Patents by Inventor Qiwei He

Qiwei He 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).

  • Low application temperature elastic attachment adhesive
    Publication number: 20050176867
    Abstract: Low application temperature thermoplastic hot melt adhesives are particularly useful as elastic attachment adhesives. The adhesives have a viscosity at 275° F. of less than about 8,000 cp, a yield stress of less than about than 80 psi and a creep performance for a bond made through strand coating of less than about 15%. Preferred are adhesives that have a creep performance for a bond made through spiral coating of less than about 25%.
    Type: Application
    Filed: February 6, 2004
    Publication date: August 11, 2005
    Inventors: Qiwei He, Michael Harwell, Ju-ming Hung, Martin Riswick, Wei Kong, Kenneth Martin, Tahir Iqbal
  • Low application temperature hot melt adhesive
    Publication number: 20040077240
    Abstract: A low application temperature rubber-based hot melt adhesive having properties particularly well suited for use in the construction of disposable articles has been invented. The adhesive comprises a styrene block copolymer and a type of wax in an amount effective to produce a viscosity at 120° C. of below about 10,000 centipoises, a cube flow at 130° F. (54° C.) of less than about 300%, a DSC crystallization temperature of less than about 75° C. and a storage modulus of less than about 1.0×107 dynes/cm2 at 10 rads/sec (25° C.).
    Type: Application
    Filed: October 18, 2002
    Publication date: April 22, 2004
    Inventors: Charles W. Paul, Matthew L. Sharak, Leisa A. Ryan, Maria Xenidou, Michael G. Harwell, Qiwei He
  • Polycarbonate isolation through homogenization devolatization
    Patent number: 6489372
    Abstract: Polymer are removed from organic solvent-polymer mixtures by preparing a liquid-liquid dispersion of finely dispersed solvent droplets containing polymer in water, adding this liquid-liquid dispersion to a stirred vessel containing water or other suitable liquid and rapidly evaporating the solvent to produce a slurry of the polymer in a liquid from which the solid polymer particles are recovered.
    Type: Grant
    Filed: October 17, 2000
    Date of Patent: December 3, 2002
    Assignee: General Electric Company
    Inventors: Qiwei He, Paul Russell Wilson, Paul William Buckley, Allen Wai Yee Ko, Larry Allen Divins, William Lee Gately, Ganesh Kailasam
  • Polycarbonate isolation through homogenization devolatization
    Patent number: 6214892
    Abstract: This invention relates to a method of recovering a polymer from an organic mixture comprising polymer and an organic solvent, the method comprising: a) admixing an aqueous solution and the organic mixture by the application of a combined mechanical and hydraulic shear force, the combined mechanical and shear force being sufficient to form a liquid-liquid dispersion; b) removing the organic solvent from the liquid-liquid dispersion thereby forming a remaining solution; and c) separating the polymer from the remaining solution. In one embodiment the polymer is a polycarbonate prepared by the interfacial method, and the organic solvent is methylene chloride.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: April 10, 2001
    Assignee: General Electric Company
    Inventors: Qiwei He, Paul Russell Wilson, Paul William Buckley, Allen Wai Yee Ko, Larry Allen Divins