Patents by Inventor David Tsai

David Tsai 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: 7240816
    Abstract: A rack for supporting at least one bicycle in position includes a base. Two beams are pivotally connected with the base. At least one supporting device is attached to each of the beams in order to support one wheel of the bicycle. A post is pivotally connected with the base. A hooking device is attached to the post in order to hook the bicycle.
    Type: Grant
    Filed: September 20, 2004
    Date of Patent: July 10, 2007
    Inventor: David Tsai
  • Patent number: 7238662
    Abstract: This invention characterizes the selective apoptotic activity of specially prepared Alpha 2-HS glycoprotein and fragments thereof. Specifically, Alpha 2-HS glycoprotein which has been overloaded with zinc, as well as fragnents thereof, selectively induce apoptosis in HT-29 (colon cancer), LNCaP (prostate cancer) and Hep G2 (hepatoma) cells while having no effect on CCD 18 Co (normal colon) cells.
    Type: Grant
    Filed: October 8, 2002
    Date of Patent: July 3, 2007
    Assignee: Ambryx Biotechnology, Inc.
    Inventor: David Tsai
  • Publication number: 20070093737
    Abstract: A massaging device includes a main body, a massaging member, a rotation member, a retaining ring, a protective hood, a motor, and a cover. Thus, the massaging device provides a soft massaging effect in a water flush manner without applying an excessive force on a user, thereby efficiently producing a comfortable sensation to the user. In addition, the massaging device can function as an individual massager and can also be mounted on other massager to provide a massaging effect, thereby enhancing the versatility of the massaging device.
    Type: Application
    Filed: October 25, 2005
    Publication date: April 26, 2007
    Inventors: Wen-Ching Lee, David Tsai
  • Patent number: 7193040
    Abstract: This invention characterizes the specific peptide fragment derived from specially prepared zinc charged fetuin and a method of preparation thereof, wherein the fragment was found to contain an apoptosis-inducing activity. Specifically, the amino acid sequence of this peptide is His Thr Phe Ser Gly Val Ala Ser Val Glu and correlates to amino acid no. 300-309 of fetuin, referred to herein as Fetuin Peptide Fragment (FPF 300-09). FPF 300-09 strongly induced apoptosis in LNCaP (prostate cancer) and HT-29 (colon cancer) cells without affecting CCD 18 Co (normal colon) cells. The in vitro tissue culture study demonstrated that the FPF 300-09 is more potent than the parent molecule (full-length zinc charged fetuin) in inducing apoptosis. FPF 300-09 has a LD50 of 0.3–0.4 ?M while the LD50 for zinc-charged fetuin is 3–10 ?M.
    Type: Grant
    Filed: February 5, 2004
    Date of Patent: March 20, 2007
    Inventor: David Tsai
  • Publication number: 20070004617
    Abstract: Compositions and methods for treating or preventing, for example, overweight or obesity are provided. Compositions provided comprise zinc-charged, protease digested serum or milk proteins. Compositions are administered in a therapeutically effective amount to treat or prevent, for example, overweight or obesity.
    Type: Application
    Filed: April 25, 2006
    Publication date: January 4, 2007
    Inventor: David Tsai
  • Publication number: 20060266717
    Abstract: A rack is disclosed for regulating the parking of bicycles. The rack includes a base that provides flexibility in length and at least one pair of restraints installed on the base. The base includes a first lateral tube, a second lateral tube and at least one pair of transverse tubes. The first lateral tube includes a central portion and two ends extending from the central portion. The second lateral tube includes a central portion and two ends extending from the central portion. Each transverse tube includes a first end connected to one of the ends of the first lateral tube and a second end connected to one of the ends of the second lateral tube. The pair of restraints is installed on the pair of transverse tubes.
    Type: Application
    Filed: May 24, 2005
    Publication date: November 30, 2006
    Inventor: David Tsai
  • Publication number: 20060258595
    Abstract: This invention characterizes the specific peptide fragment derived from specially prepared zinc charged fetuin and a method of preparation thereof, wherein the fragment was found to contain an apoptosis-inducing activity. Specifically, the amino acid sequence of this peptide is His Ala Phe Ser Pro Val Ala Ser Val Glu. The peptide induced apoptosis in LNCaP (prostate cancer) and HT-29 (colon cancer) cells without affecting CCD 18 Co (normal colon) cells. The in vitro tissue culture study demonstrated that the peptide is more potent than the parent molecule (full-length zinc charged fetuin) in inducing apoptosis. The peptide has a LD50 of 0.3-0.4 ?M, while the LD50 for zinc-charged fetuin is 3-10 ?M.
