Patents by Inventor Leon Xu

Leon Xu 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).

  • Patent number: 9657337
    Abstract: Embodiments of the present invention relate to a buffer composition for an integrated nucleic acid amplification and hybridization reaction. The buffer comprise about 50-200 mM of a salt, about 10-30 mM Tris-HCl, about 2-10M Water soluble magnesium salt, about 0.05-1.5% surfactant, about 0.05-0.15 mg/ml stabilizing protein about 50-300 nM of one or more primers, about 20-150 uM of one or more dNTPs, about 5-15% glycerine, about 0.5-1.5% formamide and at least about 5 unit/ml polymerase.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: May 23, 2017
    Assignee: Honeywell International Inc.
    Inventors: Leon Xu, Zhenhong Sun
  • Patent number: 8822677
    Abstract: An improved two stage reaction process for production of mono-L-aspartyl chlorin e6. In a first stage, the activation reaction between chlorin e6 and a carbodiimide produces a previously unknown anhydride in an activation reaction product (Formula I). This reaction product is purified to remove a significant proportion of the precursors of di-L-aspartyl chlorin e6. The purified activation reaction product contains a higher concentration of the previously unknown anhydride. This purified reaction product is used in a second stage: a coupling reaction of the purified activation reaction product with aspartate. The coupling reaction produces a coupling reaction product that has significantly reduced di-L-aspartyl chlorin e6 concentration. This reduced di-L-aspartyl chlorin e6 concentration facilitates purification of mono-L-aspartyl chlorin e6 from the coupling reaction mixture.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: September 2, 2014
    Assignee: Purdue Pharmaceutical Products L.P.
    Inventors: Leon Xu, Alexander J. Pallenberg
  • Patent number: 8741565
    Abstract: A method for detecting a target nucleic acid of a pathogen in a test sample, the method comprising preparing a target nucleic acid detecting reagent and contacting the target nucleic acid detecting reagent with an oligonucleotide microarray. A kit for detecting a target nucleic acid of a pathogen in a test sample is also described. The kit comprises at least one primer pair and an oligonucleotide microarray comprising at least one probe.
    Type: Grant
    Filed: December 28, 2006
    Date of Patent: June 3, 2014
    Assignee: Honeywell International Inc.
    Inventors: Yuandong Gu, Leon Xu
  • Publication number: 20130281689
    Abstract: An improved two stage reaction process for production of mono-L-aspartyl chlorin e6. In a first stage, the activation reaction between chlorin e6 and a carbodiimide produces a previously unknown anhydride in an activation reaction product. This reaction product is purified to remove a significant proportion of the precursors of di-L-aspartyl chlorin e6. The purified activation reaction product contains a higher concentration of the previously unknown anhydride. This purified reaction product is used in a second stage: a coupling reaction of the purified activation reaction product with aspartate. The coupling reaction produces a coupling reaction product that has significantly reduced di-L-aspartyl chlorin e6 concentration. This reduced di-L-aspartyl chlorin e6 concentration facilitates purification of mono-L-aspartyl chlorin e6 from the coupling reaction mixture.
    Type: Application
    Filed: May 16, 2012
    Publication date: October 24, 2013
    Inventors: Leon Xu, Alexander J. Pallenberg
  • Patent number: 8367397
    Abstract: Embodiments of the invention relate to an active biochip for nucleic acid analysis. The biochip comprises an inlet for introducing a nucleic acid sample, fluid channels, valves in contact with the fluid channels and pumps in contact with the fluid channels and adapted to generate a carrier gas or move a buffer through a portion of the fluid channels. The biochip also includes one or more hydroxyapatite columns for separating a portion of the nucleic acid sample, buffer reservoirs in contact with the fluid channels and positioned near the pumps, air exits, a waste reservoir and a nucleic acid analysis region.
    Type: Grant
    Filed: February 15, 2007
    Date of Patent: February 5, 2013
    Assignee: Honeywell International Inc.
    Inventors: Yuandong Gu, Leon Xu
  • Patent number: 8198312
    Abstract: A composition of matter of an anhydride of formula 1 below and an improved two stage reaction process for production of mono-L-aspartyl chlorin e6, utilizing the anhydride:
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: June 12, 2012
    Assignee: Light Sciences Oncology, Inc.
    Inventors: Leon Xu, Alexander J. Pallenberg
  • Patent number: 8124944
    Abstract: A microarray reader (100) comprises a light source (102), beam shaping elements (104) positioned near the light source (102), a moving stage (124) supporting one or more of the light source (102) and beam shaping elements (104), an optical substrate (112) supporting an immobilized microarray, a reaction chamber (116) in contact with the optical substrate (112) and encapsulating buffer solution, a heating/cooling component (118) in contact with the reaction chamber (116), a synchronization circuit, an optical filter (108) and an imaging sensor (106) positioned near the optical filter (108).
