Patents by Inventor Kannan Srinivasan

Kannan Srinivasan 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).

  • Half-Duplex Speakerphone Echo Canceler
    Publication number: 20130329882
    Abstract: A speakerphone having transmit path with a microphone and a first amplifier having a gain determined by a controller and an input coupled to the microphone, a receive path with a second amplifier having a gain determined by the controller and a speaker coupled to an output of the second amplifier, and operable in a half-duplex mode using an adaptive echo canceller to at least partially remove from the transmit path acoustically-coupled signals from the receive path. The controller increases the gain of the first amplifier and decreases the gain of the second amplifier when a level of signals in the transmit path exceed a level of signals in the receive path, and decreases the gain of the first amplifier and increases the gain of the second amplifier when the level of signals in the receive path exceed the level of signals in the transmit path.
    Type: Application
    Filed: June 7, 2012
    Publication date: December 12, 2013
    Inventors: Donald R. Laturell, Kannan Srinivasan, Chao-pin Chin
  • Process For The Preparation Of Fatty Acid Alkyl Esters (Biodiesel) From Triglyceride Oils Using Eco-Friendly Solid Base Catalysts
    Publication number: 20130331587
    Abstract: This invention relates to an improved process for the preparation of green fatty acid methyl esters (FAME; commonly called as biodiesel) from different triglyceride oils using mixed metal oxides derived from layered double hydroxides (referred here as LDHs) as reusable solid heterogeneous base catalysts. This process uses very low alcohohoil molar ratio and catalyst and/or products are easily separable after the reaction through simple physical processes. The properties of thus obtained biodiesel meet the standard biodiesel values and can directly be used as transport fuel.
    Type: Application
    Filed: February 10, 2012
    Publication date: December 12, 2013
    Inventors: Kannan Srinivasan, Sivashunmugam Sankaranarayanan, Churchil Angel Antonyraj
  • SAMPLE PRETREATMENT AND EXTRACTION
    Publication number: 20130316466
    Abstract: A method for pretreating and extracting a liquid sample by sorbing an aqueous liquid sample, including an organic analyte and an acid or a base, in a solid sorbent material, and at least partially neutralizing the acid or base by reaction with neutralizing ions retained on a support surface, and contacting the liquid sample-sorbed sorbent material at elevated temperature and pressure with an organic solvent to extract the analyte into said solvent, preferably in a vessel having an extraction chamber with a zirconium metal interior surface.
    Type: Application
    Filed: August 5, 2013
    Publication date: November 28, 2013
    Inventors: Kannan SRINIVASAN, Bruce RICHTER, Christopher A. POHL, Brett MURPHY, Brian DORICH, SM Rahmat ULLAH
  • Ion detector and system
    Patent number: 8551318
    Abstract: Apparatus and method for detecting current or potential generated in a liquid sample suitable for use in a chromatography or other liquid sample analytical system. One embodiment is an electrolytic ion transfer device with a signal detector in communication with the electrodes of the transfer device. Another is a combination ion transfer device/electrolyte generator. Another substitutes a detector for the ion transfer device in the combination.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: October 8, 2013
    Assignees: Board of Regents, The University of Texas System, Dionex Corporation
    Inventors: Purnendu K. Dasgupta, Bingcheng Yang, Kannan Srinivasan
  • ION CHROMATOGRAPHY SYSTEMS WITH FLOW-DELAY ELUENT RECYCLE
    Publication number: 20130259750
    Abstract: A chromatographic method including chromatographically separating sample ionic species in an eluent stream, detecting the separated sample ionic species, catalytically combining hydrogen and oxygen gases or catalytically decomposing hydrogen peroxide in a catalytic gas elimination chamber, and recycling the effluent stream from the chamber to the chromatography separation column. The residence time between the detector and the chamber is at least about one minute. Also, flowing the recycle sequentially through two detector effluent flow channels of an electrolytic membrane suppressor. Also, applying heat or UV energy between the detector and the chamber. Also, detecting bubbles after the chamber. Also, a Platinum group metal catalyst and ion exchange medium in the chamber. Apparatus for performing the methods.
