Patents by Inventor Leo Liu

Leo Liu 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: 20070270510
    Abstract: A reactive polymeric surfactant that contains: (a) at least two hydrophilic monomeric units per molecule, each independently according to formula (I): wherein R1 is alkylene or oxyalkylene, R2 is H, methyl, or ethyl, R3 is H, and n is greater than about 5, (b) one or more hydrophobic monomeric units per molecule, each independently according to formula (II) wherein R4 is H or methyl, R5 is a hydrophobic group, is useful in stabilizing aqueous emulsions and aqueous dispersions.
    Type: Application
    Filed: March 28, 2007
    Publication date: November 22, 2007
    Inventor: Leo Liu
  • Publication number: 20070270508
    Abstract: A polymer network, comprises an interfacially polymerized reaction product derived from a surfactant monomer.
    Type: Application
    Filed: March 28, 2007
    Publication date: November 22, 2007
    Inventor: Leo Liu
  • Patent number: 7064243
    Abstract: The invention provides a method of identifying anti-nematode compounds and further provides transgenic nematodes that may be used to practice the method. In particular, the invention provides a screen for compounds that inhibit a nematode secretion pathway e.g, compounds that inhibit the secretion of proteins by nematodes. The transgenic nematodes express reporters for nematode secreted proteins. In preferred embodiments of the invention the screen is performed using C. elegans, i.e., certain embodiments of the invention utilize C. elegans and C. elegans secretory pathways as a model system for parasitic nematodes and parasitic nematode secretion pathways. The invention also provides pharmaceutical compositions that may be used in the treatment and prevention of nematode infection in humans and animals and anti-nematode agents that may be used to protect plants from plant-parasitic nematodes. In addition, the invention provides a genetic screen for identifying additional targets for anti-nematode compounds.
    Type: Grant
    Filed: January 18, 2002
    Date of Patent: June 20, 2006
    Assignee: Cambria Biosciences LLC
    Inventors: Leo Liu, Lucinda Burnam, Ann Sluder, Elizabeth Link, Beth Westlund
  • Publication number: 20060111533
    Abstract: Monomer compounds comprising several cationic groups are provided. The invention also relates to a process for making these monomer compounds. The process is highly selective and prevents unwanted reactions leading to undesired structures. The invention relates also to polymers, including copolymers, comprising units deriving from said monomer compounds. The monomer compounds comprise several cationic groups, e.g.
    Type: Application
    Filed: January 6, 2006
    Publication date: May 25, 2006
    Inventors: Leo Liu, Dominic Yeung
  • Patent number: 7013007
    Abstract: A method for generating power signals within a telephone server coupled to a computer system via an interface bus or in-house power connector, to a maximum number of telephones, and to a telephone trunk, the computer system providing a primary voltage signal and a secondary voltage signal, includes receiving the primary voltage signal and the secondary voltage signal from the computer system, generating a ringer power signal in response to the primary voltage, generating a direct inward dialing power signal in response to the primary voltage, the direct inward dialing power signal configured to provide a first operational power signal for telephones from the maximum number of telephones receiving telephone calls directly from the telephone trunk, generating a second operational power signal in response to the primary voltage for telephones from the maximum number of telephones receiving telephone calls from other telephones from the maximum number of telephones, and generating a ringing signal in response to
    Type: Grant
    Filed: January 11, 1999
    Date of Patent: March 14, 2006
    Assignee: AltiGen Communications, Inc.
    Inventors: Simon Chouldjian, Joseph Chiu, Leo Liu
  • Publication number: 20060029561
    Abstract: A graft copolymer comprises a polysaccharide polymer grafted with a polymer capable of bonding to human hair and is useful in hair care compositions.
