Patents by Inventor Toan-Hieu Giang

Toan-Hieu Giang 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).

  • Electret filter element and method for the manufacture thereof
    Patent number: 8871011
    Abstract: A method for manufacturing an electret filter element includes preparing fibers and producing, by a spray device, a spray mist of fluid droplets which include an electrical charge formed by an electric field between detaching fluid droplets and a counter-electrode. The fibers are passed through the spray mist so as to wet the fibers with the fluid droplets. The fibers are laid down to form a fibrous layer.
    Type: Grant
    Filed: August 27, 2009
    Date of Patent: October 28, 2014
    Assignee: Carl Freudenberg KG
    Inventors: Klaus Veeser, Martin Krause, Toan-Hieu Giang, Jochen Zabold
  • Layer for use in a HEPA filter element
    Patent number: 8709139
    Abstract: A layer for use in a HEPA filter element solves the problem of disclosing a filter element which satisfies HEPA requirements. Said layer comprises a first support layer (1) for stabilization which contains polypropylene fibers, and a second deposition layer (2) which contains polypropylene fibers, wherein the polypropylene fibers of the deposition layer (2) are at least partially electrostatically charged, and wherein the support layer (1) and the deposition layer (2) are constructed as nonwoven material which is at least partially free of glass fiber. The layer according to the invention can be easily pleated while having excellent filter efficiency.
    Type: Grant
    Filed: December 3, 2007
    Date of Patent: April 29, 2014
    Assignee: Carl Freudenberg KG
    Inventors: Klauss Veeser, Armin Greiner, Harold Von Schischka, Juergen Adolph, Toan-Hieu Giang
  • ELECTRET FILTER ELEMENT AND METHOD FOR THE PRODUCTION THEREOF
    Publication number: 20110168024
    Abstract: A method for manufacturing an electret filter element includes preparing fibers and producing, by a spray device, a spray mist of fluid droplets which include an electrical charge formed by an electric field between detaching fluid droplets and a counter-electrode. The fibers are passed through the spray mist so as to wet the fibers with the fluid droplets. The fibers are laid down to form a fibrous layer.
    Type: Application
    Filed: August 27, 2009
    Publication date: July 14, 2011
    Applicant: CARL FREUDENBERG KG
    Inventors: Klaus Veeser, Martin Krause, Toan-Hieu Giang, Jochen Zabold
  • LAYER FOR USE IN A HEPA FILTER ELEMENT
    Publication number: 20100101199
    Abstract: A layer for use in a HEPA filter element solves the problem of disclosing a filter element which satisfies HEPA requirements. Said layer comprises a first support layer (1) for stabilization which contains polypropylene fibers, and a second deposition layer (2) which contains polypropylene fibers, wherein the polypropylene fibers of the deposition layer (2) are at least partially electrostatically charged, and wherein the support layer (1) and the deposition layer (2) are constructed as nonwoven material which is at least partially free of glass fiber. The layer according to the invention can be easily pleated while having excellent filter efficiency.
    Type: Application
    Filed: December 3, 2007
    Publication date: April 29, 2010
    Applicant: CARL FREUDENBERG KG
    Inventors: Klauss Veeser, Armin Greiner, Harold Von Schischka, Juergen Adolph, Toan-Hieu Giang