Patents by Inventor David W. Leung

David W. Leung 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: 20020103195
    Abstract: The invention relates to triazines and the use thereof to inhibit lysophosphatidic acid acyltransferase &bgr; (LPAAT-&bgr;) activity. The invention further relates to methods of treating cancer using said triazines. The invention also relates to methods for screening for LPAAT-&bgr; activity.
    Type: Application
    Filed: October 31, 2001
    Publication date: August 1, 2002
    Applicant: CELL THERAPEUTICS,INC.
    Inventors: Lynn Bonham, J. Peter Klein, Robert E. Finney, David M. Hollenback, Scott A. Shaffer, Norina M. Tang, Thayer H. White, David W. Leung
  • Patent number: 6300487
    Abstract: Polypeptides are obtained, for example, via expression of encoding cDNA sequences, that have the activity of the enzyme lysophosphatidic acid acyltransferase (LPAAT), also known as 1-acyl sn-glycerol-3-phosphate acyltransferase.
    Type: Grant
    Filed: December 18, 1998
    Date of Patent: October 9, 2001
    Assignee: Cell Therapuetics, Inc.
    Inventors: David W. Leung, Daniel Adourel, David Hollenback
  • Patent number: 6274363
    Abstract: Three new isoforms of phosphatidylcholine phospholipase D, hPLD2.1, hPLD2.2 and hPLD1.5, can be produced recombinantly and are useful for screening compounds, as drug candidates, for an ability to modify PCPLD activity.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: August 14, 2001
    Assignee: Cell Therapeutics, Inc.
    Inventors: David W. Leung, Christopher K. Tompkins
  • Patent number: 6200769
    Abstract: There is disclosed cDNA sequences and polypeptides having the enzyme CDP-diacylglycerol synthase (CDS) activity. CDS is also known as CTP:phosphatidate cytidylyltransferase. There is further disclosed methods for isolation and production of polypeptides involved in phosphatidic acid metabolism and signaling in mammalian cells, in particular, the production of purified forms of CDS.
    Type: Grant
    Filed: June 16, 1999
    Date of Patent: March 13, 2001
    Assignee: Cell Therapeutics, Inc.
    Inventors: David W. Leung, Reitha Weeks
  • Patent number: 6171824
    Abstract: Therapeutic hybrid cytokines, having a size ranging from about 10 to about 30 kDa, comprise portions of cytokines: leukemia inhibitory factor (LIF), granulocyte-colony stimulating factor (G-CSF), interleukin-6 (IL-6), interleukin-11 (IL-11), oncostatin-M (OSM), and ciliaryneurotrophic factor (CNTF). Hybrid cytokines comprise three or four &agr;-helical sequences selected from &agr;-helical sequences of IL-6, G-CSF, LIF, IL-11, CNTF and OSM and linking sequences of 5-40 amino acids in length, selected from the linking sequences of IL-6, G-CSF, LIF, IL-11, CNTF and OSM or other, desirable linking sequences. In the hybrid cytokines, at least one &agr;-helical sequence is derived from a different cytokine than at least one other &agr;-helical sequence; or, at least one linking sequence of a cytokine differentiates the hybrid cytokine from a corresponding cytokine.
    Type: Grant
    Filed: November 8, 1993
    Date of Patent: January 9, 2001
    Assignee: Fred Hutchinson Cancer Research Center
    Inventors: George J. Todaro, David W. Leung, Timothy M. Rose
  • Patent number: 6136964
    Abstract: There is disclosed cDNA sequences and polypeptides having the enzyme lysophosphatidic acid acyltransferase (LPAAT) activity. LPAAT is also known as 1-acyl sn-glycerol-3-phosphate acyltransferase.
    Type: Grant
    Filed: March 19, 1996
    Date of Patent: October 24, 2000
    Assignee: Cell Therapeutics, Inc.
    Inventors: David W. Leung, James W. West, Christopher K. Tompkins
  • Patent number: 6060263
    Abstract: There is disclosed cDNA sequences and polypeptides having the enzyme lysophosphatidic acid acyltransferase (LPAAT) activity. LPAAT is also known as 1-acyl sn-glycerol-3-phosphate acyltransferase.
    Type: Grant
    Filed: September 21, 1999
    Date of Patent: May 9, 2000
    Assignee: Cell Therapeutics, Inc.
    Inventors: David W. Leung, James W. West, Christopher K. Tompkins
  • Patent number: 5985926
    Abstract: There is disclosed a method of preventing or delaying the occurrence of acquired immunodeficiency syndrome (AIDS) in human immunodeficiency virus (HIV) seropositive humans by administering an effective amount of a compound that inhibits cellular signaling through a specific phospholipid-based cellular signaling and signal amplification pathway. The invention further provides a method for preventing or delaying clinical symptoms of a group of viral diseases wherein the viral disease is mediated by host cell viral replication. The invention provides an advantage by attacking host cellular signaling mechanisms to prevent the development of drug resistance from rapidly mutating viruses.
    Type: Grant
    Filed: February 10, 1997
    Date of Patent: November 16, 1999
    Assignee: Cell Therapeutics, Inc.
    Inventors: David W. Leung, Gail E. Underiner, Jack W. Singer
  • Patent number: 5952480
    Abstract: There is disclosed cDNA sequences and polypeptides having the enzyme CDP-diacylglycerol synthase (CDS) activity. CDS is also known as CTP:phosphatidate cytidylytransferase. There is further disclosed methods for isolation and production of polypeptides involved in phosphatidic acid metabolism and signaling in mammalian cells, in particular, the production of purified forms of CDS.
