Patents by Inventor David Y. Chung

David Y. Chung 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: 20240147243
    Abstract: An embodiment includes a method to increase the efficiency of security checkpoint operations. A security checkpoint kiosk serves as a Relying Party System (RPS). The RPS establishes a secure local connection between the RPS and a User Mobile-Identification-Credential Device (UMD). The RPS sends a user information request to the UMD, via the secure local connection, seeking release of user information associated with a Mobile Identification Credential (MIC). The RPS obtains authentication of the user information received in response to the user information request. The RPS retrieves user travel information based on the user information. The RPS determines that the user travel information matches the user information. When the user travel information matches the user information, the RPS approves the user to proceed past the security checkpoint kiosk.
    Type: Application
    Filed: January 4, 2024
    Publication date: May 2, 2024
    Inventors: Haya Iris VILLANUEVA GAVIOLA, Gianpaolo FASOLI, Vinay GANESH, Irene M. GRAFF, Martijn Theo HARING, Ahmer A. KHAN, Franck Farian RAKOTOMALALA, Gordon Y. SCOTT, Ho Cheung CHUNG, Antonio ALLEN, Mayura Dhananjaya DESHPANDE, Thomas John MILLER, Christopher SHARP, David W. SILVER, Policarpo B. WOOD, Ka YANG
  • Patent number: 11950101
    Abstract: An embodiment includes a method to increase the efficiency of security checkpoint operations. A security checkpoint kiosk serves as a Relying Party System (RPS). The RPS establishes a secure local connection between the RPS and a User Mobile-Identification-Credential Device (UMD). The RPS sends a user information request to the UMD, via the secure local connection, seeking release of user information associated with a Mobile Identification Credential (MIC). The RPS obtains authentication of the user information received in response to the user information request. The RPS retrieves user travel information based on the user information. The RPS determines that the user travel information matches the user information. When the user travel information matches the user information, the RPS approves the user to proceed past the security checkpoint kiosk.
    Type: Grant
    Filed: August 10, 2021
    Date of Patent: April 2, 2024
    Assignee: Apple Inc.
    Inventors: Haya Iris Villanueva Gaviola, Gianpaolo Fasoli, Vinay Ganesh, Irene M. Graff, Martijn Theo Haring, Ahmer A. Khan, Franck Farian Rakotomalala, Gordon Y. Scott, Ho Cheung Chung, Antonio Allen, Mayura Dhananjaya Deshpande, Thomas John Miller, Christopher Sharp, David W. Silver, Policarpo B. Wood, Ka Yang
  • Patent number: 8178465
    Abstract: The disclosure provides for a process and polymerization system to produce isoolefin polymers (72) utilizing polymorphogenates (16, 26) in the catalyst system to control polydispersity (MWD). The disclosure also provides a catalyst system (20) comprising a plurality of active catalyst complex species (34) formed by combination of a Lewis acid (24), an initiator (22) and a polymorphogenate (26), as well as polymers made using the catalyst system or process. The polymorphogenate (16, 26) can promote or mimic the formation of different active catalyst complex species (34) having different polymerization rates, i.e. different rates of propagation, chain transfer, or termination, as observed by different polydispersities resulting from the presence of relatively different proportions of the polymorphogenate.
    Type: Grant
    Filed: January 12, 2011
    Date of Patent: May 15, 2012
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Timothy D. Shaffer, Michael F. McDonald, David Y. Chung, Robert N. Webb, Deborah J. Davis, Pamela J. Wright
  • Publication number: 20110111950
    Abstract: The disclosure provides for a process and polymerization system to produce isoolefin polymers (72) utilizing polymorphogenates (16, 26) in the catalyst system to control polydispersity (MWD). The disclosure also provides a catalyst system (20) comprising a plurality of active catalyst complex species (34) formed by combination of a Lewis acid (24), an initiator (22) and a polymorphogenate (26), as well as polymers made using the catalyst system or process. The polymorphogenate (16, 26) can promote or mimic the formation of different active catalyst complex species (34) having different polymerization rates, i.e. different rates of propagation, chain transfer, or termination, as observed by different polydispersities resulting from the presence of relatively different proportions of the polymorphogenate.
