Patents by Inventor Ramesh Keshavaraj

Ramesh Keshavaraj 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).

  • Patent number: 7951437
    Abstract: An inflatable automotive protective cushion and method of formation. The protective cushion includes a multilayer film coating with an adhesive layer and an overlying barrier layer. The adhesive layer is adapted to bond to a textile substrate and the barrier layer is adapted to block air permeability.
    Type: Grant
    Filed: September 22, 2006
    Date of Patent: May 31, 2011
    Assignee: Milliken & Company
    Inventors: Ramesh Keshavaraj, Dany F. Michiels
  • Patent number: 7772141
    Abstract: An airbag fabric has a finish on a surface thereof, the finish comprising a plurality of particles having a diameter of about 20 ?m or less. A process for producing a coated airbag fabric comprises the steps of (a) providing an airbag fabric, (b) contacting at least one surface of the airbag fabric with a coating composition comprising a plurality of particles having a diameter of about 20 ?m or less, and (c) drying the fabric treated in step (b) to produce a finish on the airbag fabric.
    Type: Grant
    Filed: November 28, 2006
    Date of Patent: August 10, 2010
    Assignee: Milliken & Company
    Inventors: Yunzhang Wang, Ramesh Keshavaraj
  • Patent number: 7736701
    Abstract: Provided herein are specific coating compositions, which are used as a monolithic coating layer for airbags. Preferably, these coating compositions are comprised of urethanes, which are blended together, where at least one of the urethane components is inherently flame retardant and the other of which is a urethane with gas-retaining properties. The gas-retaining urethane may be characterized as having high tensile strength at break, high elongation at break, and a 100% modulus less than 2,000 p.s.i. The inherently flame retardant urethane is the result of a manufacturing process in which a halogenated diol is reacted with an isocyanate, resulting in the incorporation of halogens into the polyurethane backbone. The resulting coating compositions (that is, the blends of gas-retaining urethane and flame retardant urethane), when applied as a single layer to an airbag fabric, result in an airbag with good gas retention, flame retardance, anti-blocking properties, and aging stability.
    Type: Grant
    Filed: October 20, 2009
    Date of Patent: June 15, 2010
    Assignee: Milliken & Company
    Inventors: Ramesh Keshavaraj, Kunquan Yu
  • Patent number: 7737058
    Abstract: Provided herein are specific coating compositions, which are used as a monolithic coating layer for airbags. Preferably, these coating compositions are comprised of urethanes, which are blended together, where at least one of the urethane components is inherently flame retardant and the other of which is a urethane with gas-retaining properties. The gas-retaining urethane may be characterized as having high tensile strength at break, high elongation at break, and a 100% modulus less than 2,000 p.s.i. The inherently flame retardant urethane is the result of a manufacturing process in which a halogenated diol is reacted with an isocyanate, resulting in the incorporation of halogens into the polyurethane backbone. The resulting coating compositions (that is, the blends of gas-retaining urethane and flame retardant urethane), when applied as a single layer to an airbag fabric, result in an airbag with good gas retention, flame retardance, anti-blocking properties, and aging stability.
    Type: Grant
    Filed: January 23, 2008
    Date of Patent: June 15, 2010
    Assignee: Milliken & Company
    Inventors: Ramesh Keshavaraj, Kunquan Yu
  • Patent number: 7736702
    Abstract: Coating compositions, which are used as a monolithic coating layer for airbags. The coating compositions include a combination of urethanes which are blended together. At least one of the urethane components provides gas-retaining properties and the other provides the aging stability. The gas-retaining urethane may be characterized as having high tensile strength at break, high elongation at break, and a 100% modulus less than 1,200 psi. The aging stability urethane has a polycarbonate backbone as result of a manufacturing process in which a polycarbonate diol is reacted with an isocyanate. The resulting coating compositions, when applied as a single layer to an airbag fabric, result in an airbag with good gas retention and aging stability.
    Type: Grant
    Filed: October 20, 2009
    Date of Patent: June 15, 2010
    Assignee: Milliken & Company
    Inventor: Ramesh Keshavaraj
  • Patent number: 7737059
    Abstract: Coating compositions, which are used as a monolithic coating layer for airbags. The coating compositions include a combination of urethanes which are blended together. At least one of the urethane components provides gas-retaining properties and the other provides the aging stability. The gas-retaining urethane may be characterized as having high tensile strength at break, high elongation at break, and a 100% modulus less than 1,200 psi. The aging stability urethane has a polycarbonate backbone as result of a manufacturing process in which a polycarbonate diol is reacted with an isocyanate. The resulting coating compositions, when applied as a single layer to an airbag fabric, result in an airbag with good gas retention and aging stability.
