Patents by Inventor Seshadri S. Ramkumar

Seshadri S. Ramkumar 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: 7516525
    Abstract: A process for making chemical protective wipes is disclosed. A top layer is fully needlepunched (102). A bottom layer is fully needlepunched (104). Then, an adsorption layer is sandwiched between the top layer and the bottom layer (106). Then, the sandwich is fully needlepunched (108).
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: April 14, 2009
    Assignee: Texas Tech University
    Inventor: Seshadri S. Ramkumar
  • Patent number: 6862971
    Abstract: A ballistic protection composite shield is disclosed, with improved next-to-skin properties, and improved flexibility. Needlepunching technology permits the manufacture of the wear layer using any type of fiber, and advantageously allows distinct layering, fiber blending, compressibility, controlled fiber orientation, and increases z-directional strength. Needlepunching the nonwoven wear layer to the woven antiballistic layer mechanically interconnects the two layers, eliminating the need for an adhesive bond and increasing the flexibility of the shield. An abrasion resistant strike layer, such as leather, increases the life of the shield.
    Type: Grant
    Filed: December 17, 2002
    Date of Patent: March 8, 2005
    Assignee: Texas Tech University
    Inventor: Seshadri S. Ramkumar
  • Publication number: 20040112206
    Abstract: A ballistic protection composite shield is disclosed, with improved next-to-skin properties, and improved flexibility. Needlepunching technology permits the manufacture of the wear layer using any type of fiber, and advantageously allows distinct layering, fiber blending, compressibility, controlled fiber orientation, and increases z-directional strength. Needlepunching the nonwoven wear layer to the woven antiballistic layer mechanically interconnects the two layers, eliminating the need for an adhesive bond and increasing the flexibility of the shield. An abrasion resistant strike layer, such as leather, increases the life of the shield.
    Type: Application
    Filed: December 17, 2002
    Publication date: June 17, 2004
    Inventor: Seshadri S. Ramkumar
  • Publication number: 20030236047
    Abstract: A method of producing a chemical protective composite substrate by embedding chemical adsorbent layer between two nonwoven needlepunched substrates. The substrate in woven form is sandwiched between two needlepunched nonwoven mats. The nonwoven mats, in the preferred embodiment, are made from apparel grade polyester fibers of 1.5″ length and 1.5 denier, using H1 technology needlepunching machinery. A woven activated carbon cloth is sandwiched between two nonwoven substrates. The nonwoven substrates are double punched at a speed of 800 strokes/min. The three layers are fed to the conveyor belt that feeds the needleloom. The three-layer sandwich passes through the needling zone and gets compacted into a composite substrate. The three layers are needlepunched at 800 strokes/min resulting in a needle composite structure that has: a top or prefilter nonwoven layer; a middle or adsorbent layer and a bottom or base nonwoven layer.
    Type: Application
    Filed: September 5, 2002
    Publication date: December 25, 2003
    Applicant: Texas Tech University
    Inventor: Seshadri S. Ramkumar