    Type: Application
    Filed: January 12, 2011
    Publication date: May 12, 2011
    Inventors: Timothy D. Shaffer, Michael F. McDonald, David Y. Chung, Robert N. Webb, Deborah J. Davis, Pamela J. Wright
  • Patent number: 7893176
    Abstract: The disclosure provides for a process and polymerization system to produce isoolefin polymers (72) utilizing polymorphogenates (16, 26) in the catalyst system to control polydispersity (MWD). The disclosure also provides a catalyst system (20) comprising a plurality of active catalyst complex species (34) formed by combination of a Lewis acid (24), an initiator (22) and a polymorphogenate (26), as well as polymers made using the catalyst system or process. The polymorphogenate (16, 26) can promote or mimic the formation of different active catalyst complex species (34) having different polymerization rates, i.e. different rates of propagation, chain transfer, or termination, as observed by different polydispersities resulting from the presence of relatively different proportions of the polymorphogenate.
    Type: Grant
    Filed: March 23, 2007
    Date of Patent: February 22, 2011
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Timothy D. Shaffer, Michael F. McDonald, David Y. Chung, Robert N. Webb, Deborah J. Davis, Pamela J. Wright
  • Patent number: 7767743
    Abstract: A branched isobutylene-styrenic elastomer with a broad molecular weight distribution is disclosed comprising an interpolymer of an isoolefin monomer as isobutylene, a styrenic monomer such as p-methylstyrene, and a multiolefin such as divinylbenzene. The elastomer has improved green strength, relaxation characteristics, and processability in melt processing, while retaining excellent aging characteristics and barrier properties, and can be used in a blend with a linear isobutylene-p-alkylstyrene elastomer to improve processability of the linear elastomer. Also disclosed are a method for processing the linear elastomer with an effective amount of the branched elastomer to improve processability, and nanocomposites, curable compositions, cured compositions and useful articles formed from the branched elastomer and the linear-branched elastomer blends.
    Type: Grant
    Filed: March 10, 2006
    Date of Patent: August 3, 2010
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Weiqing Weng, David Y. Chung, Anthony Jay Dias, Yuan-Ju (Ray) Chen, Alan A. Galuska, James R. Ayers
  • Patent number: 7638573
    Abstract: The present invention provides a method to form a nanocomposite including blending a high molecular weight elastomer, a low molecular weight elastomer, and a clay to form a nanocomposite; wherein the high molecular weight elastomer has a weight average molecular weight greater than 250000; wherein the low molecular weight elastomer has a weight average molecular weight less than 150000. In another embodiment, the invention provides a method to form a nanocomposite including the steps of blending a low molecular weight elastomer and a clay to form a first mixture; blending a high molecular weight elastomer and the first mixture to form the nanocomposite; wherein the low molecular weight elastomer has a weight average molecular weight less than 150000; and, wherein the high molecular weight elastomer has a weight average molecular weight greater than 250000.
    Type: Grant
    Filed: April 7, 2006
    Date of Patent: December 29, 2009
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Hsien-Chang Wang, Ramanan Krishnamoorti, Mun F. Tse, Anthony J. Dias, David Y. Chung, Alan A. Galuska
  • Publication number: 20080234447
    Abstract: The disclosure provides for a process and polymerization system to produce isoolefin polymers (72) utilizing polymorphogenates (16, 26) in the catalyst system to control polydispersity (MWD). The disclosure also provides a catalyst system (20) comprising a plurality of active catalyst complex species (34) formed by combination of a Lewis acid (24), an initiator (22) and a polymorphogenate (26), as well as polymers made using the catalyst system or process. The polymorphogenate (16, 26) can promote or mimic the formation of different active catalyst complex species (34) having different polymerization rates, i.e. different rates of propagation, chain transfer, or termination, as observed by different polydispersities resulting from the presence of relatively different proportions of the polymorphogenate.
    Type: Application
    Filed: March 23, 2007
    Publication date: September 25, 2008
    Inventors: Timothy D. Shaffer, Michael F. McDonald, David Y. Chung, Robert N. Webb, Deborah J. Davis, Pamela J. Wright
  • Patent number: 7402636
    Abstract: The disclosure provides a slurry polymerization system and method to decrease polymer deposition on reactor surfaces using an oxygenate such as alcohol (16) supplied to the polymerization medium (32) separate from the catalyst feed (34).
