Patents by Inventor Vishnu V. Rajasekharan

Vishnu V. Rajasekharan 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).

  • Determination of analytes using electrochemically active indicator species as reactants
    Patent number: 10539529
    Abstract: A method for determination of an unknown analyte using quantitative electrochemical generation of a detectable species, which provides specified quantities of the species, is described. As an example, free chlorine concentration measurements may be performed using N,N-Diethyl-p-phenylenediamine (DPD), or N,N-bis(2,4-di-sulfobenzyl)toluidinetetrasodium salt (SBT), for obtaining an in-situ calibration curve, whereby matrix effects are eliminated.
    Type: Grant
    Filed: August 30, 2017
    Date of Patent: January 21, 2020
    Assignee: HACH COMPANY
    Inventor: Vishnu V Rajasekharan
  • Apparatus, composition and method for determination of chemical oxidation demand
    Patent number: 10302552
    Abstract: Methods for measuring chemical oxygen demand, a composition and a kit useful for measuring chemical oxygen demand, a method for calibrating a chemical oxygen demand analysis method, and a method for determining carbonaceous chemical oxygen demand are disclosed.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: May 28, 2019
    Assignee: HACH COMPANY
    Inventors: Vishnu V. Rajasekharan, John Lee, Richard E. Leggett
  • DETERMINATION OF ANALYTES USING ELECTROCHEMICALLY ACTIVE INDICATOR SPECIES AS REACTANTS
    Publication number: 20180059057
    Abstract: A method for determination of an unknown analyte using quantitative electrochemical generation of a detectable species, which provides specified quantities of the species, is described. As an example, free chlorine concentration measurements may be performed using N,N-Diethyl-p-phenylenediamine (DPD), or N,N-bis(2,4-di-sulfobenzyl)toluidinetetrasodium salt (SBT), for obtaining an in-situ calibration curve, whereby matrix effects are eliminated.
    Type: Application
    Filed: August 30, 2017
    Publication date: March 1, 2018
    Inventor: Vishnu V Rajasekharan
  • COD/TOC analyses using ferrate oxidation
    Patent number: 9476866
    Abstract: Apparatuses for analyzing total carbon and chemical oxygen demand in a sample are disclosed. Also disclosed is a method for analyzing carbon and chemical oxygen demand.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: October 25, 2016
    Assignee: Hach Company
    Inventors: Vishnu V. Rajasekharan, John Lee, Richard E. Leggett
  • APPARATUS, COMPOSITION AND METHOD FOR DETERMINATION OF CHEMICAL OXIDATION DEMAND
    Publication number: 20150108009
    Abstract: Methods for measuring chemical oxygen demand, a composition and a kit useful for measuring chemical oxygen demand, a method for calibrating a chemical oxygen demand analysis method, and a method for determining carbonaceous chemical oxygen demand are disclosed.
    Type: Application
    Filed: October 23, 2014
    Publication date: April 23, 2015
    Inventors: Vishnu V. Rajasekharan, John Lee, Richard E. Leggett
  • CARBON ANALYSIS USING FERRATE OXIDATION
    Publication number: 20150111304
    Abstract: Methods for measuring total organic carbon in a water sample and total carbon in a water sample are disclosed.
    Type: Application
    Filed: October 23, 2014
    Publication date: April 23, 2015
    Inventors: Richard E. Leggett, John Lee, Vishnu V. Rajasekharan
  • COD/TOC ANALYSES USING FERRATE OXIDATION
    Publication number: 20150110677
    Abstract: Apparatuses for analyzing total carbon and chemical oxygen demand in a sample are disclosed. Also disclosed is a method for analyzing carbon and chemical oxygen demand.
    Type: Application
    Filed: October 23, 2014
    Publication date: April 23, 2015
    Inventors: Vishnu V. Rajasekharan, John Lee, Richard E. Leggett