Patents by Inventor Mita Chattoraj

Mita Chattoraj 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).

  • METHOD OF MONITORING BIOFOULING IN MEMBRANE SEPARATION SYSTEMS
    Publication number: 20040018583
    Abstract: Methods for monitoring and/or controlling biofouling in membrane separation systems are provided. The present invention utilizes measurable amounts of fluorogenic agent(s) added to a feed stream to monitor and/or control the level of microbial growth during membrane separation and, thus, the purification of such feed stream during membrane separation.
    Type: Application
    Filed: July 23, 2002
    Publication date: January 29, 2004
    Inventors: Bosco P. Ho, May W. Wu, E. H. Kelle Zeiher, Mita Chattoraj
  • Measurement of microbiological activity in an opaque medium
    Patent number: 6440689
    Abstract: A method for monitoring the microbiological contamination of opaque media is described and claimed. In this method, a Fluorogenic Dye is added to an Aliquot of opaque medium. After a certain time period, a fluorometer capable of measuring fluorescent signals in an opaque medium is used to measure the fluorogenic signals of the Fluorogenic Dye and the Reacted Fluorogenic Dye. A Useful RATIO of the fluorescent signal of the Reacted Fluorogenic Dye to the fluorescent signal of the Fluorogenic Dye is calculated and the information gleaned from the RATIO is used to ascertain the state of microbiological contamination in the opaque medium.
    Type: Grant
    Filed: June 28, 2001
    Date of Patent: August 27, 2002
    Assignee: Ondeo Nalco Company
    Inventors: Rodney H. Banks, Nancy L. Casselman, Mita Chattoraj, Ronald V. Davis, Michael J. Fehr, Sasireka S. Ramesh, David P. Workman
  • Measurement of microbiological activity in an opaque medium
    Publication number: 20020042092
    Abstract: A method for monitoring the microbiological contamination of opaque media is described and claimed. In this method, a Fluorogenic Dye is added to an Aliquot of opaque medium. After a certain time period, a fluorometer capable of measuring fluorescent signals in an opaque medium is used to measure the fluorogenic signals of the Fluorogenic Dye and the Reacted Fluorogenic Dye. A Useful RATIO of the fluorescent signal of the Reacted Fluorogenic Dye to the fluorescent signal of the Fluorogenic Dye is calculated and the information gleaned from the RATIO is used to ascertain the state of microbiological contamination in the opaque medium.
    Type: Application
    Filed: June 28, 2001
    Publication date: April 11, 2002
    Inventors: Rodney H. Banks, Nancy L. Casselman, Mita Chattoraj, Ronald V. Davis, Michael J. Fehr, Sasireka S. Ramesh, David P. Workman
  • Method of making chlorofluoroethers
    Patent number: 6362379
    Abstract: A method is provided for preparation of chlorofluoroethers ClCF2CFClOR8f and Cl2CFCFClOR8f by direct fluorination of Cl2CHCH2OR8 and Cl3CCH2OR8, respectively, wherein R8 is a C1-C20 alkyl-or acyl-containing group optionally up to 5 ether oxygen atoms and optionally substituted by functional groups and R81, is the corresponding perfluoroalkyl or perfluoracyl-containing group.
    Type: Grant
    Filed: May 1, 2001
    Date of Patent: March 26, 2002
    Assignee: 3M Innovative Properties Company
    Inventors: George G. I. Moore, Fred B. McCormick, Mita Chattoraj, Elisa M. Cross, Junkang Jacob Liu, Ralph R. Roberts, Jay F. Schulz
  • Measurement and control of sessile and planktonic microbiological activity in industrial water systems
    Patent number: 6329165
    Abstract: A method for monitoring both the planktonic and sessile microbial populations in an industrial water system by the addition of a fluorogenic dye compound is described and claimed.
    Type: Grant
    Filed: December 30, 1999
    Date of Patent: December 11, 2001
    Assignee: Nalco Chemical Company
    Inventors: Mita Chattoraj, Michael J. Fehr, Steven R. Hatch, Robert W. Shiely
  • Halogenated acrylates and polymers derived therefrom
    Patent number: 6313245
    Abstract: Acrylates having a high degree of halogenation, as well as polymers that include one or more mer units derived from such acrylates provide materials having tailorable optical and physical properties. The polymers find utility particularly in optical devices including optical waveguides and interconnecting devices.
    Type: Grant
    Filed: August 23, 1999
    Date of Patent: November 6, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: George G. I. Moore, Fred B. McCormick, Mita Chattoraj, Elisa M. Cross, Junkang Jacob Liu, Ralph R. Roberts, Jay F. Schulz
  • Halogenated acrylates and polymers derived therefrom
    Publication number: 20010037028
    Abstract: Acrylates having a high degree of halogenation, as well as polymers that include one or more mer units derived from such acrylates provide materials having tailorable optical and physical properties. The polymers find utility particularly in optical devices including optical waveguides and interconnecting devices.
    Type: Application
    Filed: May 1, 2001
    Publication date: November 1, 2001
    Applicant: 3M Innovative Properties Company
    Inventors: George G.I. Moore, Fred B. McCormick, Mita Chattoraj, Elisa M. Cross, Junkang Jacob Liu, Ralph R. Roberts, Jay F. Schulz
  • Halogenated acrylates and polymers derived therefrom
    Patent number: 6288266
    Abstract: Acrylates having a high degree of halogenation, as well as polymers that include one or more mer units derived from such acrylates provide materials having tailorable optical and physical properties. The polymers find utility particularly in optical devices including optical waveguides and interconnecting devices.
    Type: Grant
    Filed: August 24, 1999
    Date of Patent: September 11, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: George G. I. Moore, Fred B. McCormick, Mita Chattoraj, Elisa M. Cross, Junkang Jacob Liu, Ralph R. Roberts, Jay F. Schulz
  • Halogenated acrylates and polymers derived therefrom
    Patent number: 6005137
    Abstract: Acrylates having a high degree of halogenation, as well as polymers that include one or more mer units derived from such acrylates provide materials having tailorable optical and physical properties. The polymers find utility particularly in optical devices including optical waveguides and interconnecting devices.
    Type: Grant
    Filed: June 10, 1997
    Date of Patent: December 21, 1999
    Assignee: 3M Innovative Properties Company
    Inventors: George G. I. Moore, Fred B. McCormick, Mita Chattoraj, Elisa M. Cross, Junkang Jacob Liu, Ralph R. Roberts, Jay F. Schulz