Patents by Inventor A. Shankar

A. Shankar 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: 6052187
    Abstract: A device to provide hyperspectral reflection spectrum, hyperspectral depolarization, and hyperspectral fluorescence spectrum data in a portable, remote sensing instrument. The device can provide a large range of remotely-sensed optical property data, presently only obtainable in laboratories, in a low-cost field instrument. Among its many uses, the present invention can be used by farmers as a tool for determining the nitrogen content of crops to optimize fertilizer laydown.
    Type: Grant
    Filed: August 31, 1998
    Date of Patent: April 18, 2000
    Assignee: Containerless Research, Inc.
    Inventors: Shankar Krishnan, Daniel Scott Hampton, Paul C. Nordine
  • Patent number: 6048472
    Abstract: Hydrocarbon feedstocks are converted into synthesis gas in a two-stage process comprising an initial steam reforming step followed by final conversion to synthesis gas in a mixed conducting membrane reactor. The steam reforming step converts a portion of the methane into synthesis gas and converts essentially all of the hydrocarbons heavier than methane into methane, hydrogen, and carbon oxides. The steam reforming step produces an intermediate feed stream containing methane, hydrogen, carbon oxides, and steam which can be processed without operating problems in a mixed conducting membrane reactor. The steam reforming and mixed conducting membrane reactors can be heat-integrated for maximum operating efficiency and produce synthesis gas with compositions suitable for a variety of final products.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: April 11, 2000
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Shankar Nataraj, Robert Byron Moore, Steven Lee Russek
  • Patent number: 6049148
    Abstract: A rotary motor and a rotary magnetic bearing are integrated in a compact assembly that is contact-less. A stator assembly surrounds a ferromagnetic rotor with an annular air gap which can accommodate a cylindrical wall, e.g. of a chamber for semiconductor wafer processing. The stator assembly has a permanent magnet or magnets sandwiched between vertically spaced magnetic stator plates with plural pole segments. The rotor is preferably a ring of a magnetic stainless steel with complementary pole teeth. The stator assembly (i) levitates and passively centers the rotor along a vertical axis and against tilt about either horizontal axis, (ii) provides a radial position bias for the rotor, and (iii) establishes a motor flux field at the rotor poles. Polyphase coils wound on the stator plates produce a rotating flux field that drives the rotor as a synchronous homopolar motor. A rotor without pole teeth allows operation with an asynchronous inductive drive.
    Type: Grant
    Filed: October 2, 1998
    Date of Patent: April 11, 2000
    Assignee: SatCon Technology Corporation
    Inventors: Stephen B. Nichols, Shankar Jagannathan, Kevin Leary, David Eisenhaure, William Stanton, Richard Hockney, James Downer, Vijay Gondhalekar
  • Patent number: 6034022
    Abstract: Group 4 metal constrained geometry complexes comprising a fused ring indenyl derivative ligand, catalytic derivatives thereof, processes for preparing the same and their use as components of olefin polymerization catalysts are disclosed.
    Type: Grant
    Filed: June 3, 1999
    Date of Patent: March 7, 2000
    Assignee: The Dow Chemical Company
    Inventors: Mark H. McAdon, Jasson T. Patton, Peter N. Nickias, Ravi B. Shankar, Francis J. Timmers, Brian W. S. Kolthammer, Daniel D. VanderLende, Steven M. Ueligger
  • Patent number: 6015806
    Abstract: Androgen nucleus derivatives having specified substituents at the 17.alpha. position are disclosed for use as antiandrogens for the treatment of androgen-dependent diseases. In some preferred embodiments, the compound ##STR1## is formulated together with pharmaceutically acceptable diluent or carrier for topical use in the treatment of androgen-dependent diseases associated with the skin.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 18, 2000
    Assignee: Endorecherche
    Inventors: Fernand Labrie, Yves Merand, Shankar M. Singh
  • Patent number: 5995737
    Abstract: In this invention there is disclosed a system and method for tuning a speed controller that is used to keep a rail-based transportation system within a prescribed speed limit while providing a smooth ride. A fuzzy logic controller is synthesized to track the performance of a train simulator to a predetermined velocity profile over a specified track profile. A genetic algorithm is used to adjust the fuzzy logic controller's performance by adjusting its parameters in a sequential order of significance.