    Type: Application
    Filed: May 30, 2013
    Publication date: October 3, 2013
    Inventors: Yan LIU, Kannan SRINIVASAN, Christopher A. POHL, Sheetal BHARDWAJ, Zhongqing LU
  • ION CHROMATOGRAPHY SYSTEMS WITH FLOW-DELAY ELUENT RECYCLE
    Publication number: 20130256232
    Abstract: A chromatographic method including chromatographically separating sample ionic species in an eluent stream, detecting the separated sample ionic species, catalytically combining hydrogen and oxygen gases or catalytically decomposing hydrogen peroxide in a catalytic gas elimination chamber, and recycling the effluent stream from the chamber to the chromatography separation column. The residence time between the detector and the chamber is at least about one minute. Also, flowing the recycle sequentially through two detector effluent flow channels of an electrolytic membrane suppressor. Also, applying heat or UV energy between the detector and the chamber. Also, detecting bubbles after the chamber. Also, a Platinum group metal catalyst and ion exchange medium in the chamber. Apparatus for performing the methods.
    Type: Application
    Filed: May 30, 2013
    Publication date: October 3, 2013
    Inventors: Yan LIU, Kannan SRINIVASAN, Christopher A. POHL, Sheetal BHARDWAJ, Zhongqing LU
  • SORPTION OF WATER FROM A SAMPLE USING A POLYMERIC DRYING AGENT
    Publication number: 20130233093
    Abstract: A method of extracting an analyte from a sample is described where the sample includes water. The sample and polymeric drying agent are added to a container. The polymeric drying agent includes a cationic monomer, an anionic monomer, and a crosslinker. The polymeric drying agent is configured to sorb water from the sample.
    Type: Application
    Filed: March 8, 2012
    Publication date: September 12, 2013
    Inventors: Christopher A. POHL, Kannan SRINIVASAN, SM Rahmat ULLAH
  • ELECTROLYTIC BUFFER GENERATOR
    Publication number: 20130220814
    Abstract: Buffer generators are described based on electrodialytic devices. The methods of using these devices can generate buffers for diverse applications, including separations, e.g., HPLC and ion chromatography. Also provided are chromatographic devices including the buffer generators, generally located upstream from a chromatography column, sample injector valve or both.
    Type: Application
    Filed: August 23, 2012
    Publication date: August 29, 2013
    Applicants: DIONEX CORPORATION, BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEM
    Inventors: Purnendu K. DASGUPTA, Yongjing CHEN, Kannan SRINIVASAN
  • Sample pretreatment and extraction
    Patent number: 8507292
    Abstract: A method for pretreating and extracting a liquid sample by sorbing an aqueous liquid sample, including an organic analyte and an acid or a base, in a solid sorbent material, and at least partially neutralizing the acid or base by reaction with neutralizing ions retained on a support surface, and contacting the liquid sample-sorbed sorbent material at elevated temperature and pressure with an organic solvent to extract the analyte into said solvent, preferably in a vessel having an extraction chamber with a zirconium metal interior surface.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: August 13, 2013
    Assignee: Dionex Corporation
    Inventors: Kannan Srinivasan, Bruce Richter, Christopher A. Pohl, Brett Murphy, Brian Dorich, S. M. Rahmat Ullah
  • Titration device and method
    Patent number: 8475639
    Abstract: A titration apparatus comprising a titration reservoir for a non-flowing sample solution to be titrated; an ion source reservoir comprising an ion source solution of selected ions; an ion exchange membrane barrier capable of passing ions from the ion source solution to the titration reservoir, but of blocking bulk liquid flow; a first electrode in electrical communication with the ion source reservoir; and a second electrode in electrical communication with the titration reservoir. Also, an electrolytic titrant generator for use in the titration apparatus.
