Patents by Inventor Rajen Patel

Rajen Patel 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: 11104620
    Abstract: A method for manufacturing nano-sized insensitive high explosive molding powder usable as a booster HE is provided herein. The method preferably involving the steps of dissolving a binder in a liquid and suspending crystalline high explosive to said liquid, grinding that suspension in a bead mill until the crystalline high explosive is nano-sized, and precipitating the binder and crystalline high explosive using a spray dryer to produce granules containing nano-sized crystalline high explosive. The liquid may be water or an organic solvent so long as the binder is highly soluble in the liquid and the crystalline high explosive is generally insoluble in the liquid. A fatty alcohol, water defoaming/dispersant/surfactant agent can be added to the dissolved binder/suspended crystalline high explosive, to aid in the manufacturability.
    Type: Grant
    Filed: May 10, 2017
    Date of Patent: August 31, 2021
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Rajen Patel, Victor Stepanov, Ashok Surapaneni, Anthony DiStasio, Hongwei Qiu
  • Patent number: 10974869
    Abstract: A method of producing flexible polypropylene fabric bags with heat fused seams comprising providing fabric pieces, wherein each fabric piece has a coated side and an uncoated side; positioning fabric pieces so that a coated side of one fabric piece faces a coated side of another fabric piece; selecting an area of fabric to be joined for forming a seam or joint; applying heat to the area to be joined that is less than the melting point of the fabrics, for forming one or more seams or joints and wherein the heat fused seams or joints of a resulting polypropylene bag retains at least 85% of the fabric strength without using sewing machines.
    Type: Grant
    Filed: September 10, 2018
    Date of Patent: April 13, 2021
    Inventors: Clifford Dunlap, Daniel R. Schnaars, Sr., Lori Kardos, Rajen Patel
  • Patent number: 10703687
    Abstract: Stabilized, amorphous high energetic compositions having crystallization inhibiting polymers dispersed throughout the solid composition. The compositions disclosed herein are an improvement over crystalline high energetic compositions in that such disclosed compositions are stable and possess physical properties desirable in propellant and high explosive applications.
    Type: Grant
    Filed: November 20, 2017
    Date of Patent: July 7, 2020
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Victor Stepanov, Rajen Patel, Chris Pizzo, Alexander Paraskos, Ruslan Mudryy, Hongwei Qiu
  • Patent number: 9850181
    Abstract: A single-step method for preparing nano-sized cocrystals of explosive material by preparing a coformer solution having an explosive precursor dissolved into a liquid medium and a second explosive precursor dispersed in the liquid medium. The viscosity and solubility of the coformer solution may be modified by addition of binders, plasticizers, surfactants and anti-foaming agents to the coformer solution. The coformer solution is then milled to mechanically form the cocrystals. Further milling produces the desired cocrystal sizes.
    Type: Grant
    Filed: June 8, 2017
    Date of Patent: December 26, 2017
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Rajen Patel, Victor Stepanov, Reddy Damavarapu, Hongwei Qui
  • Patent number: 9790137
    Abstract: A method of manufacturing a CL-20/HMX cocrystalline explosive which is coated in a polymeric binder, so as to be useful as an explosive molding powder. The cocrystalline material having a desirable average crystal size of from about 300 nm to about 1000 nm, which crystals are intimately coated with a polymeric binder and are produced as granular agglomerates that are less than on average 5 microns in size, and which crystals are relatively easy and safe to handle, transport, store and use. The method involving spray drying a CL-20 and HMX solvent solution containing a polymeric binder to form an intermediary amorphous material—which intermediary is then heated to cocrystallize the CL-20/HMX into the desired size cocrystals and aggregates thereof—which are coated in said polymeric binder.