    Type: Application
    Filed: April 24, 2006
    Publication date: November 16, 2006
    Inventor: David Tsai
  • Publication number: 20060255082
    Abstract: A fastening apparatus includes an installing device, a first fastening device and a second fastening device. The installing device is used for installment on a truck. The first fastening device is provided on the installing device for fastening a rope. The second fastening device is provided on the installing device for fastening a front fork of a bicycle.
    Type: Application
    Filed: May 12, 2005
    Publication date: November 16, 2006
    Inventor: David Tsai
  • Publication number: 20060247437
    Abstract: The present invention discloses a novel process to prepare ketone amides, which are useful intermediates for the preparation of antagonists of CCR5 receptor and therefore useful for the treatment of HIV virus infected mammals. It specifically discloses a novel process to synthesize 1-(2,4-dimethylpyrimidine-5-carbonyl)-4-piperidone, 1-[(2,4-dimethyl-3-pyridinyl)carbonyl]-4-piperidone and related compounds. A salient feature of the invention is the use of a three-phase reaction medium with an organic phase and a buffer salt slurry.
    Type: Application
    Filed: January 5, 2006
    Publication date: November 2, 2006
    Inventors: Shen-Chun Kuo, David Tsai, Hongbiao Liao
  • Publication number: 20060194736
    Abstract: This invention characterizes the specific peptide fragment derived from specially prepared zinc charged fetuin and a method of preparation thereof, wherein the fragment was found to contain an apoptosis-inducing activity. Specifically, the amino acid sequence of this peptide is His Thr Phe Ser Gly Val Ala Ser Val Glu. The peptide induced apoptosis in LNCaP (prostate cancer) and HT-29 (colon cancer) cells without affecting CCD 18 Co (normal colon) cells. The in vitro tissue culture study demonstrated that the peptide is more potent than the parent molecule (full-length zinc charged fetuin) in inducing apoptosis. The peptide has a LD50 of 0.3-0.4 ?M, while the LD50 for zinc-charged fetuin is 3-10 ?M.
    Type: Application
    Filed: April 24, 2006
    Publication date: August 31, 2006
    Inventor: David Tsai
  • Publication number: 20060173189
    Abstract: The present invention relates to an improved process for preparing himbacine analogs. The compounds are useful as thrombin receptor antagonists. The improved process may allow for at least one of easier purification by crystallization, easier scalability, and improved process yield on the desired enantiomer.
    Type: Application
    Filed: January 12, 2006
    Publication date: August 3, 2006
    Inventors: Tiruvettipuram Thiruvengadam, Tao Wang, Jing Liao, John Chiu, David Tsai, Hong-Chang Lee, Wenxue Wu, Xiaoyong Fu
  • Publication number: 20050282738
    Abstract: This invention characterizes the selective apoptotic activity of specially prepared zinc charged alpha 1-acid glycoprotein, alpha 2-HS glycoprotein, and alpha 1-antitrypsin. These proteins cause apoptosis in cancer cells while leaving normal cells intact. In addition, active fragments of zinc charged alpha 1-acid glycoprotein and alpha 2-HS glycoprotein, whether manufactured from the modification of natural alpha 1-acid glycoprotein or alpha 2-HS glycoprotein, recombinantly, or synthetically, selectively induce apoptosis.
    Type: Application
    Filed: January 26, 2004
    Publication date: December 22, 2005
    Inventor: David Tsai
  • Publication number: 20050277594
    Abstract: This invention characterizes the specific peptide fragment derived from specially prepared zinc charged fetuin and a method of preparation thereof, wherein the fragment was found to contain an apoptosis-inducing activity. Specifically, the amino acid sequence of this peptide is His Thr Phe Ser Gly Val Ala Ser Val Glu and correlates to amino acid no. 300-309 of fetuin, referred to herein as Fetuin Peptide Fragment (FPF 300-09). FPF 300-09 strongly induced apoptosis in LNCaP (prostate cancer) and HT-29 (colon cancer) cells without affecting CCD 18 Co (normal colon) cells. The in vitro tissue culture study demonstrated that the FPF 300-09 is more potent than the parent molecule (full-length zinc charged fetuin) in inducing apoptosis. FPF 300-09 has a LD50 of 0.3-0.4 ?M, while the LD50 for zinc-charged fetuin is 3-10 ?M.