    Type: Grant
    Filed: December 6, 2007
    Date of Patent: July 2, 2013
    Assignee: Dionex Corporation
    Inventor: Kannan Srinivasan
  • Ion chromatography systems with flow-delay eluent recycle
    Patent number: 8465982
    Abstract: A chromatographic method including chromatographically separating sample ionic species in an eluent stream, detecting the separated sample ionic species, catalytically combining hydrogen and oxygen gases or catalytically decomposing hydrogen peroxide in a catalytic gas elimination chamber, and recycling the effluent stream from the chamber to the chromatography separation column. The residence time between the detector and the chamber is at least about one minute. Also, flowing the recycle sequentially through two detector effluent flow channels of an electrolytic membrane suppressor. Also, applying heat or UV energy between the detector and the chamber. Also, detecting bubbles after the chamber. Also, a Platinum group metal catalyst and ion exchange medium in the chamber. Apparatus for performing the methods.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: June 18, 2013
    Assignee: Dionex Corporation
    Inventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu
  • METHOD AND APPARATUS FOR INTERNET CUSTOMER RETENTION
    Publication number: 20130073379
    Abstract: A method of dynamically optimizing customer retention for a web marketing site is provided. That method includes specifying a permissible defunct threshold, specifying a range of offers to be included in a set of promotions, determining a probability that a customer will become defunct in a predetermined period of time since the last interaction of that customer with the web site, and providing a promotion to a customer if the probability that the customer will become defunct in the predetermined period of time since the last interaction of that customer with the web site is greater than a predetermined threshold.
    Type: Application
    Filed: September 14, 2012
    Publication date: March 21, 2013
    Applicant: Intellions, Inc.
    Inventors: Kannan Srinivasan, Michael I. Shamos
  • THREE-ELECTRODE BUFFER GENERATOR AND METHOD
    Publication number: 20130048498
    Abstract: An electrodialytic buffer generator is described. The buffer generator may include a central buffer-generating channel having an inlet and outlet, a second chamber, and a third chamber. The buffer-generating channel, the second chamber, and the third chamber may each include an electrode. The buffer generator may also include a first ion exchange barrier and a second ion exchange barrier. The first ion exchange barrier can be disposed between the second chamber and the buffer-generating channel. The second ion exchange barrier can be disposed between the third chamber and the buffer-generating channel.
    Type: Application
    Filed: August 23, 2012
    Publication date: February 28, 2013
    Applicants: DIONEX CORPORATION, BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEM
    Inventors: Purnendu K. DASGUPTA, Yongjing CHEN, Kannan SRINIVASAN
  • METHOD AND APPARATUS FOR TIME-AWARE AND LOCATION-AWARE MARKETING
    Publication number: 20120289245
    Abstract: Methods and systems for communicating inferred information to a wireless device user are disclosed. A method comprises determining a location of the wireless device and a time of day at the location of the wireless device inferring an interest of the wireless device user and transmitting data to said device; wherein said data is related to the inferred interest of the wireless device user. A method also comprises inferring the interest of the wireless device user based upon the devices vicinity to at least one business entity. Another method comprises transmitting information to the wireless device user that is related to the business in which the wireless device user is in the vicinity.
    Type: Application
    Filed: May 15, 2012
    Publication date: November 15, 2012
    Inventors: Kannan Srinivasan, Michael I. Shamos
  • Ion detector and system
    Patent number: 8293099
    Abstract: Apparatus and method for detecting current or potential generated in a liquid sample suitable for use in a chromatography or other liquid sample analytical system. One embodiment is an electrolytic ion transfer device with a signal detector in communication with the electrodes of the transfer device. Another is a combination ion transfer device/electrolyte generator. Another substitutes a detector for the ion transfer device in the combination.
    Type: Grant
    Filed: February 28, 2008
    Date of Patent: October 23, 2012
    Assignees: Dionex Corporation, Board of Regents, The University of Texas System
    Inventors: Purnendu K. Dasgupta, Bingcheng Yang, Kannan Srinivasan
  • Method and apparatus for internet customer retention
    Patent number: 8280773
    Abstract: A method of dynamically optimizing customer retention for a web marketing site is provided. That method includes specifying a permissible defunct threshold, specifying a range of offers to be included in a set of promotions, determining a probability that a customer will become defunct in a predetermined period of time since the last interaction of that customer with the web site, and providing a promotion to a customer if the probability that the customer will become defunct in the predetermined period of time since the last interaction of that customer with the web site is greater than a predetermined threshold.