    Type: Grant
    Filed: September 8, 1997
    Date of Patent: November 30, 1999
    Assignee: General Electric Company
    Inventors: Piero Patrone Bonissone, Yu-To Chen, Pratap Shankar Khedkar
  • Patent number: 5983144
    Abstract: In this invention there is disclosed a system and method for tuning look-ahead error measurements that is used to improve the train handling performance of a rail-based transportation system. A look-ahead error module along with a fuzzy logic controller is synthesized to ensure that a train simulator complies to a prescribed speed limit over a specified track profile while providing a smooth ride. A genetic algorithm is used to adjust the parameters of the look-ahead error module.
    Type: Grant
    Filed: December 29, 1997
    Date of Patent: November 9, 1999
    Assignee: General Electric Company
    Inventors: Piero Patrone Bonissone, Yu-To Chen, Pratap Shankar Khedkar
  • Patent number: 5964882
    Abstract: A timer counter with multiple timers in a pipelined architecture in which the multiple timers are serviced in the pipeline. The timer counter includes a control unit having a first control section and a second control section for sequencing the servicing of each of the multiple timers in a pipeline. The first and second control sections provide a pipeline sequence of the total required service of the timer counter. The pipeline architecture allows the multiple timers to be serviced in a pipeline without increasing the overall number of clocks.
    Type: Grant
    Filed: November 8, 1996
    Date of Patent: October 12, 1999
    Assignee: Advanced Micro Devices, Inc.
    Inventor: Shankar Dey
  • Patent number: 5965756
    Abstract: Group 4 metal constrained geometry complexes comprising a fused ring indenyl derivative ligand, catalytic derivatives thereof, processes for preparing the same and their use as components of olefin polymerization catalysts are disclosed.
    Type: Grant
    Filed: October 14, 1997
    Date of Patent: October 12, 1999
    Assignee: The Dow Chemical Company
    Inventors: Mark H. McAdon, Jasson T. Patton, Peter N. Nickias, Ravi B. Shankar, Francis J. Timmers, Brian W. Kolthammer, Daniel D. VanderLende, Steven M. Ueligger
  • Patent number: 5963945
    Abstract: A prefetching resource allocation system is provided. Although performance improvements are realized through the use of prefetching, the use of prefetching introduces a problem where the client and the server may become unsynchronized with respect to their understanding of whether a resource is allocated. The improved resource allocation system prevents this synchronization problem from occurring by maintaining a counter for the client as well as a counter for the server. Each time that the server allocates a resource to the client, the server increments its counter. Similarly, each time that the client receives an indication that the resource has been allocated on its behalf, the client increments its counter. When the client requests the deallocation of a resource, it provides the current value of its counter. Hence, upon receiving a deallocation request, the server determines if the client's counter value received in the deallocation request is less than the server's counter value.
    Type: Grant
    Filed: June 5, 1997
    Date of Patent: October 5, 1999
    Assignee: Microsoft Corporation
    Inventor: Shankar Pal
  • Patent number: 5942689
    Abstract: In this invention there is disclosed a system and method for predicting web breaks in a paper machine. In particular, this invention uses a neural network to predict web break tendencies from sensor measurements taken from the paper machine. Also, an induction tree model is used to isolate the root cause of the predicted web break tendencies.
