Patents by Inventor Stephen Hong-Wei Wu

Stephen Hong-Wei Wu 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).

  • Process for production of polymeric powders
    Patent number: 6541542
    Abstract: A novel process for preparing polymers having an average particle size of less than about 40 micrometers is described. The process involves dissolving a polymer in a solvent to form a solution that is introduced into an agitating aqueous medium.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: April 1, 2003
    Assignee: Eastman Chemical Company
    Inventors: Jinghua Yuan, Stephen Hong-Wei Wu
  • Process for production of polymeric powders
    Publication number: 20020042457
    Abstract: A novel process for preparing polymers having an average particle size of less than about 40 micrometers is described. The process involves dissolving a polymer in a solvent to form a solution that is introduced into an agitating aqueous medium.
    Type: Application
    Filed: April 25, 2001
    Publication date: April 11, 2002
    Inventors: Jinghua Yuan, Stephen Hong-Wei Wu
  • Liquid crystalline phase drug delivery vehicle
    Patent number: 6235312
    Abstract: The composition disclosed herein comprises about 55 to about 90 weight percent of a monoglyceride component comprising a monoglyceride having an acyl chain of 12 to 22 carbons, about 5 to about 35 weight percent of an acetylated monoglyceride component comprising an acetylated monoglyceride having an acyl chain of 12 to 22 carbons, and about 2 to about 40 weight percent water. The present composition is a liquid crystalline phase composition at a temperature of about 20 to about 80° C., preferably a cubic liquid crystalline gel.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: May 22, 2001
    Assignee: Eastman Chemical Company
    Inventors: Howard Kenneth Hobbs, Sol Benkendorf, Stephen Hong-Wei Wu
  • Aqueous enteric coating composition and low gastric permeability enteric coating
    Patent number: 6139875
    Abstract: Disclosed herein is an aqueous enteric coating composition comprised of a solution of a water-soluble salt of an enteric coating polymer, with a hydrophobic compound containing 12 to 20 carbon atoms and a water-insoluble solid flake material dispersed in the aqueous solution. The enteric coating formed from the present composition has good mechanical strength and shows superior resistance to attack by atmospheric moisture and simulated gastric fluid, while being readily broken down under the alkaline conditions which exist in the intestine.
    Type: Grant
    Filed: September 29, 1998
    Date of Patent: October 31, 2000
    Assignee: Eastman Chemical Company
    Inventors: Michael Wayne Adams, Stephen Hong-Wei Wu
  • Aqueous enteric coating compositions
    Patent number: 5851579
    Abstract: The present invention sets forth an enteric coating composition comprising a blend ofa) an alkali-soluble acrylic latex polymer andb) an aqueous solution of ammonium or alkaline salts of cellulose polymers.The invention also sets forth a method for preparing an enterically-coated dosage form and a method for preparing the present compositions.
    Type: Grant
    Filed: October 8, 1997
    Date of Patent: December 22, 1998
    Assignee: Eastman Chemical Company
    Inventors: Stephen Hong-Wei Wu, Warren Kent Hopkins
  • PH-sensitive coatings based on cellulose acetoacetate
    Patent number: 5811121
    Abstract: This invention is based on the discovery that certain cellulose acetoacetate mixed esters will remain insoluble in mild (near-neutral) or acidic aqueous solutions, but dissolve under alkaline conditions. The esters are particularly useful as coatings for controlled-release applications. Coatings comprising these esters will dissolve to release a coated active agent under alkaline conditions, the exact pH at which dissolution occurs being adjustable.
    Type: Grant
    Filed: January 29, 1997
    Date of Patent: September 22, 1998
    Assignee: Eastman Chemical Company
    Inventors: Stephen Hong-Wei Wu, Chung-Ming Kuo
  • Oxidized cellulose and vitamin E blend for topical hemostatic applications
    Patent number: 5696101
    Abstract: The present invention relates to a hemostatic composition comprising 1 to 90 weight percent of vitamin E or a derivative of vitamin E, 1 to 95 weight percent of oxidized cellulose, and 0.1 to 75 weight percent of water. The hemostatic composition may be formed into pellets, powder, paste, gum, gel, or liquid suitable for molding to conform to the contours of a wound.
    Type: Grant
    Filed: April 16, 1996
    Date of Patent: December 9, 1997
    Assignee: Eastman Chemical Company
    Inventors: Stephen Hong-Wei Wu, Warren Kent Hopkins