    Type: Grant
    Filed: March 13, 2001
    Date of Patent: October 2, 2012
    Assignee: Intellions, Inc.
    Inventors: Kannan Srinivasan, Michael I. Shamos
  • ELECTROSTATICALLY BOUND HYPERBRANCHED ANION EXCHANGE SURFACE COATING PREPARED VIA CONDENSATION POLYMERIZATION USING DITERTIARY AMINE LINKERS FOR IMPROVED DIVALENT ANION SELECTIVITY
    Publication number: 20120231195
    Abstract: The present invention provides a new design for high capacity stationary phases for dianion selective ion chromatography. The stationary phases include one or more layers which are products of condensation polymerization. Multiple components are of use in forming the first polymer layer and the condensation polymer structure, thereby providing a stationary phase that can be engineered to have a desired property such as ion capacity, ion selectivity, and the like. Exemplary condensation polymers are formed by the reaction of at least one polyfunctional compound with at least one compound of complimentary reactivity, e.g., a nucleophilic polyfunctional compound reacting with an electrophilic compound.
    Type: Application
    Filed: March 9, 2012
    Publication date: September 13, 2012
    Applicant: Dionex Corporation
    Inventors: Christopher A. Pohl, Kannan Srinivasan, Sheetal Bhardwaj
  • SINGLE CHANNEL FULL DUPLEX WIRELESS COMMUNICATIONS
    Publication number: 20120201173
    Abstract: In one aspect there is provided a method. The method may include receiving a first analog radio frequency signal including a signal of interest and an interference signal caused by a second analog radio frequency signal transmitted in full duplex over a channel from which the first analog transmission is received; combining the first analog radio frequency signal and a portion of the second analog radio frequency signal to generate an output analog radio frequency signal characterized by at least a reduction or an elimination of the interference signal included in the output analog radio frequency signal; and providing the output analog radio frequency signal. Related apparatus, systems, methods, and articles are also described.
    Type: Application
    Filed: November 9, 2011
    Publication date: August 9, 2012
    Inventors: Mayank Jain, Jung Il Choi, Kannan Srinivasan, Philip Levis, Sachin Katti, Siddharth Seth
  • CHEMICAL SUPPRESSORS AND METHOD OF USE
    Publication number: 20120141328
    Abstract: A non-electrolytic method and apparatus for treating an aqueous sample stream including analyte ions and matrix ions of opposite charge, for pretreatment or suppression. The apparatus includes an ion exchange membrane capable of passing only ions of opposite charge to the analyte ions, a sample stream flow channel, a first aqueous stream ion receiving flow channel adjacent one side of the sample stream flow channel and separated therefrom by the first ion exchange membrane, and stationary flow-through ion exchange packing disposed in the sample stream flow channel. The ion receiving channel has an ion exchange capacity for the matrix ions less than about 25% of the ion exchange capacity for the matrix ions.
    Type: Application
    Filed: February 8, 2012
    Publication date: June 7, 2012
    Applicant: Dionex Corporation
    Inventors: Kannan SRINIVASAN, Christopher A. POHL
  • Method and apparatus for time-aware and location-aware marketing
    Patent number: 8195197
    Abstract: A method of communicating inferred information to a wireless communication device user is provided. That method includes determining a location of the wireless device, inferring a likely interest of the user from the location of the wireless device, and transmitting data related to the interest to the wireless device. The method may also ascertain time at the location of the wireless communication device user and infer an interest of the user from the time and location of the user. In addition, the method may include inferences made from information related to preferences of the user.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: June 5, 2012
    Assignee: Intellions, Inc.
    Inventors: Kannan Srinivasan, Michael I. Shamos