    Type: Grant
    Filed: January 17, 2007
    Date of Patent: February 28, 2012
    Assignee: Honeywell International Inc.
    Inventors: Yuan Zheng, Leon Xu, Zhenhong Sun
  • Patent number: 8063203
    Abstract: An improved two stage reaction process for production of mono-L-aspartyl chlorin e6. In a first stage, the activation reaction between chlorin e6 and a carbodiimide produces a previously unknown anhydride in an activation reaction product. This reaction product is purified to remove a significant proportion of the precursors of di-L-aspartyl chlorin e6. The purified activation reaction product contains a higher concentration of the previously unknown anhydride. This purified reaction product is used in a second stage: a coupling reaction of the purified activation reaction product with aspartate. The coupling reaction produces a coupling reaction product that has significantly reduced di-L-aspartyl chlorin e6 concentration. This reduced di-L-aspartyl chlorin e6 concentration facilitates purification of mono-L-aspartyl chlorin e6 from the coupling reaction mixture.
    Type: Grant
    Filed: November 1, 2010
    Date of Patent: November 22, 2011
    Assignee: Light Sciences Oncology, Inc.
    Inventors: Leon Xu, Alexander J. Pallenberg
  • Publication number: 20110105745
    Abstract: An improved two stage reaction process for production of mono-L-aspartyl chlorin e6. In a first stage, the activation reaction between chlorin e6 and a carbodiimide produces a previously unknown anhydride in an activation reaction product. This reaction product is purified to remove a significant proportion of the precursors of di-L-aspartyl chlorin e6. The purified activation reaction product contains a higher concentration of the previously unknown anhydride. This purified reaction product is used in a second stage: a coupling reaction of the purified activation reaction product with aspartate. The coupling reaction produces a coupling reaction product that has significantly reduced di-L-aspartyl chlorin e6 concentration. This reduced di-L-aspartyl chlorin e6 concentration facilitates purification of mono-L-aspartyl chlorin e6 from the coupling reaction mixture.
    Type: Application
    Filed: November 1, 2010
    Publication date: May 5, 2011
    Applicant: Light Sciences Oncology, Inc.
    Inventors: Leon Xu, Alexander J. Pallenberg
  • Publication number: 20100279885
    Abstract: A method for detecting a target nucleic acid of a pathogen in a test sample, the method comprising preparing a target nucleic acid detecting reagent and contacting the target nucleic acid detecting reagent with an oligonucleotide microarray. A kit for detecting a target nucleic acid of a pathogen in a test sample is also described. The kit comprises at least one primer pair and an oligonucleotide microarray comprising at least one probe.
    Type: Application
    Filed: December 28, 2006
    Publication date: November 4, 2010
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventors: Yuandong Gu, Leon Xu
  • Publication number: 20100197517
    Abstract: Embodiments of the present invention relate to a buffer composition for an integrated nucleic acid amplification and hybridization reaction. The buffer comprise about 50-20 OmM of a salt, about 10-30 mM Tris-HCI, about 2-10M Water soluble magnesium salt, about 0.05-1.5% surfactant, about 0.05-0.15 mg/ml stabilizing protein about 50-300 nM of one or more primers, about 20-15 OuM of one or more dNTPs, about 5-15% glycerine, about 0.5-1.5% formamide and at least about 5 unit/ml polymerase.
    Type: Application
    Filed: December 29, 2006
    Publication date: August 5, 2010
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventors: Leon Xu, Zhenhong Sun
  • Publication number: 20100148092
    Abstract: A microarray reader (100) comprises a light source (102), beam shaping elements (104) positioned near the light source (102), a moving stage (124) supporting one or more of the light source (102) and beam shaping elements (104), an optical substrate (112) supporting an immobilized microarray, a reaction chamber (116) in contact with the optical substrate (112) and encapsulating buffer solution, a heating/cooling component (118) in contact with the reaction chamber (116), a synchronization circuit, an optical filter (108) and an imaging sensor (106) positioned near the optical filter (108).
    Type: Application
    Filed: January 17, 2007
    Publication date: June 17, 2010
    Applicant: Honeywell International Inc.
    Inventors: Yuan Zheng, Leon Xu, Zhenhong Sun
  • Patent number: 7629115
    Abstract: The present invention relates to an apparatus for testing multiple sample compounds for their biological effect comprising a porous block having substantially planar top and bottom surfaces. The top surface comprises a plurality of cell adhesive regions and cell dis-adhesive regions and the bottom surface provides multiple sites to load the sample compounds. These sites are located opposite from the cell adhesive regions on the top surface of the porous block. In certain embodiments, the invention further comprises at least one dissolvable layer which provides multiple sites to load the sample compounds.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: December 8, 2009
    Assignee: Honeywell International Inc.
