Patents by Inventor S. A. Ravishankar

S. A. Ravishankar 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: 8263722
    Abstract: The invention relates to a continuous polymerization process for preparing a random ethylene interpolymer with propylene and/or 1-butene which comprises: (A) polymerizing ethylene, and as an ?-olefin comonomer propylene and/or 1-butene under continuous random polymerization conditions in the presence of single site catalyst system employing an ionic activator having cyclic ligands shielding a central charge bearing atom, at a temperature of 140° C. to 250° C. at a conversion of ethylene of 80 to 99% and a comonomer conversion of from at least 30% and (B) devolatilizing the polymer to provide an ethylene copolymer having a density of from 0.85 to 0.92 g/cm3, an MI of from 0.01 to 100 g/10 min, preferably from 0.1 to 20, and an I21/I2 of from 30 to 400. The invention also relates to polymers made by such processes containing as ?-olefin comonomer propylene and/or 1-butene, having a density of from 0.85 to 0.92 g/cm3, an MI of from 0.
    Type: Grant
    Filed: March 21, 2005
    Date of Patent: September 11, 2012
    Assignee: Exxonmobil Chemical Patents Inc.
    Inventors: Narayanaswami Raja Dharmarajan, Rui Zhao, Bruce Allan Harrington, George James Pehlert, Periagaram S. Ravishankar, Kent L. Chasey
  • Patent number: 8245285
    Abstract: A system and method is provided to facilitate secure communications for a server-application executing on a resource-constrained device. A request, from a client application executing on a client device to access a server application executing on the resource-constrained device is received on an application-specific secure port of a resource-constrained device. The request is authenticated using a security token stored in an application context of the server application. The authentication is performed by a transport security layer protocol executing within the application context of the server application. The security token is specific for the server application. A secure connection is established directly between the secure port and the client application upon the authentication being successful.
    Type: Grant
    Filed: September 22, 2006
    Date of Patent: August 14, 2012
    Assignee: Oracle America, Inc.
    Inventors: Tanjore S. Ravishankar, Thierry Violleau, Matthew R. Hill
  • Publication number: 20120123069
    Abstract: The invention relates to a method for controlling properties of a polyolefin. More particularly, the invention relates to a method for controlling certain properties of an ethylene-butene copolymer and compositions thereof using isobutylene and/or other C4 components.
    Type: Application
    Filed: October 18, 2011
    Publication date: May 17, 2012
    Inventors: Michael C. Bulawa, Periagaram S. Ravishankar, Anthony J. Dias
  • Patent number: 8178625
    Abstract: The instant disclosure is directed to a thermoplastic vulcanizate composition comprising a dynamically-cured rubber; from about 20 to about 300 parts by weight of a thermoplastic resin per 100 parts by weight rubber and from about 30 to about 250 parts by weight additional oil per 100 parts by weight rubber; wherein the rubber comprises a multimodal polymer composition cured with a curing agent, the multimodal polymer composition comprising 45 to 75 wt % of a first polymer fraction and 25 to 55 wt % of a second polymer fraction, each comprising ethylene, a C3-C10 alpha-olefin, and a non-conjugated diene, wherein the polymer fractions have been polymerized using a Ziegler-Natta catalyst system, wherein the first polymer fraction has a Mooney viscosity of greater than or equal to about 150 ML(1+4@125° C.), and the second polymer fraction has a Mooney viscosity of about 20 ML to about 120 ML; and about 10 phr to about 50 phr of an extender oil.
    Type: Grant
    Filed: August 1, 2006
    Date of Patent: May 15, 2012
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Maria D. Ellul, Periagaram S. Ravishankar, Jianya Cheng, Paul E. McDaniel
  • Publication number: 20120015854
    Abstract: Lube oil compositions and methods for making the same are provided. The lubricating oil composition can include at least one propylene-based polymer comprising 60 wt % to 98 wt % propylene derived units, other units derived from one or more other alpha olefins, and a base oil. The propylene-based polymer can have a triad tacticity of 90% or more, a heat of fusion of less than 80 J/g, and a weight average molecular weight (Mw) as measured by GPC of from 70,000 to 250,000.
    Type: Application
    Filed: August 8, 2008
    Publication date: January 19, 2012
    Inventors: Periagaram S. Ravishankar, Kirk A. Nass
  • Patent number: 8087031
    Abstract: An approach for making an object owned by a first application that executes in a first isolated execution context accessible to a second application that executes in a second isolated execution context is described herein. According to this approach the object is associated with the first isolated execution context. A request is received to render the object accessible to the second application. Ownership of the object is transferred to the second application by changing the isolated execution context that is associated with the object to the second isolated execution context, thereby rendering the object accessible to the second application.
    Type: Grant
    Filed: August 28, 2006
    Date of Patent: December 27, 2011
    Assignee: Oracle America, Inc.
    Inventors: Thierry Violleau, Tanjore S. Ravishankar
  • Publication number: 20110313117
    Abstract: Ethylene propylene copolymers, substantially free of diene, are described. The copolymers will have a uniform distribution of both tacticity and comonomer between copolymer chains. Further, the copolymers will exhibit a statistically insignificant intramolecular difference of tacticity. The copolymers are made in the presence of a metallocene catalyst.