    Type: Application
    Filed: August 3, 2005
    Publication date: February 9, 2006
    Inventors: Euen Gunn, Leo Liu, Christian Priou, Alvino Gabbianelli, Stewart Warburton
  • Publication number: 20050124529
    Abstract: The invention relates to the preparation of hydrophobic modified diquaternary cationic monomers and their copolymer as well as the use such monomers and copolymers as thickening agents/rheology modifiers for acidic compositions. The hydrophobic modified diquaternary cationic monomer having the general formula: wherein X is selected from O, NH, or NR; Y is any alkyl, alkylene with or without heteroatoms, and R0, R1, R2 R3, R4, which are identical or different, are selected from C1-C4 alkyl groups, R is selected from any alkyl group with or without heteroatoms, and R5 is a hydrphobe having an alkyl chain of more than 4 atoms.
    Type: Application
    Filed: December 7, 2004
    Publication date: June 9, 2005
    Inventors: Leo Liu, Jeanne Chang
  • Patent number: 6846482
    Abstract: The invention includes an expression vector engineered to produce double-stranded RNA (dsRNA) within a pest to be controlled. The dsRNA inhibits expression of at least one gene within the pest, wherein inhibition of the gene exerts a deleterious effect upon the pest. For example, inhibition of the gene can lead to cessation of feeding, growth, or development and can cause death of the pest. In a preferred embodiment of the invention the expression vector is a recombinant baculovirus that transcribes sense and antisense RNA under the control of the baculovirus IE-1 promoter and hr5 enhancer. Preferred genes to be inhibited include essential genes, genes involved in neurotransmission, and genes that are targets for conventional pesticides. The invention discloses baculovirus transfer plasmids useful for producing the recombinant baculovirus. The invention further discloses methods and formulations involving the expression vector.
    Type: Grant
    Filed: August 13, 2001
    Date of Patent: January 25, 2005
    Assignee: Cambria Biosciences
    Inventors: Leo Liu, Scott Chouinard, James Velema
  • Publication number: 20030126625
    Abstract: The invention provides a method of identifying anti-nematode compounds and further provides transgenic nematodes that may be used to practice the method. In particular, the invention provides a screen for compounds that inhibit a nematode secretion pathway e.g., compounds that inhibit the secretion of proteins by nematodes. The transgenic nematodes express reporters for nematode secreted proteins. In preferred embodiments of the invention the screen is performed using C. elegans, i.e., certain embodiments of the invention utilize C. elegans and C. elegans secretory pathways as a model system for parasitic nematodes and parasitic nematode secretion pathways. The invention also provides pharmaceutical compositions that may be used in the treatment and prevention of nematode infection in humans and animals and anti-nematode agents that may be used to protect plants from plant-parasitic nematodes. In addition, the invention provides a genetic screen for identifying additional targets for anti-nematode compounds.
    Type: Application
    Filed: January 18, 2002
    Publication date: July 3, 2003
    Inventors: Leo Liu, Lucinda Burnam, Ann Sluder, Elizabeth Link, Bethany Westlund
  • Patent number: 6532230
    Abstract: A method for recording mixed-media messages using an integrated messaging server in response to a client application, the integrated messaging server including a processor coupled to a telephone switching server, to a storage, and to a message server, includes the steps of receiving a voice message using a handset coupled with an analog line to the telephone switching server, storing the voice message in the storage, receiving a document from the client application using the message server, and associating the voice message with the document to form a mixed-media message.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: March 11, 2003
    Assignee: Altigen Communications, Inc.
    Inventors: En-Kuang Lung, Donggun Keung, Leo Liu
  • Patent number: 6493439
    Abstract: A method for routing analog Caller ID signals includes receiving an incoming telephone call for a first telephone extension, the incoming telephone call associated with a first set of analog Caller ID signals, asserting a ringing signal to the first telephone extension, the ringing signal including the first set of analog Caller ID signals, coupling the incoming call to the first telephone extension, receiving a request to couple the incoming call from the first telephone extension to a second telephone extension, receiving a request to send the first set of analog Caller ID signals to the second telephone extension, and asserting a ringing signal to the second telephone extension, the ringing signal including the first set of analog Caller ID signals.