    Type: Grant
    Filed: March 23, 2007
    Date of Patent: July 22, 2008
    Assignee: ExxonMobil Chemical Patents Inc
    Inventors: Timothy D. Shaffer, Michael F. McDonald, David Y. Chung, Robert N. Webb, Deborah J. Davis, Pamela J. Wright
  • Publication number: 20070238822
    Abstract: The present invention provides a method to form a nanocomposite including blending a high molecular weight elastomer, a low molecular weight elastomer, and a clay to form a nanocomposite; wherein the high molecular weight elastomer has a weight average molecular weight greater than 250000; wherein the low molecular weight elastomer has a weight average molecular weight less than 150000. In another embodiment, the invention provides a method to form a nanocomposite including the steps of blending a low molecular weight elastomer and a clay to form a first mixture; blending a high molecular weight elastomer and the first mixture to form the nanocomposite; wherein the low molecular weight elastomer has a weight average molecular weight less than 150000; and, wherein the high molecular weight elastomer has a weight average molecular weight greater than 250000.
    Type: Application
    Filed: April 7, 2006
    Publication date: October 11, 2007
    Inventors: Hsien-Chang Wang, Ramanan Krishnamoorti, Mun F. Tse, Anthony J. Dias, David Y. Chung, Alan A. Galuska
  • Patent number: 6939933
    Abstract: The invention relates to a new catalyst system that improves the heat transfer capability of a butyl reactor slurry process system in the production of random copolymers of one or more isoolefin monomers and one or more conjugated diene monomers in continuous slurry polymerization processes. The process is carried out in an anhydrous polymerization system containing a mixture of the monomers in a polar diluent along with a Lewis acid and a C5 or greater initiator having a tertiary halide.
    Type: Grant
    Filed: February 14, 2001
    Date of Patent: September 6, 2005
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Robert N. Webb, David Y. Chung, Andrew B. Donnalley, Michael F. McDonald, Kenneth W. Powers, Ralph Howard Schatz
  • Publication number: 20040054103
    Abstract: The invention relates to a new catalyst system that improves the heat transfer capability of a butyl reactor slurry process system in the production of random copolymers of one or more isoolefin monomers and one or more conjugated diene monomers in continuous slurry polymerization processes. The process is carried out in an anhydrous polymerization system containing a mixture of the monomers in a polar diluent along with a Lewis acid and a C5 or greater initiator having a tertiary halide.
    Type: Application
    Filed: June 2, 2003
    Publication date: March 18, 2004
    Inventors: Robert N. Webb, David Y. Chung, Andrew B. Donnalley, Michael E. McDonald, Kenneth W. Powers, Ralph Howard Schatz
  • Patent number: 5565161
    Abstract: Multiple sequential chemical reactions on a polymeric feedstock are carried out in an extruder with multiple reaction zones. Each reaction zone has means for introduction of reagents, for mixing of reagents with polymer and for removal of by/co-products or unreacted reagents.
    Type: Grant
    Filed: February 1, 1995
    Date of Patent: October 15, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Richard S. Auda, William M. Davis, David Y. Chung, Lawrence W. Flatley, Jr., Brenton G. Jones, Donald A. White, Hans G. Woudboer
  • Patent number: 5552096
    Abstract: Multiple sequential chemical reactions on a polymeric feedstock are carried out in an extruder with multiple reaction zones. Each reaction zone has means for introduction of reagents, for mixing of reagents with polymer and for removal of by/co-products or unreacted reagents.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: September 3, 1996
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Richard S. Auda, William M. Davis, David Y. Chung, Lawrence W. Flatley, Brenton G. Jones, Donald A. White, Hans G. Woudboer
  • Patent number: 5427702
    Abstract: The present invention relates to novel multifunctional viscosity modifiers comprising a mixture of derivatized ethylene-alpha olefin copolymers, A and B. Said A copolymer comprising from about 30 to about 60 weight percent monomer units derived from ethylene and said B copolymer comprising from about 60 to about 80 weight percent units derived from ethylene.