    Type: Application
    Filed: August 26, 2011
    Publication date: December 22, 2011
    Inventors: Sudhin Datta, Bruce A. Harrington, Weiguo Hu, Periagaram S. Ravishankar, George Rodriguez
  • Publication number: 20110275764
    Abstract: Thermoplastic elastomer compositions and methods for making same. The elastomer composition can include at least one partially cured rubber component that is an ethylene-alpha-olefin-vinyl norbornene elastomeric polymer, and at least one thermoplastic component. The rubber component is at least partially cured using a peroxide curative in an amount effective to yield a cure level of the rubber component of at least 85%. The rubber component has a molecular weight distribution (MWD) less than 6, and a branching index greater than 0.60.
    Type: Application
    Filed: November 5, 2009
    Publication date: November 10, 2011
    Inventors: Maria D. Ellul, Periagaram S. Ravishankar
  • Patent number: 8032872
    Abstract: To execute legacy smart card applications in a next generation smart card environment, a mechanism converts the applications into a format executable by the next generation smart card platforms. For instance, in a Java-based environment, a normalizer tool translates a CAP file into a Java Class file. Additional mechanisms recreate, on next generation smart cards, a specialized environment that allows the legacy applications to execute without impacting legacy and non-legacy application performance. For example, mechanisms create new instances of previously shared objects so that legacy applications can continue to expect exclusive access to those objects. Moreover, mechanisms manage the communication between a legacy application and non-legacy applications by controlling how and when calls are sent to the legacy application.
    Type: Grant
    Filed: December 18, 2006
    Date of Patent: October 4, 2011
    Assignee: Oracle America, Inc.
    Inventors: Thierry P. Violleau, Tanjore S. Ravishankar, Matthew R. Hill, Saqib Ahmad
  • Patent number: 8026323
    Abstract: Ethylene propylene copolymers, substantially free of diene, are described. The copolymers will have a uniform distribution of both tacticity and comonomer between copolymer chains. Further, the copolymers will exhibit a statistically insignificant intramolecular difference of tacticity. The copolymers are made in the presence of a metallocene catalyst.
    Type: Grant
    Filed: April 19, 2007
    Date of Patent: September 27, 2011
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Sudhin Datta, Bruce A. Harrington, Weiguo Hu, Periagaram S. Ravishankar, George Rodriguez
  • Publication number: 20110112238
    Abstract: A process for preparing a thermoplastic vulcanizate, the process comprising: charging a reactor with an olefinic copolymer rubber, where the olefinic copolymer rubber is characterized by a multimodal molecular weight, an average branching index of greater than 0.8, includes less than 10 parts by weight oil per 100 parts by weight rubber, includes less than 1 parts by weight non-rubber particulate, per 100 parts by weight rubber, and is in the form of granules having a particle size less than 8 mm; charging the reactor, contemporaneously or sequentially with respect to the rubber, with a thermoplastic resin, an oil, and a cure system; melt mixing the rubber, the thermoplastic resin, the oil, and the cure system; and dynamically vulcanizing the rubber.
    Type: Application
    Filed: March 31, 2008
    Publication date: May 12, 2011
    Inventors: Maria Dolores Ellul, Periagaram S. Ravishankar, Paul E. McDanicl
  • Patent number: 7900200
    Abstract: A persistence management system facilitates porting servlet-based applications, such as Web applications, to an extremely mobile/nomadic system such as a resource-constrained device platform, e.g., a smart card, where sessions on a card acceptance device are intermittent by nature. Persistence management system (i) minimizes the startup time, and (ii) restores applications in a consistent state. The persistent management system supports: a) selective persistence of servlet model objects: both container-managed objects and application-managed objects; b) optional persistence of threads; and c) optional persistence of connection objects.
    Type: Grant
    Filed: June 16, 2006
    Date of Patent: March 1, 2011
    Assignee: Oracle America, Inc.
    Inventors: Thierry Violleau, Tanjore S. Ravishankar, Sebastian Jürgen Hans, Matthew R. Hill
  • Patent number: 7739731
    Abstract: A first application instance is associated with a protection domain based on credentials (e.g.: a signed certificate) associated with a set of application code that, when executed, gives rise to the application instance. The first application instance executes in a first execution context. An indication is received that the first application instance seeks access to protected functionality associated with a second execution context. In response to receiving the indication, a determining is made as to whether the first application instance has permission to access the protected functionality. The determination is made by determining the protection domain with which the first application instance is associated, and determining if the protection domain with which the first application instance is associated is in the set of one or more protection domains.
    Type: Grant
    Filed: August 21, 2006
    Date of Patent: June 15, 2010
    Assignee: Oracle America, Inc.