    Type: Application
    Filed: July 8, 2005
    Publication date: December 15, 2005
    Inventor: David Tsai
  • Publication number: 20050171120
    Abstract: In an illustrative embodiment, the present invention describes the synthesis of the following compound and similar compounds, in high stereochemical purity by a novel stereoselective alkylation process:
    Type: Application
    Filed: March 25, 2005
    Publication date: August 4, 2005
    Inventors: Wenxue Wu, Hongbiao Liao, David Tsai, David Andrews, Dinesh Gala, Gary Lee, Martin Schwartz, Timothy McAllister, Xiaoyong Fu, Donal Maloney, Tiruvettipuram Thiruvengadam, Chou-Hang Tann
  • Publication number: 20050171117
    Abstract: In one embodiment, the present invention discloses a process to directly prepare an unequal ratio of rotamers of an acid salt from a basic compound, by creative choice of a solvent medium. The process is particularly useful in preparing specific rotamers of pharmaceutically useful salts in desired preponderance.
    Type: Application
    Filed: March 30, 2005
    Publication date: August 4, 2005
    Inventors: Dinesh Gala, Andrew Goodman, Gary Lee, Hongbiao Liao, Martin Schwartz, Suhan Tang, David Tsai, Wenxue Wu
  • Publication number: 20050090492
    Abstract: A process for preparing substituted 5-amino-pyrazolo[4,3-e]-1,2,4-triazolo-[1,5-c]pyrimidine compounds having an aminoalkyl substituent at the 7-position is disclosed, wherein the pyrimidine ring is cyclized using a cyanating agent.
    Type: Application
    Filed: October 26, 2004
    Publication date: April 28, 2005
    Inventors: Shen-Chun Kuo, David Tsai, Loc Tran, Pengyi Zhang, Andrew Jones
  • Publication number: 20050061842
    Abstract: A rack is disclosed for supporting at least one bicycle in position. The rack includes a base, two beams pivotally connected with the base, at least one supporting device attached to each of the beams in order to support one wheel of the bicycle, a post pivotally connected with the base and a hooking device attached to the post in order to hook the bicycle.
    Type: Application
    Filed: September 20, 2004
    Publication date: March 24, 2005
    Inventor: David Tsai
  • Publication number: 20040259800
    Abstract: This invention characterizes the specific peptide fragment derived from specially prepared zinc charged fetuin and a method of preparation thereof, wherein the fragment was found to contain an apoptosis-inducing activity. Specifically, the amino acid sequence of this peptide is H-T-F-S-G-V-A-S-V-E and correlates to amino acid no. 300-309 of fetuin, referred to herein as Fetuin Peptide Fragment (FPF 300-09). FPF 300-09 strongly induced apoptosis in LNCaP (prostate cancer) and HT-29 (colon cancer) cells without affecting CCD 18 Co (normal colon) cells. The in vitro tissue culture study demonstrated that the FPF 300-09 is more potent than the parent molecule (full-length zinc charged fetuin) in inducing apoptosis. FPF 300-09 has a LD50 of 0.3-0.4 &mgr;M while the LD50 for zinc-charged fetuin is 3-10 &mgr;M.
    Type: Application
    Filed: February 5, 2004
    Publication date: December 23, 2004
    Inventor: David Tsai
  • Patent number: 6737402
    Abstract: The present invention provides for an improved method of preparing fetuin by using a chelating agent to remove inorganic ions, such as zinc, calcium, and barium, from fetuin. Then, reloading the “naked” fetuin with Zinc Acetate to form a product that is mainly Fetuin-Zinc. This improved method of preparing Fetuin-Zinc or supercharged zinc fetuin increases the effectiveness of inducing apoptosis in cancer cells by three to four times.
    Type: Grant
    Filed: July 9, 2001
    Date of Patent: May 18, 2004
    Inventor: David Tsai
  • Patent number: 6732984
    Abstract: A support apparatus includes a first tube, a second tube pivotally connected with the first tube, a rod telescopically connected with the first tube and a positioning device for retaining the rod in position relative to the first tube. The positioning device includes a mount secured to the first tube and a latch movably mounted on the mount between an engaging position where the latch engages with the rod and a releasing position where the latch releases the rod. The mount includes two lateral portions secured to the first tube. The latch is pivotally mounted on the lateral portions of the mount. Each of the lateral portions of the mount defines an aperture. The latch defines an aperture. A bolt is inserted through the aperture defined in each of the lateral portions of the mount and the aperture defined in the latch. The mount includes an intermediate portion formed between the lateral portions.
    Type: Grant
    Filed: May 29, 2002
    Date of Patent: May 11, 2004
    Inventor: David Tsai