    Type: Grant
    Filed: June 8, 2015
    Date of Patent: October 17, 2017
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Victor Stepanov, Reddy Damavarapu, Rajen Patel, Hongwei Qiu
  • Publication number: 20150151517
    Abstract: The invention provides a film comprising at least two layers, a first layer and a second layer; and wherein the first layer is formed from a first composition comprising a polyester, a polylactic acid, or a combination thereof; and wherein the second layer is formed from a second composition comprising at least the following: A) functionalized ethylene-based polymer, and B) ethylene/alpha-olefin interpolymer; and wherein the first layer is adjacent to the second layer.
    Type: Application
    Filed: March 5, 2013
    Publication date: June 4, 2015
    Applicants: Dow Brasil SA, Dow Global Technologies LLC
    Inventors: Didem Oner-Deliormanli, Marlos Giuntini de Oliveira, Ashish Batra, Rajen Patel, Brian Walther
  • Patent number: 8911575
    Abstract: Moldable explosives containing chlorinated and/or fluorinated oils and waxes are described which exhibit significant energetic characteristics while at the same time possessing desirable IM character. Such moldable explosives are potential replacements for the C4 compositions known and used in the art.
    Type: Grant
    Filed: September 27, 2011
    Date of Patent: December 16, 2014
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Anthony R. Di Stasio, Sanjeev K. Singh, Daniel Zaloga, Rajen Patel
  • Publication number: 20140360669
    Abstract: A method of joining highly oriented polypropylene woven fabrics by the steps of coating the fabrics with materials that have a melting point that is lower than the melting point of the polypropylene fabrics to be joined together; heating the coating to its lower melting point; and joining the heated materials with pressure light enough to allow the coating to stay in place and generally not allowing the woven fabrics to touch.
    Type: Application
    Filed: June 5, 2014
    Publication date: December 11, 2014
    Inventors: Daniel R. SCHNAARS, SR., Clifford DUNLAP, Lori KARDOS, Rajen PATEL
  • Patent number: 8707764
    Abstract: A test assembly for building a safety profile and a sensitivity profile of an explosive, by impacting the test assembly with a projectile. The safety profile of the explosive is built by determining a detonation threshold of the explosive in reaction to the projectile. The sensitivity profile is built by measuring a pressure difference between pressures acquired by the top sensor and the bottom sensor, resulting from a shock wave that travels through the explosive.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: April 29, 2014
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Anthony Di Stasio, Barry Fishburn, Sanjeev Singh, Rajen Patel, Eugene Homentowski
  • Patent number: 8092920
    Abstract: A multi-layer heat film having at least three layers is disclosed wherein the film has high optical properties, high stiffness and desirable shrinkage in the cross direction. The inner layer, or layers, comprises at least one stiffening polymer selected from the group consisting of: low density polyethylene, linear low density polyethylene, high density polyethylene, blends thereof, polypropylene random copolymer, styrene/butadiene copolymer, polystyrene/butadiene copolymer, polystyrene, ethylene-vinyl acetate copolymer and cyclic-olefin copolymer, provided that when more than one inner layer is present, the inner layers can be the same or different.
    Type: Grant
    Filed: August 14, 2003
    Date of Patent: January 10, 2012
    Assignee: Dow Global Technologies LLC
    Inventors: Jose V. Saavedra, Rajen Patel, Varun Ratta
  • Publication number: 20090264584
    Abstract: An improved process for crosslinking a polyolefin polymer is described. The process involves grafting a silane material onto the polyolefin based polymer in the presence of a free radical generating initiator material and then hydrolyzing the silane material to form crosslinks. By using an effective molar ratio of silane material to free radical of 40 or greater in the grafting reaction, premature crosslinking is controlled and the grafted polymer can be shaped first and then crosslinked. In another aspect of the invention, the crosslinking process is improved by adding a catalyst for the hydrolysis catalyst to the surface of a shaped article made from the grafted polymer. Grafted polymer and articles made from the grafted polymer, particularly fibers, are also disclosed.
    Type: Application
    Filed: June 10, 2009
    Publication date: October 22, 2009
    Applicant: Dow Global Technologies Inc.