    Inventors: Yuandong Gu, Leon Xu, Jicang Zhou
  • Publication number: 20080199861
    Abstract: Embodiments of the invention relate to a real-time microarray apparatus comprising an upper substrate, a lower substrate, a buffer positioned between the upper and lower substrate, a microarray positioned on either the upper substrate or the lower substrate, a heater positioned near the microarray, a pump positioned near the buffer and microarray and an imaging sensor positioned near the microarray.
    Type: Application
    Filed: February 15, 2007
    Publication date: August 21, 2008
    Inventors: Yuandong Gu, Leon Xu
  • Publication number: 20080199862
    Abstract: Embodiments of the invention relate to an active biochip for nucleic acid analysis. The biochip comprises an inlet for introducing a nucleic acid sample, fluid channels, valves in contact with the fluid channels and pumps in contact with the fluid channels and adapted to generate a carrier gas or move a buffer through a portion of the fluid channels. The biochip also includes one or more hydroxyapatite columns for separating a portion of the nucleic acid sample, buffer reservoirs in contact with the fluid channels and positioned near the pumps, air exits, a waste reservoir and a nucleic acid analysis region.
    Type: Application
    Filed: February 15, 2007
    Publication date: August 21, 2008
    Inventors: Yuandong Gu, Leon Xu
  • Publication number: 20080176768
    Abstract: A method of creating a metal nanoparticle hydrogel biological array comprises placing a plurality of metal nanoparticles in each of a plurality of wells on a substrate, and placing a biomolecular probe material into the plurality of wells. Hydrogel precursors are placed in each of the plurality of wells; and are polymerized to form hydrogel such that the metal nanoparticles are embedded in the hydrogel.
    Type: Application
    Filed: January 23, 2007
    Publication date: July 24, 2008
    Inventors: Yuan Zheng, Jicang Zhou, Leon Xu
  • Publication number: 20080021210
    Abstract: An improved two stage reaction process for production of mono-L-aspartyl chlorin e6. In a first stage, the activation reaction between chlorin e6 and a carbodiimide produces a previously unknown anhydride in an activation reaction product. This reaction product is purified to remove a significant proportion of the precursors of di-L-aspartyl chlorin e6. The purified activation reaction product contains a higher concentration of the previously unknown anhydride. This purified reaction product is used in a second stage: a coupling reaction of the purified activation reaction product with aspartate. The coupling reaction produces a coupling reaction product that has significantly reduced di-L-aspartyl chlorin e6 concentration. This reduced di-L-aspartyl chlorin e6 concentration facilitates purification of mono-L-aspartyl chlorin e6 from the coupling reaction mixture.
    Type: Application
    Filed: June 29, 2007
    Publication date: January 24, 2008
    Applicant: LIGHT SCIENCES ONCOLOGY, INC.
    Inventors: Leon Xu, Alexander Pallenberg
  • Publication number: 20060286661
    Abstract: The present invention relates to an apparatus for testing multiple sample compounds for their biological effect comprising a porous block having substantially planar top and bottom surfaces. The top surface comprises a plurality of cell adhesive regions and cell dis-adhesive regions and the bottom surface provides multiple sites to load the sample compounds. These sites are located opposite from the cell adhesive regions on the top surface of the porous block. In certain embodiments, the invention further comprises at least one dissolvable layer which provides multiple sites to load the sample compounds.
    Type: Application
    Filed: May 13, 2005
    Publication date: December 21, 2006
    Applicant: Honeywell International, Inc.
    Inventors: Yuandong Gu, Leon Xu, Jicang Zhou
  • Patent number: 6449260
    Abstract: An automatic call distribution system utilizes a number of H.323 compatible devices. An automatic call distribution (ACD) server (52) interfaces with a computer telephony interface gateway (54) to route calls to agents or to a music/video server (56). Calls are received by a gateway and supplied to a gatekeeper that determines an IP address of the destination. The ACD server selects the destination in response to the number of agents available. In addition, customer calls can be received via e-mail, facsimile or the Internet. The call distribution system can instruct an agent to return an e-mail or facsimile message or to call a customer if desired. Calls from one H.323 device can be routed to another H.323 device by a third party application by sending a call control message to the device's application program interface that executes the message as if it were generated at the device itself.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: September 10, 2002
    Assignee: Siemens Information and Communication Networks, Inc.
    Inventors: Michael Sassin, Markku Korpi, Richard W. Crouch, Leon Xu, Uwe Wrede, Robert W. Stephens