    Type: Grant
    Filed: August 2, 2001
    Date of Patent: December 10, 2002
    Assignee: AltiGen Communications, Inc.
    Inventors: En-Kuang Lung, Leo Liu, Donggun Keung, Tzerng-Hong Lin
  • Publication number: 20020137710
    Abstract: The invention includes an expression vector engineered to produce double-stranded RNA (dsRNA) within a pest to be controlled. The dsRNA inhibits expression of at least one gene within the pest, wherein inhibition of the gene exerts a deleterious effect upon the pest. For example, inhibition of the gene can lead to cessation of feeding, growth, or development and can cause death of the pest. In a preferred embodiment of the invention the expression vector is a recombinant baculovirus that transcribes sense and antisense RNA under the control of the baculovirus IE-1 promoter and hr5 enhancer. Preferred genes to be inhibited include essential genes, genes involved in neurotransmission, and genes that are targets for conventional pesticides. The invention discloses baculovirus transfer plasmids useful for producing the recombinant baculovirus. The invention further discloses methods and formulations involving the expression vector.
    Type: Application
    Filed: August 13, 2001
    Publication date: September 26, 2002
    Inventors: Leo Liu, Scott Chouinard, James Velema
  • Publication number: 20020064264
    Abstract: A method for routing analog Caller ID signals includes receiving an incoming telephone call for a first telephone extension, the incoming telephone call associated with a first set of analog Caller ID signals, asserting a ringing signal to the first telephone extension, the ringing signal including the first set of analog Caller ID signals, coupling the incoming call to the first telephone extension, receiving a request to couple the incoming call from the first telephone extension to a second telephone extension, receiving a request to send the first set of analog Caller ID signals to the second telephone extension, and asserting a ringing signal to the second telephone extension, the ringing signal including the first set of analog Caller ID signals.
    Type: Application
    Filed: August 2, 2001
    Publication date: May 30, 2002
    Applicant: AltiGen Communications, Inc.
    Inventors: En-Kuang Lung, Leo Liu, Donggun Keung, Tzerng-Hong Lin
  • Patent number: 6326193
    Abstract: The invention includes an expression vector engineered to produce double-stranded RNA (dsRNA) within a pest to be controlled. The dsRNA inhibits expression of at least one gene within the pest, wherein inhibition of the gene exerts a deleterious effect upon the pest. For example, inhibition of the gene can lead to cessation of feeding, growth, or development and can cause death of the pest. In a preferred embodiment of the invention the expression vector is a recombinant baculovirus that transcribes sense and antisense RNA under the control of the baculovirus IE-1 promoter and hr5 enhancer. Preferred genes to be inhibited include essential genes, genes involved in neurotransmission, and genes that are targets for conventional pesticides. The invention discloses baculovirus transfer plasmids useful for producing the recombinant baculovirus. The invention further discloses methods and formulations involving the expression vector.
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: December 4, 2001
    Assignee: Cambria Biosciences, LLC
    Inventors: Leo Liu, Scott Chouinard, James Velema
  • Patent number: 6292549
    Abstract: A method for routing analog Caller ID signals includes receiving an incoming telephone call for a first telephone extension, the incoming telephone call associated with a first set of analog Caller ID signals, asserting a ringing signal to the first telephone extension, the ringing signal including the first set of analog Caller ID signals, coupling the incoming call to the first telephone extension, receiving a request to couple the incoming call from the first telephone extension to a second telephone extension, receiving a request to send the first set of analog Caller ID signals to the second telephone extension, and asserting a ringing signal to the second telephone extension, the ringing signal including the first set of analog Caller ID signals.
    Type: Grant
    Filed: February 23, 1999
    Date of Patent: September 18, 2001
    Assignee: AltiGen Communications, Inc.
    Inventors: En-Kuang Lung, Leo Liu, Donggun Keung, Tzerng-Hong Lin