    Inventors: Parvinder Walia, Rajen Patel, John Klier, John D. Weaver, Mladen Ladika, Jeffrey M. Cogen, Mohammed Esseghir
  • Publication number: 20080078445
    Abstract: An electronic device module comprising: A. At least one electronic device, e.g., a solar cell, and B. A polymeric material in intimate contact with at least one surface of the electronic device, the polymeric material comprising (1) a polyolefin copolymer with at least one of (a) a density of less than about 0.90 g/cc, (b) a 2% secant modulus of less than about 150 megaPascal (mPa) as measured by ASTM D-882-02), (c) a melt point of less than about 95 C, (d) an ?-olefin content of at least about 15 and less than about 50 wt % based on the weight of the polymer, (e) a Tg of less than about ?35 C, and (f) a SCBDI of at least about 50, (2) optionally, free radical initiator, e.g., a peroxide or azo compound, or a photoinitiator, e.g., benzophenone, and (3) optionally, a co-agent. Typically, the polyolefin copolymer is an ethylene/?-olefin copolymer. Optionally, the polymeric material can further comprise a vinyl silane and/or a scorch inhibitor, and the copolymer can remain uncrosslinked or be crosslinked.
    Type: Application
    Filed: September 18, 2007
    Publication date: April 3, 2008
    Inventors: Rajen Patel, Shaofu Wu, Mark Bernius, Mohamed Esseghir, Robert McGee, Michael Mazor, John Naumovitz
  • Publication number: 20070275219
    Abstract: The present invention relates to compositions and processes of making and using interpolymers having a controlled molecular weight distribution. Multilayer films and film layers derived from novel ethylene/?-olefin interpolymers are also disclosed.
    Type: Application
    Filed: June 13, 2007
    Publication date: November 29, 2007
    Applicant: Dow Global Technologies Inc.
    Inventors: Rajen Patel, David Fuchs, Pradeep Jain, Seema Karande, Mehmet Demirors, Mark Spencer, Kim Walton, Angela Taha, Phillip Hustad, Roger Kuhlman, Anthony Castelluccio
  • Publication number: 20070254176
    Abstract: In one embodiment the invention is an article comprising at least two layers, a first or low crystallinity layer comprising a low crystallinity polymer and a second or high crystallinity layer comprising a high crystallinity polymer. The high crystallinity polymer has a melting point as determined by differential scanning calorimetry (DSC) that is about the same or within less than 25 C of the melting point of the low crystallinity polymer. The article is elongated at a temperature below the melting point of the low crystallinity polymer in at least one direction to an elongation of at least about 50% of its original length or width, to form a pre-stretched article. Preferably, the high crystallinity layer is capable of undergoing plastic deformation upon the elongation.
    Type: Application
    Filed: October 24, 2006
    Publication date: November 1, 2007
    Inventors: Rajen Patel, Andy Chang
  • Publication number: 20070243785
    Abstract: The elastic fabric comprising a cross-linked polyolefin fiber, wherein the fabric has retractions both in warp-wise and weft-wise directions of the fabric of 8% or less after treated by dry heat at 65° C. for 30 minutes is disclosed. Also disclosed is a process for producing an elastic fabric, comprising: retracting a fabric comprising a cross-linked polyolefin fiber while dyeing the fabric, and then stretching or relaxing the fabric at a stretch ratio of 15% or less to finish the fabric with heat-setting. The present invention relates to an elastic fabric having an excellent chemical resistance and an excellent dimensional stability in the form of a product, which is suitably used for sporting fabrics such as swimming suits, leotards and the like, inner fabrics for ladies as well as outer fabrics, for example.