    Type: Grant
    Filed: February 19, 2009
    Date of Patent: June 15, 2010
    Assignee: Milliken & Company
    Inventor: Ramesh Keshavaraj
  • Patent number: 7686331
    Abstract: This invention relates generally to abrasion resistant and/or puncture resistant fabrics, coated, layered and/or laminated inflatable fabrics, and methods. More particularly, it concerns airbag cushions to which films, fabrics, layers, and/or coatings have been applied and which exhibit enhanced abrasion resistance and/or puncture resistance. The inventive inflatable fabrics are especially suited for use in automotive restraint cushions that require abrasion resistance and/or puncture resistance (such as side curtain airbags).
    Type: Grant
    Filed: September 27, 2004
    Date of Patent: March 30, 2010
    Assignee: Milliken & Company
    Inventors: Shulong Li, Derek L. Bowen, Charles E. Willbanks, Ramesh Keshavaraj, David D. Hildreth
  • Publication number: 20100040792
    Abstract: Provided herein are specific coating compositions, which are used as a monolithic coating layer for airbags. Preferably, these coating compositions are comprised of urethanes, which are blended together, where at least one of the urethane components is inherently flame retardant and the other of which is a urethane with gas-retaining properties. The gas-retaining urethane may be characterized as having high tensile strength at break, high elongation at break, and a 100% modulus less than 2,000 p.s.i. The inherently flame retardant urethane is the result of a manufacturing process in which a halogenated diol is reacted with an isocyanate, resulting in the incorporation of halogens into the polyurethane backbone. The resulting coating compositions (that is, the blends of gas-retaining urethane and flame retardant urethane), when applied as a single layer to an airbag fabric, result in an airbag with good gas retention, flame retardance, anti-blocking properties, and aging stability.
    Type: Application
    Filed: October 20, 2009
    Publication date: February 18, 2010
    Inventors: Ramesh Keshavaraj, Kunquan Yu
  • Publication number: 20090297723
    Abstract: A side curtain air bag treated with a film forming polyurethane coating that reduces the propensity for seam combing while simultaneously blocking permeability outboard of the seams to a sufficient degree to provide gas retention over an extended period of time following pressurization.
    Type: Application
    Filed: August 10, 2009
    Publication date: December 3, 2009
    Inventors: Ramesh Keshavaraj, Dany Felix Maria Michiels
  • Publication number: 20090289444
    Abstract: An inflatable passenger restraint airbag having an inflatable and transferable gas vent is disclosed. A system and method is provided whereby the force of airbag deployment may be reduced in real time if the airbag strikes an out of position seat occupant. This force reduction is made possible by release of inflation gas at an early stage of deployment through an adjustable gas vent. This gas vent is operable between an open venting position and a closed non-venting position. Whether or not the transfer of the vent occurs in a given deployment situation is determined by the presence or absence of an out of position obstruction in the pathway of the airbag.
    Type: Application
    Filed: May 20, 2008
    Publication date: November 26, 2009
    Inventor: Ramesh Keshavaraj
  • Publication number: 20090186543
    Abstract: Provided herein are specific coating compositions, which are used as a monolithic coating layer for airbags. Preferably, these coating compositions are comprised of urethanes, which are blended together, where at least one of the urethane components is inherently flame retardant and the other of which is a urethane with gas-retaining properties. The gas-retaining urethane may be characterized as having high tensile strength at break, high elongation at break, and a 100% modulus less than 2,000 p.s.i. The inherently flame retardant urethane is the result of a manufacturing process in which a halogenated diol is reacted with an isocyanate, resulting in the incorporation of halogens into the polyurethane backbone. The resulting coating compositions (that is, the blends of gas-retaining urethane and flame retardant urethane), when applied as a single layer to an airbag fabric, result in an airbag with good gas retention, flame retardance, anti-blocking properties, and aging stability.
    Type: Application
    Filed: January 23, 2008
    Publication date: July 23, 2009
    Inventors: Ramesh Keshavaraj, Kunquan Yu
  • Patent number: 7549669
    Abstract: An air bag curtain that incorporates at least a pair of substantially discrete inflation zones within the curtain structure such that upon failure or disengagement of one inflation zone, at least one other inflation zone remains operative.
    Type: Grant
    Filed: May 27, 2005
    Date of Patent: June 23, 2009
    Assignee: Milliken & Company
    Inventor: Ramesh Keshavaraj
  • Patent number: 7543843
    Abstract: The present disclosure is directed to the use of specific hybrid resins as airbag coatings. Preferably, the polymers used to create these hybrid resins, as described herein, are urethanes blended with acrylates, vinyls, silicones, and combinations thereof, where at least one of the components has a glass transition temperature of 20° C. or less. The urethanes are preferably of the polycarbonate, polytetramethyleneglycol, silicon-based diol, or olefin-based diol type. The hybrid resins may be produced in an aqueous dispersion, in a solvent, or by mixing the polymers together where one polymer is dissolved directly into a second polymer to form a continuous matrix. The resulting hybrid resins exhibit a tensile strength of at least 1,000 p.s.i. and an elongation at break of at least about 200%.