    Type: Grant
    Filed: October 3, 1997
    Date of Patent: August 24, 1999
    Assignee: General Electric Company
    Inventors: Piero Patrone Bonissone, Yu-To Chen, Pratap Shankar Khedkar
  • Patent number: 5939286
    Abstract: The present invention describes hybrid interferon fusion polypeptides formed of a first segment that contains the N-terminal amino acid sequence of an interferon-tau polypeptide, and a second segment that contains the C-terminal amino acid sequence of a non-tau interferon type I polypeptide. The two segments are joined in the region of a mature interferon polypeptide between about residues 8 and 37. Also described are nucleic acid sequences encoding such interferon fusion polypeptides, expression vectors containing such sequences, and therapeutic applications of the interferon fusion polypeptides. The therapeutic applications include antiviral and anticellular proliferation applications. One advantage of the interferon fusion polypeptides of the present invention is that they do not have cytotoxic side-effects when used to treat cells.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: August 17, 1999
    Assignee: University of Florida
    Inventors: Howard Marcellus Johnson, Carol Hanlon Pontzer, Prem Shankar Subramaniam
  • Patent number: 5936250
    Abstract: Apparatus for the optical detection of selected toxic gases, using the ultraviolet region of the electromagnetic spectrum, and the known absorption properties of the toxic gases in the ultraviolet region. An ultraviolet flashlamp source illuminates a straight, highly polished metal tube with numerous perforations to permit access for the gas to be detected. The ultraviolet light then enters an optical compartment comprising an optical beamsplitter and two ultraviolet detectors with wavelength selective narrowband filters attached. The filters are selected so that one overlaps the region of absorption by the gas while the second is in a region where there is no absorption by the gas. The electronic circuit following the ultraviolet detectors and the drivers for the flashlamp, are timed by a microprocessor that provides the means for the electronics and data processing to be synchronized with the flashlamp pulse.
    Type: Grant
    Filed: July 24, 1997
    Date of Patent: August 10, 1999
    Assignee: General Monitors, Incorporated
    Inventors: Shankar Baliga, Herbert H. Rabe
  • Patent number: 5914489
    Abstract: Apparatus for the optical detection of flames or explosions, having an optical structure to perform continuous optical path monitoring of the optical window receiving the optical radiation, to ensure against the buildup of radiation absorbing or scattering materials. A light source internal to the housing illuminates a straight optically transmissive quartz or sapphire rod that protrudes through the housing beyond the optical window. The protruding tip of the light rod is beveled and metallized on the bevel to provide internal reflection of the light from the source, the angle of the bevel being such that the reflected light on exiting the light rod illuminates the optical window and the optical detector behind it, thereby providing a test for the cleanliness of the optical window. This optical technique for checking the cleanliness of the optical viewing element can be utilized by other optical instruments including imaging arrays, surveillance cameras and weapons.
    Type: Grant
    Filed: July 24, 1997
    Date of Patent: June 22, 1999
    Assignee: General Monitors, Incorporated
    Inventors: Shankar Baliga, Brett Bleacher
  • Patent number: 5909550
    Abstract: Heterogeneous resources of an integrated network environment are managed from a single network management station by correlating information pertaining to those resources. The integrated network environment is generally managed by a predetermined application tool executing on the management station that provides an application-centric map of the network for communicating with resources conversant with the application tool. Information pertaining to other protocol-specific resources are overlaid on the map to facilitate monitoring of those specific resources by the application tool. As a result, the station can interactively access the application-centric resources while also obtaining status information from the protocol-specific resources of the network.
    Type: Grant
    Filed: October 16, 1996
    Date of Patent: June 1, 1999
    Assignee: Cisco Technology, Inc.
    Inventors: Ravindra Shankar, Frank Maly
  • Patent number: 5908929
    Abstract: A process for the manufacture of the antibiotic 7-(D-.alpha.-amino-.alpha.-phenylacetamido)-3-methyl-3-cephem-4-carboxylic acid (cephalexin) and pharmaceutically acceptable salts thereof. It consists of reacting an enamine protected potassium salt of D-(-)-.alpha.-phenyl glycine (Dane salt) with an acid chloride in a twin solvent mixture in the presence of a pyridine derived twin catalytic mixture at -20 to -65.degree. C. The resulting mixed anhydride is condensed with an alkyl guanidinium salt solution of 7-amino desacetoxy cephalosporanic acid (7-ADCA) at -10.degree. C. to -65.degree. C. followed by hydrolytic cleavage of the enamine derivative of the resulting compound with an aqueous mineral acid and precipitation of the antibiotic in the presence of an alcohol as co-solvent. If desired the cephalexin is converted into its pharmaceutically acceptable salts in a known manner.