    Type: Grant
    Filed: December 11, 1992
    Date of Patent: June 27, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: David Y. Chung, Paul Brice, Steven J. Searis, Mark J. Struglinski, John B. Gardiner
  • Patent number: 5424367
    Abstract: Multiple sequential chemical reactions on a polymeric feedstock are carried out in an extruder with multiple reaction zones. Each reaction zone has means for introduction of reagents, for mixing of reagents with polymer and for removal of by/co-products or unreacted reagents.
    Type: Grant
    Filed: December 11, 1992
    Date of Patent: June 13, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Richard S. Auda, William M. Davis, David Y. Chung, Lawrence W. Flatley, Brenton G. Jones, Donald A. White, Hans G. Woudboer
  • Patent number: 5401427
    Abstract: Degraded molecular weight copolymers of ethylene alpha-olefin are provided. The ethylene alpha-olefin copolymers, before degradation, are characterized by having a narrow molecular weight distribution and are comprised of intramolecularly heterogeneous and intermolecularly homogeneous copolymer chains. The degraded copolymers are useful as viscosity index improvers for oils.
    Type: Grant
    Filed: June 18, 1993
    Date of Patent: March 28, 1995
    Assignee: Exxon Chemical Patents Inc.
    Inventors: David Y. Chung, Mark J. Struglinski
  • Patent number: 5356551
    Abstract: Oleaginous compositions, particularly lubricating oil compositions, exhibiting improved low temperature viscometric properties containing a viscosity index improving amount of a V.I.-dispersant comprised of the reaction products of:(a) an oil soluble ethylene copolymer comprising from about 15 to 90 wt. % ethylene and from about 10 to 85 wt. % of at least one C.sub.3 to C.sub.28 alpha-olefin, having a number average molecular weight of from about 5,000 to 500,000, grafted with an ethylenically unsaturated carboxylic acid material having 1 or 2 acid or anhydride moieties;(b) an organic polyamine having at least two primary amino groups or a polyol; and(c) an amount effective to provide a V.I. improver-dispersant exhibiting improved low temperature viscometric properties of high functionality long chain hydrocarbyl substituted dicarboxylic acid material having a functionality of at least 1.2.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: October 18, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventors: David Y. Chung, John E. Johnston
  • Patent number: 5348673
    Abstract: Composition of matter useful as multifunctional viscosity index improver for lubricating oil comprising reaction product of: (i) (a) molecular weight degraded ethylene-alpha-olefin copolymer obtained by degrading copolymer of ethylene and at least one other alpha-olefin monomer, said copolymer comprising intramolecularly heterogeneous copolymer chains containing at least one crystallizable segment of methylene units and at least one low crystallinity ethylene-alpha-olefin copolymer segment, wherein said copolymer has a molecular weight distribution characterized by at least one of a ratio of M.sub.w /M.sub.n of less than 2 and a ratio of M.sub.z /M.sub.w of less than 1.8, and said degraded copolymer grafted with (b) ethylenically monounsaturated carboxylic acid material having 1 to 2 carboxylic acid groups or anhydride group to form grafted ethylene copolymer; (ii) about C.sub.50 to about C.sub.
    Type: Grant
    Filed: December 8, 1993
    Date of Patent: September 20, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventors: David Y. Chung, Antonio Gutierrez, Mark J. Struglinski
  • Patent number: 5328624
    Abstract: Oil-soluble, derivatized ethylene copolymers derived from about 15 to 90 wt. % ethylene, and one or more C.sub.3 to C.sub.28 alpha-olefins, e.g. propylene, which are grafted, preferably solution-grafted under an inert atmosphere and at elevated temperatures and in the presence of a high-temperature decomposable free-radical initiator, with an ethylenically-unsaturated dicarboxylic acid material and thereafter reacted with a polyamine having at least two primary amine groups, e.g. an alkylene polyamine such as diethylene triamine, to form carboxyl-grafted polymeric imide, usually maleimide, derivatives are subsequently reacted with a C.sub.12 to about C.sub.18 hydrocarbyl substituted dicarboxylic acid anhydride, preferably a C.sub.12 to about C.sub.18 hydrocarbyl substituted succinic anhydride, to yield an oil-soluble stable imide of said carboxyl-grafted copolymeric imide whereby oil solutions thereof are characterized by minimal viscosity change over an extended period of time.
    Type: Grant
    Filed: August 30, 1993
    Date of Patent: July 12, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventor: David Y. Chung