentration range above which operation of the process results in a minimization of the particle size variability caused by small perturbations in the concentration of the rare-earth dopant.Type: ApplicationFiled: August 3, 2009Publication date: January 28, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: CHANGZAI CHI, DANIEL ALBERT GREEN, KURT RICHARD MIKESKA, PAUL GREGORY BEKIARIAN
-
Publication number: 20100012898Abstract: A method wherein an aqueous solution of a fluoride, an aqueous solution of a Group 2 or Group 3 metal salt, and an aqueous solution of a rare-earth metal dopant are combined to form a precipitate of a rare-earth doped Group 2 or Group 3 metal fluoride, and wherein increasing the concentration of the rare-earth dopant cation increases the resulting particle size, and wherein decreasing the concentration of the rare-earth dopant cation decreases the particle size.Type: ApplicationFiled: August 3, 2009Publication date: January 21, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: CHANGZAI CHI, DANIEL ALBERT GREEN, KURT RICHARD MIKESKA, PAUL GREGORY BEKIARIAN
-
Patent number: 7625503Abstract: The invention is directed a composition represented by the chemical formula EuxA1?xF2+x?2yOy wherein A is alkaline earth, 0.002?x?0.20, and 0?y?x; the composition exhibiting a luminescence spectrum characterized by peaks at 592±2 nm and 627±2 nm, wherein the ratio of the peak intensity at 592±2 nm to that at 627±2 nm is at least 5% larger than the corresponding peak intensity ratio at the same wavelengths of a first corresponding reference composition with the same value of x that has not been exposed to a temperature above 100° C., and wherein said ratio of the peak intensity at 592±2 nm to that at 627±2 nm is at least 5% smaller than the corresponding peak intensity ratio at the same wavelengths of a second corresponding reference composition with the same value of x that has been subject to heating to 900° C. for 6 hours.Type: GrantFiled: May 17, 2007Date of Patent: December 1, 2009Assignee: E.I. du Pont de Nemours and CompanyInventors: Changzai Chi, Michael Karl Crawford, Kurt Richard Mikeska
-
Publication number: 20080025896Abstract: The invention is directed a composition represented by the chemical formula EuxA1?xF2+x?2yOy wherein A is alkaline earth, 0.002?x?0.20, and 0?y?x; the composition exhibiting a luminescence spectrum characterized by peaks at 592±2 nm and 627±2 nm, wherein the ratio of the peak intensity at 592±2 nm to that at 627±2 nm is at least 5% larger than the corresponding peak intensity ratio at the same wavelengths of a first corresponding reference composition with the same value of x that has not been exposed to a temperature above 100° C., and wherein said ratio of the peak intensity at 592±2 nm to that at 627±2 nm is at least 5% smaller than the corresponding peak intensity ratio at the same wavelengths of a second corresponding reference composition with the same value of x that has been subject to heating to 900° C. for 6 hours.Type: ApplicationFiled: May 17, 2007Publication date: January 31, 2008Inventors: CHANGZAI CHI, MICHAEL KARL CRAWFORD, KURT RICHARD MIKESKA
-
Publication number: 20070108413Abstract: The invention is directed to a process of combining an aqueous solution of a fluoride with an aqueous solution of a host multi-valent metal salt and an aqueous solution of a salt forming a reactant mixture resulting in a precipitate of aqueously insoluble rare-earth doped multi-valent metal fluoride nanoparticles.Type: ApplicationFiled: May 31, 2006Publication date: May 17, 2007Inventors: Changzai Chi, Daniel Green, Kurt Mikeska, Lee Silverman
-
Publication number: 20070022839Abstract: The present invention relates to syntheses of nano-sized iron particles formed by mixing a source of ferrous iron with a combination of reducing agent and base, and the particles formed therefrom.Type: ApplicationFiled: July 19, 2006Publication date: February 1, 2007Inventor: Changzai Chi
-
Publication number: 20060273285Abstract: A method wherein an aqueous solution of a fluoride, an aqueous solution of a host multi-valent metal salt and, optionally, an aqueous solution of a rare-earth metal dopant form a precipitate and wherein increasing the concentration of at least one of the group selected from the aqueous solution of the fluoride or the host multi-valent metal salt within the concentration range achieves smaller particles; or wherein decreasing the concentration of at least one of the group selected from the aqueous solution of the fluoride or the host multi-valent metal salt within the concentration range achieves larger particles.Type: ApplicationFiled: June 2, 2006Publication date: December 7, 2006Inventors: Changzai Chi, Daniel Green, Kurt Mikeska