    Type: Grant
    Filed: July 9, 1997
    Date of Patent: June 1, 1999
    Assignee: Vitara Chemicals Limited
    Inventors: Vellate Ravindranathan Nair, Anil Shankar Chowdhary, Jyoti Rajesh Agrawal
  • Patent number: 5905467
    Abstract: A wireless communication terminal comprises a first housing section including an antenna for enabling wireless communications with the terminal and a second housing section including a second communications antenna, the second housing section being extendibly connected to the first housing in an manner such that when the second housing section is in its extended position the second antenna is located one half wavelength from the first antenna. One or both of the antennas may be a fixed type, e.g., a whip or stub, or a retractable type, e.g., telescoping. The antennas may be located external or may be internal (e.g., patch type antennas) to the housing sections.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: May 18, 1999
    Assignee: Lucent Technologies Inc.
    Inventors: Shankar Narayanaswamy, Markus Rupp
  • Patent number: 5898618
    Abstract: A programmable logic device (PLD) performs a self-test blank check erase verify operation on memory elements of the PLD to verify that they are erased prior to programming. An enhanced reference voltage source is provided to reliably generate a reference source voltage at a predetermined voltage level regardless of variations in the on-chip power supply voltage and temperature variations. The reference voltage source includes a first resistor connected between the on-chip voltage source and an output node, a second resistor connected to the output node, and a reference voltage adjustment circuit connected between the second resistor and ground. The reference voltage adjustment circuit is programmable to selectively connect the output node to ground through one or more resistive elements in response to input signals such that the output node is maintained at the predetermined reference voltage.
    Type: Grant
    Filed: January 23, 1998
    Date of Patent: April 27, 1999
    Assignee: Xilinx, Inc.
    Inventors: Shankar Lakkapragada, Derek R. Curd
  • Patent number: 5893932
    Abstract: A microprocessor system integrated on a chip having one or more address generation devices, at least one memory location, and at least one peripheral unit. The address path is divided into two portions having a first logic unit conditioning the address from the one or more address generation devices on the first portion of the address path for gating onto the second portion of the address path. The first logic unit converts a single 16 bit address location into two 8 bit address locations. The first logic unit maintains a first address on the second address path when the CPU is in a next address pipeline mode. A second logic unit selects a memory architecture so that the system can address DRAM units having a various number of rows and/or columns.
    Type: Grant
    Filed: October 23, 1996
    Date of Patent: April 13, 1999
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Shankar Dey, Ming Zhao, Dinh Kim Bui
  • Patent number: 5885991
    Abstract: Disclosed are thiocyanomethyloxy(or thiocyanomethylthio)-1,2,3-benzatriazin-4(3H)-one compounds corresponding to one of the formulae: ##STR1## wherein Z represents oxygen or sulfur; X represents --C1, --F, --I, C.sub.1 -C.sub.7 straight or branched chain alkyl, C.sub.1 -C.sub.7 straight or branched chain alkoxy, --CF.sub.3, --OCF.sub.3, --CN, --COOR wherein R is C.sub.1 -C.sub.7 straight or branched chain alkyl and n is an integer of from 0-4.These compounds have been found to exhibit antimicrobial and marine antifouling activity in industrial and commercial applications and compositions containing these compounds are so employed.
    Type: Grant
    Filed: June 26, 1997
    Date of Patent: March 23, 1999
    Assignee: The Dow Chemical Company
    Inventors: Ravi B. Shankar, R. Garth Pews, Duane R. Romer