Patents by Inventor Ping W. Chang

Ping W. Chang 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).

  • 3-Alpha-hydroxy 21-n-heteroaryl-pregnane derivatives for modulation of brain excitability and a process for the production thereof
    Publication number: 20090118248
    Abstract: The invention relates to a novel multi step process of making compounds of Formula I: wherein R1 is an alkoxy group and R2 is an optionally substituted, N-attached heteroaryl. The hydrogen at the 5-position can be ? or ? isomer, preferably ?. Preferably the compound of Formula I is 17? isomer. The invention also relates to novel 3?-hydroxy-3?-substituted-17-substituted steroid compounds having GABAA receptor modulating activity, pharmaceutical compositions comprising these compounds, and the use of these compounds in a method of modulating brain excitability.
    Type: Application
    Filed: April 22, 2005
    Publication date: May 7, 2009
    Applicant: Euro-Celtique S.A.
    Inventors: Ping W. Chang, Ning Zhong, Xinping Fang, Shao-Kun Pang, Chi-Nung Hsiao, Tsung-Cheng Hu
  • Process for preparing a browning composition
    Patent number: 5258194
    Abstract: A browning composition is prepared by mixing an oil phase containing an emulsifier with an aqueous phase containing a colorant under shear conditions to form a dispersion of the aqueous phase in the oil phase.
    Type: Grant
    Filed: August 14, 1992
    Date of Patent: November 2, 1993
    Assignee: Pfizer Inc.
    Inventors: James M. Anderson, Ping W. Chang, Christopher A. Macri, James W. Miller, Divina V. Sarges
  • Browning composition and process for browning foods
    Patent number: 5139800
    Abstract: There is disclosed a browning composition for uncooked foods comprising a colorant and a fat or an oil. Also disclosed is a process for imparting a brown color to cooked foods by using the composition of the present invention on foods cooked, for example, in a microwave oven.
    Type: Grant
    Filed: November 2, 1990
    Date of Patent: August 18, 1992
    Assignee: Pfizer Inc
    Inventors: James M. Anderson, Ping W. Chang, Christopher A. Macri, James W. Miller, Divina V. Sarges
  • Aqueous sulfomethylated melamine gel-forming compositions and methods of use
    Patent number: 4821802
    Abstract: Aqueous gel-forming compositions are prepared by reacting for 1-10 hours at 50.degree.-95.degree. C., melamine, formaldehyde and a sulfurous acid salt with the optional addition of a gel-modifying agent and/or a gelling agent which is added to the composition immediately prior to use.
    Type: Grant
    Filed: September 1, 1988
    Date of Patent: April 18, 1989
    Assignee: Pfizer Inc.
    Inventors: Clifford N. Meltz, Gordon D. Gruetzmacher, Ping W. Chang
  • Aqueous sulfomethylated melamine gel-forming compositions
    Patent number: 4772641
    Abstract: Aqueous gel-forming compositions are prepared by reacting for 1-10 hours at 50.degree.-95.degree. C., melamine, formaldehyde and a sulfurous acid salt with the optional addition of a gel-modifying agent and/or a gelling agent which is added to the composition immediately prior to use.
    Type: Grant
    Filed: June 20, 1985
    Date of Patent: September 20, 1988
    Assignee: Pfizer Inc.
    Inventors: Clifford N. Meltz, Gordon D. Gruetzmacher, Ping W. Chang
  • Enhanced hydrocarbon recovery by permeability modification with phenolic gels
    Patent number: 4708974
    Abstract: Hydrocarbon recovery from subterranean reservoirs that are penetrated by either injector or producer wells is enhanced by selective permeability modification of the strata of the reservoir with gel-forming phenolic compositions. The injection of the phenolic composition follows a pH sequence specific to the reservoir environment which allows emplacement of the gel-forming composition the desired distance away from the wellbore and production of a uniform gel throughout the treated hydrocarbon-bearing reservoir. The permeability of a treated subterranean reservoir can be restored by treatment of the reservoir with either aqueous hypochlorite or mineral acid.
    Type: Grant
    Filed: October 1, 1984
    Date of Patent: November 24, 1987
    Assignee: Pfizer Inc.
    Inventors: Ping W. Chang, Gordon D. Gruetzmacher, Clifford N. Meltz, Rocco A. Totino