    Inventors: Thierry Violleau, Tanjore S. Ravishankar, Matt Hill
  • Publication number: 20100137521
    Abstract: Provided are thermoplastic polymer compositions having a single melting point, articles made therefrom, and methods for elevating the melting point of low melting point polymers. Thermoplastic polymer compositions are composed of one or more high melting point polyolefins and a thermoplastic component that includes a low melting point polypropylene. High melting point polyolefins are composed of a stereoregular polypropylene having a tacticity similar to the low melting point polypropylene. The low melting point polypropylene includes, for example, propylene homopolymers and copolymers composed of propylene and one or more comonomers. Thermoplastic polymer compositions may also optionally contain any of the various additives commonly used in such polymer compositions, such as for example oils, etc. In one embodiment, thermoplastic polymer compositions are thermoplastic elastomer compositions that include an elastomeric component composed of an elastomer or rubber.
    Type: Application
    Filed: April 14, 2008
    Publication date: June 3, 2010
    Inventors: Periagaram S. Ravishankar, Maria D. Ellul
  • Patent number: 7711783
    Abstract: A generic event notification service for a resource-constrained device is provided. One method includes receiving an event having a unique event identifier, and determining whether an event-producing application is authorized to fire the event. Upon a determination of authorization to fire the event, a determination is made whether any event-consuming applications are authorized by the event-producing application to receive the event. Upon a determination of authorization to receive the event, the event is forwarded to each authorized event-consuming application. In this manner, secure, flexible, generic, and uniform application interaction is facilitated.
    Type: Grant
    Filed: June 16, 2006
    Date of Patent: May 4, 2010
    Assignee: Oracle America, Inc.
    Inventors: Thierry Violleau, Tanjore S. Ravishankar, Sebastian Jürgen Hans, Matthew R. Hill
  • Publication number: 20100023951
    Abstract: An approach for making an object owned by a first application that executes in a first isolated execution context accessible to a second application that executes in a second isolated execution context is described herein. According to this approach the object is associated with the first isolated execution context. A request is received to render the object accessible to the second application. Ownership of the object is transferred to the second application by changing the isolated execution context that is associated with the object to the second isolated execution context, thereby rendering the object accessible to the second application.
    Type: Application
    Filed: August 28, 2006
    Publication date: January 28, 2010
    Inventors: Thierry Violleau, Tanjore S. Ravishankar
  • Publication number: 20100024016
    Abstract: A first application instance is associated with a protection domain based on credentials (e.g.: a signed certificate) associated with a set of application code that, when executed, gives rise to the application instance. The first application instance executes in a first execution context. An indication is received that the first application instance seeks access to protected functionality associated with a second execution context. In response to receiving the indication, a determining is made as to whether the first application instance has permission to access the protected functionality. The determination is made by determining the protection domain with which the first application instance is associated, and determining if the protection domain with which the first application instance is associated is in the set of one or more protection domains.
    Type: Application
    Filed: August 21, 2006
    Publication date: January 28, 2010
    Inventors: Thierry Violleau, Tanjore S. Ravishankar, Matt Hill
  • Patent number: 7617390
    Abstract: A method for resetting a pin on an access card is disclosed. The method includes generating a server authentication (SA) public key and an SA private key and attempting a write of the SA public key to the access card over a non-secure channel. The method further includes determining if the access card currently contains an existing SA public key.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: November 10, 2009
    Assignee: Sun Microsystems, Inc.
    Inventors: Aseem Sharma, Ellen H. Siegel, Tanjore S. Ravishankar, Joe Wei
  • Patent number: 7393462
    Abstract: A mineral beneficiating reagent containing an alkyl hydroxamic acid or salt thereof and a nonionic surfactant. The alkyl hydroxamic acid or a salt thereof is represented by the formula: R—C(?O)N(R?)—OM, wherein R is linear or branched C2-C18 alkyl, linear or branched C2-C18 alkenyl, C6-C20 aryl or substituted aryl, C7-C26 aralkyl or substituted aralkyl; R? is H, C1-C12 alkyl or aralkyl; M is hydrogen, an alkali metal, or an ammonium cation represented by N+(A,B,C,D) wherein each of A,B,C,D, respectively, are H or C1-C6 alkyl or benzyl radicals. The nonionic surfactant can be any known nonionic surfactant, including but not limited ethoxylated alcohols, esters, ethoxylated acids, ethoxylated (alkyl) phenols, alcanolamides, polyethylene oxide copolymers and mixtures thereof.
    Type: Grant
    Filed: May 13, 2004
    Date of Patent: July 1, 2008
    Assignee: Cytec Technology Corp.
    Inventors: Abdul Gorken, Lino G. Magliocco, D. R. Nagaraj, Alan S. Rothenberg, S. A. Ravishankar
  • Patent number: 7390866
    Abstract: The present invention provides curable and cured propylene-based elastomers, optionally including a diene, and having isotactic polypropylene crystallinity, a melting point by DSC equal to or less than 110° C., and a heat of fusion of from 5 J/g to 50 J/g. The present invention also provides blend compositions comprising any of the propylene-based elastomers described herein. The present invention also provides compositions comprising any of the propylene-based elastomers described herein and 1 to 100 parts by weight of inorganic filler per 100 parts of polymer. The present invention also provides films, fibers, fabrics, molded objects, and extruded forms which include any of the inventive compositions described herein.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: June 24, 2008
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Sudhin Datta, Rul Zhao, Srivatsan Srinivas, Majia Y Amin, Periagaram S Ravishankar