Patents by Inventor Chitrangad

Chitrangad 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).

  • HIGH LINEAR DENSITY, HIGH MODULUS, HIGH TENACITY YARNS AND METHODS FOR MAKING THE YARNS
    Publication number: 20130157054
    Abstract: The present invention relates to a yarn, comprising (a) a plurality of fibers having an orientation angle of no more than 8.0 degrees and made of a para-aramid, (b) a linear density of at least 2666 dtex (2400 denier), (c) a modulus of at least 810 grams per dtex (900 grams per denier), and (d) a tenacity of at least 18 grams per dtex (20 grams per denier). The invention further relates to methods of making such yarn.
    Type: Application
    Filed: December 20, 2011
    Publication date: June 20, 2013
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventor: Bhatnagar Chitrangad
  • FLAME-RESISTANT FINISH FOR INHERENTLY FLAME RESISTANT POLYMER YARNS AND PROCESS FOR MAKING SAME
    Publication number: 20130029151
    Abstract: A synthetic fiber yarn and process for providing same, the yarn comprising a plurality of fibers of inherently flame resistant polymer having a surface finish of perfluorinated alkyl ether oil, wherein the perfluorinated alkyl ether has a molecular weight of from 1000 to 4730 and the yarn has a char length when burned of 6 cm or less.
    Type: Application
    Filed: January 31, 2012
    Publication date: January 31, 2013
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Teresa C. Madeleine, Bhatnagar Chitrangad
  • High linear density, high modulus, high tenacity yarns and methods for making the yarns
    Patent number: 7976943
    Abstract: The present invention relates to a yarn, comprising (a) a plurality of fibers having an orientation angle of no more than 8.0 degrees and made of a para-aramid having an inherent viscosity of 5.2 to 6.2 dl/g, (b) a linear density of at least 2666 dtex (2400 denier), (c) a modulus of at least 810 grams per dtex (900 grams per denier), and (d) a tenacity of at least 18 grams per dtex (20 grams per denier). The invention further relates to methods of making such yarn.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: July 12, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Bhatnagar Chitrangad
  • High linear density, high modulus, high tenacity yarns and methods for making the yarns
    Publication number: 20090092830
    Abstract: The present invention relates to a yarn, comprising (a) a plurality of fibers having an orientation angle of no more than 8.0 degrees and made of a para-aramid having an inherent viscosity of 5.2 to 6.2 dl/g, (b) a linear density of at least 2666 dtex (2400 denier), (c) a modulus of at least 810 grams per dtex (900 grams per denier), and (d) a tenacity of at least 18 grams per dtex (20 grams per denier). The invention further relates to methods of making such yarn.
    Type: Application
    Filed: October 9, 2007
    Publication date: April 9, 2009
    Inventor: Bhatnagar Chitrangad
  • Continuous processes for making composite fibers
    Publication number: 20060113700
    Abstract: The present invention relates to continuous processes for making composite fibers from aramid polymers. The processes produce fibers that are useful in a variety of applications, including reinforcing elastomeric materials.
    Type: Application
    Filed: December 1, 2004
    Publication date: June 1, 2006
    Inventors: Jon Hartzler, Bhatnagar Chitrangad
  • Aramid ballistic structure
    Patent number: 6030683
    Abstract: An aramid ballistic protection construction is disclosed with a combination of woven para-aramid fiber sheets and compressed pulp sheets. The construction exhibits improved wearer comfort and increased flexibility, with a level of ballistics protection nearly equal to that provided by an equivalent areal density of woven sheets, alone.
    Type: Grant
    Filed: April 23, 1996
    Date of Patent: February 29, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Chitrangad
  • Ballistic structure
    Patent number: 5275873
    Abstract: An improved ballistic structure is disclosed wherein aramid filaments of the structure are maintained under tension.
    Type: Grant
    Filed: December 10, 1992
    Date of Patent: January 4, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Chitrangad
  • Fluorinated finishes for aramids
    Patent number: 5266076
    Abstract: A method for modifying the surface properties of aramids by coating aramid fibers with certain fluorinated compounds containing polar nitrogen groups. Also disclosed are the fibers and fabrics produced by this process, and their use in ballistic applications.
    Type: Grant
    Filed: January 24, 1992
    Date of Patent: November 30, 1993
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Chitrangad, Jose M. Rodriguez-Parada
  • Hybrid ballistic fabric
    Patent number: 5187003
    Abstract: A woven fabric for ballistic protection is disclosed wherein the fibers in the fill direction exhibit an elongation to break greater than the elongation to break of the fibers in the warp direction.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: February 16, 1993
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Chitrangad