    Type: Application
    Filed: June 19, 2007
    Publication date: October 18, 2007
    Inventors: Akira Hamano, Akira Nishimoto, Seishyu Hayashi, Yasuo Ohta, Rajen Patel, Rona Reid, Antonio Batistini
  • Publication number: 20070173162
    Abstract: The present invention relates to nonwoven webs or fabrics. In particular, the present invention relates to nonwoven webs having superior abrasion resistance and excellent softness characteristics. The nonwoven materials comprise fibers made from of a polymer blend of isotactic polypropylene, reactor grade propylene based elastomers or plastomers, and optionally, a homoge-neously branched ethylene/alpha olefin plastomer or elastomer. The isotactic polypropylene can be homopolymer polypropylene, and random copolymers of propylene and one or more alpha-olefins. The reactor grade propylene based elastomers or plastomers plastomer have a molecular weight distribution of less than about 3.5, and a heat of fusion less than about 90 joules/gm. In particular, the reactor grade propylene based elastomers or plastomers contains from about 3 to about 15 percent by weight of units derived from an ethylene, and a melt flow rate of from about 2 to about 200 grams/10 minutes.
    Type: Application
    Filed: April 8, 2005
    Publication date: July 26, 2007
    Inventors: Samuel Ethiopia, Gert Claasen, Rajen Patel, Kenneth Stewart, Thomas Allgeuer, Edward Knickerbocker, Randy Pepper, Thomas Pressly
  • Publication number: 20070092704
    Abstract: The invention is an article comprising at least two layers, a low crystallinity layer and a high crystallinity layer. One or both layers is capable of being elongated so that a pre-stretched article is capable of being formed.
    Type: Application
    Filed: October 25, 2006
    Publication date: April 26, 2007
    Applicant: Dow Global Technologies Inc.
    Inventors: Rajen Patel, Andy Chang, Hong Peng, Seema Karande, Benjamin Poon, Yunwa Cheung
  • Publication number: 20070036972
    Abstract: Fibers that exhibit good elasticity or extensibility and tenacity, and low modulus are prepared from propylene-based copolymers. The propylene-based copolymers comprise at least about 50 weight percent (wt %) of units derived from propylene and at least about 8 wt % of units derived from one or more comonomers other than propylene, e.g., ethylene. Particularly preferred propylene copolymers are characterized as having 13C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity. In one aspect of the invention, fibers are subjected to stress-induced crystallization by subjecting the fiber to tensile elongation during draw.
    Type: Application
    Filed: August 3, 2006
    Publication date: February 15, 2007
    Inventors: Andy Chang, Jozef Van Dun, Hong Peng, Randy Pepper, Edward Knickerbocker, Rajen Patel, Byron Day, Joy Jordan, Antonios Doufas, Lizhi Liu, Stephen Englebert, Renette Richard, Christian Sanders, Varunesh Sharma
  • Publication number: 20070020453
    Abstract: Fibers having improved resistance to moisture at elevated temperatures comprise at least two elastic polymers, one polymer heat-settable and the other polymer heat-resistant, the heat-resistant polymer comprising at least a portion of the exterior surface of the fiber. The fibers typically have a bicomponent and/or a biconstituent core/sheath morphology. Typically, the core comprises an elastic thermoplastic urethane, and the sheath comprises a homogeneously branched polyolefin, preferably a homogeneously branched substantially linear ethylene polymer.
    Type: Application
    Filed: September 25, 2006
    Publication date: January 25, 2007
    Inventors: Ashish Sen, John Klier, Rajen Patel, Hongyu Chen, Thoi Ho
  • Publication number: 20060269748
    Abstract: Extensible bicomponent fibers and webs particularly adapted for disposable personal care product component applications. Sheath/core configurations providing desirable feel properties for elastic embodiments when compared with conventional elastic fibers and webs are obtained with specific olefin polymer combinations and sheath configurations.
    Type: Application
    Filed: August 3, 2006
    Publication date: November 30, 2006
    Inventors: Joy Jordan, Renette Richard, Christian Sanders, Varunesh Sharma, Stephen Englebert, Bryon Day, Andy Chang, Hong Peng, Josef Van Dun, Randy Pepper, Edward Knickerbocker, Antonios Doufas, Rajen Patel