Patents by Inventor Mithun A. Shah

Mithun A. Shah 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).

  • Method of making glazed nonwoven fabric
    Patent number: 9290877
    Abstract: A glazing method for improving abrasion resistance using a heated smooth roll to melt the lower-melting-point portion of bicomponent fibers as the spunbond web passes over the heated smooth roll. Because there is no external pressure exerted in a nip by an opposing second roller, as in calendering, the outer surface of the web which does not contact the heated smooth roll remains essentially unchanged and the nonwoven fabric exhibits no compression as a result of the glazing process. The roll temperature and dwell time (roll diameter, wrap angle and line speed) are controlled for the purpose of surface treating only one side of the nonwoven fabric to improve abrasion resistance while allowing the air permeability and web thickness to remain essentially unchanged.
    Type: Grant
    Filed: May 23, 2013
    Date of Patent: March 22, 2016
    Assignee: Ahlstrom Corporation
    Inventors: Mithun A. Shah, Rongguo Zhao
  • GLAZED NONWOVEN FABRIC AND METHODS OF MANUFACTURE
    Publication number: 20150159308
    Abstract: A glazing method for improving abrasion resistance using a heated smooth roll to melt the lower-melting-point portion of bicomponent fibers as the spunbond web passes over the heated smooth roll. Because there is no external pressure exerted in a nip by an opposing second roller, as in calendering, the outer surface of the web which does not contact the heated smooth roll remains essentially unchanged and the nonwoven fabric exhibits no compression as a result of the glazing process. The roll temperature and dwell time (roll diameter, wrap angle and line speed) are controlled for the purpose of surface treating only one side of the nonwoven fabric to improve abrasion resistance while allowing the air permeability and web thickness to remain essentially unchanged.
    Type: Application
    Filed: May 23, 2013
    Publication date: June 11, 2015
    Inventors: Mithun A. Shah, Rongguo Zhao
  • Glazed Nonwoven Fabric and Methods of Manufacture
    Publication number: 20130337714
    Abstract: A glazing method for improving abrasion resistance using a heated smooth roll to melt the lower-melting-point portion of bicomponent fibers as the spunbond web passes over the heated smooth roll. Because there is no external pressure exerted in a nip by an opposing second roller, as in calendering, the outer surface of the web which does not contact the heated smooth roll remains essentially unchanged and the nonwoven fabric exhibits no compression as a result of the glazing process. The roll temperature and dwell time (roll diameter, wrap angle and line speed) are controlled for the purpose of surface treating only one side of the nonwoven fabric to improve abrasion resistance while allowing the air permeability and web thickness to remain essentially unchanged.
    Type: Application
    Filed: June 13, 2012
    Publication date: December 19, 2013
    Applicant: AHLSTROM COPORATION
    Inventors: Mithun A. Shah, Rongguo Zhao