Patents by Inventor Hak-Kim Chan

Hak-Kim Chan 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: 20090186088
    Abstract: A process for preparation of particles of an inhalable drug is described. The process comprises combining a first liquid and a second liquid in a region of high shear, whereby the first liquid and the second liquid interact to form the particles of the drug. One of the first and second liquids comprises the drug or a precursor thereof. In the case where one of the liquids comprises the precursor, the other of the first and second liquids comprises a reagent which reacts with the precursor under high shear conditions to form particles of the drug. In the case where one of the liquids comprises the drug, the other of the first and second liquids comprises a liquid which, when mixed with the liquid containing the drug under high shear, forms particles of the drug.
    Type: Application
    Filed: March 8, 2006
    Publication date: July 23, 2009
    Applicant: NanoMaterials Technology Pte Ltd
    Inventors: Hak-Kim Chan, Herbert Clark Chiou, Jian Feng Chen, Ting Ting Hu, Jimmy Sung Lai Yun
  • Publication number: 20090022669
    Abstract: Novel formulations comprising therapeutic agents, a surface tension-controlling agent, and a component that comprises both a humectant and a viscosity-controlling agent for use in thermal droplet ejecting devices are disclosed. The formulations are useful for maintaining controlled and reliable dosage of the therapeutic agent via pulmonary delivery.
    Type: Application
    Filed: June 20, 2008
    Publication date: January 22, 2009
    Inventors: Michael John Waters, Stephen Michael Mahler, Hak-Kim Chan, Stephen Francis Goodall, Nora Y.K. Chew
  • Patent number: 7018825
    Abstract: The present invention relates to the use of calcium ion and/or sugars to minimize thermal aggregation of DNase and to the use of calcium ion to stabilize liquid solutions of DNase, the solutions having a pH of less than neutral. DNase is the active pharmaceutical principle and the solutions may contain other pharmaceutically acceptable excipients making them suitable for pharmaceutical administration. In the first instance, calcium ion/sugar minimizes the effects of thermal aggregation in the solution. In the second aspect, calcium ion stabilizes the lower pH solutions from protein precipitation.
    Type: Grant
    Filed: February 12, 2002
    Date of Patent: March 28, 2006
    Assignee: Genentech, Inc.
    Inventors: Hak-Kim Chan, Igor Gonda, Steven J. Shire, Suzanne Sin-Mui Lo Weck
  • Publication number: 20030064052
    Abstract: Novel formulations comprising therapeutic agents, a surface tension-controlling agent, and a component that comprises both a humectant and a viscosity-controlling agent for use in thermal droplet ejecting devices are disclosed. The formulations are useful for maintaining controlled and reliable dosage of the therapeutic agent via pulmonary delivery.
    Type: Application
    Filed: May 21, 2002
    Publication date: April 3, 2003
    Applicant: Ponwell Enterprises, Ltd.
    Inventors: Michael John Waters, Stephen Michael Mahler, Hak-Kim Chan, Stephen Francis Goodall, Nora Y.K. Chew
  • Publication number: 20030054532
    Abstract: The present invention relates to the use of calcium ion and/or sugars to minimize thermal aggregation of DNase and to the use of calcium ion to stabilize liquid solutions of DNase, the solutions having a pH of less than neutral. DNase is the active pharmaceutical principle and the solutions may contain other pharmaceutically acceptable excipients making them suitable for pharmaceutical administration. In the first instance, calcium ion/sugar minimizes the effects of thermal aggregation in the solution. In the second aspect, calcium ion stabilizes the lower pH solutions from protein precipitation.
    Type: Application
    Filed: February 12, 2002
    Publication date: March 20, 2003
    Applicant: Genentech, Inc.
    Inventors: Hak-Kim Chan, Igor Gonda, Steven J. Shire, Suzanne Sin-Mui Lo Weck
  • Publication number: 20030013634
    Abstract: The invention provides a method for forming fine particles of a substance, the method including contacting a non-gaseous fluid containing the substance with a dense gas to expand the fluid, the dense gas including (a) an anti-solvent and (b) a modifying agent which modifies the polarity of the anti-solvent, and particles formed by the method.
    Type: Application
    Filed: December 7, 2001
    Publication date: January 16, 2003
    Inventors: Neil Russell Foster, Hubert Leonardus Regtop, Fariba Dehghani, Rana Taysir Bastami, Hak-Kim Chan
  • Patent number: 6383788
    Abstract: The present invention relates to the use of calcium ion and/or sugars to minimize thermal aggregation of DNase and to the use of calcium ion to stabilize liquid solutions of DNase, the solutions having a pH of less than neutral. DNase is the active pharmaceutical principle and the solutions may contain other pharmaceutically acceptable excipients making them suitable for pharmaceutical administration. In the first instance, calcium ion/sugar minimizes the effects of thermal aggregation in the solution. In the second aspect, calcium ion stabilizes the lower pH solutions from protein precipitation.
    Type: Grant
    Filed: December 3, 1996
    Date of Patent: May 7, 2002
    Assignee: Genentech, Inc.
    Inventors: Hak-Kim Chan, Igor Gonda, Steven J. Shire, Suzanne Sin-Mui Lo Weck