    Type: Grant
    Filed: June 28, 1996
    Date of Patent: September 14, 1999
    Assignee: Cell Therapeutics, Inc.
    Inventors: David W. Leung, Reitha Weeks
  • Patent number: 5859222
    Abstract: Disclosed are human cDNA and polypeptides sequences having phosphatidylcholine phospholipase D (PCPLD).
    Type: Grant
    Filed: December 17, 1996
    Date of Patent: January 12, 1999
    Assignee: Cell Therapeutics, Inc.
    Inventors: David W. Leung, Christopher K. Tompkins
  • Patent number: 5807861
    Abstract: A method for treating a disease caused by an undesirable cell response mediated by a proliferative intracellular signaling pathway is provided wherein an effective amount of a compound is administered. The compound, resolved enantiomers, diastereomers, hydrates, salts, solvates and mixtures thereof, has the formulaCORE MOIETY--(R).sub.jwherein j is an integer from one to three; the core moiety is xanthinyl; and R is independently selected from the group consisting of amine, hydrogen, halogen, hydroxyl, C.sub.(1-10) alkyl, C.sub.(2-10) alkenyl, 2-bromopropyl, 4-chloropentyl, cyclohexyl, cyclopentyl, 3-dimethylaminobutyl, 2-hydroxyethyl, 5-hydroxyhexyl, 3-hydroxy-n-butyl, 3-hydroxypropyl, 2-methoxyethyl, 4-methoxy-n-butyl, phenyl, and formula I, at least one R comprising formula I ##STR1## wherein (CH.sub.2).sub.n is optionally substituted; n is an integer from five to twenty; each R.sub.1 or R.sub.2 is independently hydrogen or an optionally substituted group that is herein defined; andwherein, when the (CH.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 15, 1998
    Assignee: Cell Therapeutics, Inc.
    Inventors: J. Peter Klein, Gail E. Underiner, Anil M. Kumar, Lance H. Ridgers, Glenn C. Rice, David W. Leung
  • Patent number: 5756511
    Abstract: A method for treating symptoms of Alzheimer's Disease by administering an effective amount of a compound, racemate, isolated R or S enantionmer, solvate, hydrate or salt having the formula:X--terminal heterocyclic moiety.In the above formula, the terminal heterocyclic moiety is a 3,7-dimethylxanthinyl, 3-methylxanthinyyl or xanthinyl moiety and X is: ##STR1## n is zero or an integer from one to four; and m is an integer from seven to fourteen. For compounds useful in the inventive method, R.sub.1 and R.sub.2 are hydrogen, a straight or branched chain alkyl, alkenyl or alkynyl of up to twenty carbon atoms in length or --(CH.sub.2).sub.w R.sub.5. w may be an integer from one to twenty and R.sub.5 is preferably an hydroxyl, halo C.sub.1-8 alkoxyl group or a substituted or unsubstituted carbocycle or heterocycle. R.sub.3 in compounds useful in the inventive method may be either an hydroxyl group, an oxygen atom, the single bond represented being instead a double bond, or --O--R.sub.4, R.sub.4 being a C.sub.
    Type: Grant
    Filed: April 3, 1995
    Date of Patent: May 26, 1998
    Assignee: Cell Therapeutics, Inc.
    Inventors: James W. West, David W. Leung, J. Peter Klein, Gail E. Underiner, Anil M. Kumar
  • Patent number: 5688763
    Abstract: Growth hormone receptor and growth hormone binding protein are purified enabling amino acid sequence and DNA isolates coding for growth hormone receptor and growth hormone binding protein and methods of obtaining such DNA are provided, together with expression systems for recombinant production of growth hormone receptor and growth hormone binding protein. Therapeutically useful forms of the growth hormone receptor and growth hormone binding protein and anti-receptor antibodies are described.
    Type: Grant
    Filed: May 25, 1994
    Date of Patent: November 18, 1997
    Inventors: R. Glenn Hammonds, Jr., David W. Leung, Steven A. Spencer, William I. Wood, Peter Cameron Colosi
  • Patent number: 5057417
    Abstract: Growth hormone receptor and growth hormone binding protein are purified enabling amino acid sequence and DNA isolates coding for growth hormone receptor and growth hormone binding protein and methods of obtaining such DNA are provided, together with expression systems for recombinant production of growth hormone receptor and growth hormone binding protein. Therapeutically useful forms of the growth hormone receptor and growth hormone binding protein and anti-receptor antibodies are described.
    Type: Grant
    Filed: June 12, 1987
    Date of Patent: October 15, 1991
    Assignee: Genentech, Inc.
    Inventors: R. Glenn Hammonds, David W. Leung, Steven A. Spencer, William I. Wood
  • Patent number: 4857637
    Abstract: The activity of growth-associated receptors is modulated in vivo in a controlled and reproducible fashion by immunizing animals against target growth-associated receptors. This is accomplished by the use of immunogens predetermined to induce primarily agonist or antagonist responses. The immunogens include anti-ligand antibodies and receptor derivatives.
    Type: Grant
    Filed: June 12, 1987
    Date of Patent: August 15, 1989
    Assignee: Genentech, Inc.
    Inventors: R. Glenn Hammonds, David W. Leung, David W. Martin, Jr., Steven A. Spencer, William I. Wood
  • Patent number: 4775622
    Abstract: Yeast organisms are caused to express, process, and secrete protein that is normally heterologous to yeast and not required for its viability by transforming yeast with an expression vector containing a gene encoding heterologous protein and a signal sequence also heterologous to yeast.
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: October 4, 1988
    Assignee: Genentech, Inc.
    Inventors: Ronald A. Hitzeman, David W. Leung