    Type: Grant
    Filed: August 10, 2006
    Date of Patent: June 9, 2009
    Assignee: Milliken & Company
    Inventors: Ramesh Keshavaraj, Shulong Li
  • Patent number: 7461861
    Abstract: A profile tuner panel that adjusts an air bag profile for top mounted or ¾ mounted cushions and causes the air bags to have enough rotation around an instrumental panel. The profile tuner panel is a section of fabric that is used to form at least part of the mouth section of the airbag cushion in the desired position with respect to the cushion, the module, and the frame of the car, and is also used to rotate and orient the cushion properly upon deployment.
    Type: Grant
    Filed: July 22, 2002
    Date of Patent: December 9, 2008
    Inventor: Ramesh Keshavaraj
  • Patent number: 7413214
    Abstract: An airbag cushion having a novel seam structure including either a tri-stitch fold-over seam structure or a double-stitch fold-over seam structure. The novel seam structure allows airbag cushions to be manufactured by using low tenacity yarns, preferably in the range of between about 40 cN/tex and about 65 cN/tex.
    Type: Grant
    Filed: January 8, 2002
    Date of Patent: August 19, 2008
    Assignee: Milliken & Company
    Inventors: Ramesh Keshavaraj, Michael D. Hurst, William J. Martin
  • Patent number: 7393011
    Abstract: An airbag assembly including one or more elongate tether elements that extend through vent openings along travel paths from anchoring locations such that the tether elements extend in sliding relation through the vent openings. The gas emission capacity of the vent openings may be adjustable based on internal cushion pressure.
    Type: Grant
    Filed: February 24, 2006
    Date of Patent: July 1, 2008
    Assignee: Milliken & Company
    Inventor: Ramesh Keshavaraj
  • Patent number: 7371445
    Abstract: The present invention relates to an airbag cushion which exhibits a low amount of seam usage (in order to attach at least two fabric panels or portions of a panel together) in correlation to an overall high amount of available inflation airspace within the cushion itself. These correlated elements are now combined for the first time in what is defined as an effective seam usage index (being the quotient of the length of overall seams on the cushions and the available inflation airspace volume). The inventive cushion must have at least one substantially straight seam and must possess an effective seam usage factor of less than about 0.11. A cushion exhibiting such a low seam usage factor and also comprising an integrated looped pocket for the disposition of an inflator can is also provided as well as an overall vehicle restraint system comprising the inventive airbag cushion.
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: May 13, 2008
    Assignee: Milliken & Company
    Inventor: Ramesh Keshavaraj
  • Patent number: 7353669
    Abstract: An air bag substrate fabric utilizing a tying yarn knitting arrangement wherein a portion of the tying yarns are threaded to engage needles so as to form two stitches with one on either side of the inlay warp yarn at rows of stitch formation. The neighboring stitches resist yarn separation and resultant combing while also blocking the commencement and propagation of de-knitting when a tying yarn is broken.
    Type: Grant
    Filed: November 19, 2004
    Date of Patent: April 8, 2008
    Assignee: Milliken & Company
    Inventors: Gerard Ternon, Ramesh Keshavaraj
  • Patent number: 7354063
    Abstract: An airbag construction for a vehicle is described. The construction utilizes non-circular polygon shaped panels, which provide greater nesting efficiency than previously achieved by comparable airbags using round panels. In addition, the construction enables the airbag to take full advantage of the strength of the yarns forming the fabric, and the energy absorption of the fabric construction, enabling the use of lower tenacity yarns and/or materials at comparable levels of performance.
    Type: Grant
    Filed: March 9, 2004
    Date of Patent: April 8, 2008
    Assignee: Milliken & Company
    Inventor: Ramesh Keshavaraj
  • Patent number: RE42458
    Abstract: The present invention relates to an airbag fabric which is woven in such a manner as to possess a cover factor of less than about 1900 but which simultaneously, through the presence of a film (laminate) or coating, possesses an extremely low air permeability. The utilization of such a loosely constructed fabric within airbag cushions has heretofore not been possible, even with the application of standard airbag coatings (such as silicones) over the fabric surface since such coatings with not easily remain in contact over the loosely constructed fabric surface (i.e., the coating would leak through the fabric). The coupling of a low cover factor fabric with a laminate film (or with a coating wherein the cover factor is at least 1600), however, solves such a problem and permits the utilization of inexpensively produced woven fabrics within airbag applications.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: June 14, 2011
    Assignee: Milliken & Company
    Inventor: Ramesh Keshavaraj