Patents by Inventor Ravi Chandran

Ravi Chandran 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).

  • Publication number: 20030220786
    Abstract: In order to enhance the quality of a communication signal derived from speech and noise, a filter divides the communication signal into a plurality of frequency band signals. A calculator generates a plurality of power band signals each having a power band value and corresponding to one of the frequency band signals. The power band values are based on estimating, over a time period, the power of one of the frequency band signals. The time period is different for different ones of the frequency band signals. The power band values are used to calculate weighting factors which are used to alter the frequency band signals that are combined to generate an improved communication signal.
    Type: Application
    Filed: February 28, 2003
    Publication date: November 27, 2003
    Inventors: Ravi Chandran, Bruce E. Dunne, Daniel J. Marchok
  • Publication number: 20030209290
    Abstract: The disclosure relates to a process for forming a deposit on the surface of a metallic or conductive surface. The process employs an electrolytic process to deposit a silicate containing coating or film upon a metallic or conductive surface.
    Type: Application
    Filed: August 2, 2002
    Publication date: November 13, 2003
    Inventors: Robert L. Heimann, Branko Popov, Bruce flint, Nancy G. Heimann, Ravi Chandran, William M. Dalton
  • Publication number: 20030178317
    Abstract: The disclosure relates to a process for forming a deposit on the surface of a metallic or conductive surface. The process employs an energy enhanced process to deposit a silicate containing coating or film upon a metallic or conductive surface.
    Type: Application
    Filed: March 3, 2003
    Publication date: September 25, 2003
    Inventors: Robert I. Heimann, William M. Dalton, John Hahn, David M. Price, Wayne I. Soucie, Ravi Chandran
  • Publication number: 20030165627
    Abstract: An electroless or electrolytic process for treating metallic surfaces is disclosed. The disclosed process exposes the metallic surface to a first medium comprising at least one silicate, and then to a second medium comprising colloidal silica (additional processing steps can be employed before, between and after exposure to the first and second mediums). The first and second mediums can be electrolytic or electroless.
    Type: Application
    Filed: February 5, 2003
    Publication date: September 4, 2003
    Inventors: Robert L. Heimann, Bruce Flint, Ravi Chandran, Jonathan L. Bass, James S. Falcone
  • Publication number: 20030152152
    Abstract: A communication system (10) receives a communication signal comprising first and second data with different compression levels, such as highly compressed and weakly compressed levels. A mode detector (15) detects the level of compression. One or more signal decoders (20, 22) decode the highly compressed data. An analyzer (30) determines the type of enhancement required. One or more processors (48, 50, 80) enhance the data as required. An encoder (60) reencodes the enhanced decoded data. Metrics (90) may aid the operation of the analyzer (30).
    Type: Application
    Filed: February 14, 2002
    Publication date: August 14, 2003
    Inventors: Bruce E. Dunne, Ravi Chandran, Daniel J. Marchok
  • Publication number: 20030149111
    Abstract: The present invention is directed to a liquid formulation of metformin or its pharmaceutically acceptable salts thereof. The liquid pharmaceutical composition comprises a therapeutically effective amount of metformin or its pharmaceutically acceptable salt, in a liquid carrier, which may also include a sweetener that does not increase the blood glucose level of a subject after ingestion thereof. In one embodiment, it may also include alkyl hydroxyethylcellulose, and/or a polyhydroxy alcohol. In another embodiment, the carrier may contain a sweetener, mineral acid, and bicarbonate salt maintained at a pH of 4.0 to 9.0. It is useful for treating hyperglycemia and diabetes.
    Type: Application
    Filed: March 6, 2003
    Publication date: August 7, 2003
    Inventors: Ravi Chandran, Ashish Gogia
  • Patent number: 6599643
    Abstract: The disclosure relates to a process for forming a deposit on the surface of a metallic or conductive surface. The process employs an energy enhanced process to deposit a silicate containing coating or film upon a metallic or conductive surface.
    Type: Grant
    Filed: March 22, 2001
    Date of Patent: July 29, 2003
    Assignee: Elisha Holding LLC
    Inventors: Robert L. Heimann, William M. Dalton, John Hahn, David M. Price, Wayne L. Soucie, Ravi Chandran
  • Publication number: 20030135364
    Abstract: The spectral shape of a communication signal is preserved by filtering it into a selected number of frequency band signals representing a selected number of the frequency bands. A calculator generates a plurality of initial gain signals having initial gain values for altering the gain of the frequency band signals. Each initial gain signal corresponds to one of the frequency band signals. Each initial gain value is derived from a measurement of the power of at least a portion of one of the frequency band signals. The calculator also generates a plurality of modified gain signals having modified gain values. Each modified gain signal corresponds to at least one of the frequency band signals and each modified gain value is derived from one or more functions of at least two of the initial gain values. The frequency band signals are altered in response to the modified gain signals to generate weighted frequency band signals which are combined to generate an improved communication signal.
    Type: Application
    Filed: December 11, 2002
    Publication date: July 17, 2003
    Inventors: Ravi Chandran, Bruce E. Dunne, Daniel J. Marchok
  • Patent number: 6592738
    Abstract: The disclosure relates to a process for forming a deposit on the surface of a metallic or conductive surface. The process employs an electrolytic process to deposit a silicate containing coating or film upon a metallic or conductive surface.
    Type: Grant
    Filed: February 1, 2001
    Date of Patent: July 15, 2003
    Assignee: Elisha Holding LLC
    Inventors: Robert L. Heimann, William M. Dalton, John Hahn, David M. Price, Wayne L. Soucie, Ravi Chandran
  • Patent number: 6591234
    Abstract: A processor (300) is arranged to divide a communication signal into a plurality of frequency band signals including speech and noise components due to speech and noise. The processor generates first and second power signals for the frequency band signals. Each first power signal is based on estimating over a first time period the power of one of the frequency band signals. Each second power signal is based on estimating over a second time period less than the first time period the power of one of the frequency band signals. The processor generates condition signals representing conditions of the frequency band signals, and adjusts the gain of the frequency band signals in response to the condition signals to generate adjusted frequency band signals. The processor then combines the adjusted frequency band signals to generate an adjusted communication signal.
    Type: Grant
    Filed: January 7, 2000
    Date of Patent: July 8, 2003
    Assignee: Tellabs Operations, Inc.
    Inventors: Ravi Chandran, Daniel J. Marchok, Bruce E. Dunne
  • Publication number: 20030112750
    Abstract: An arbitration unit according to an embodiment of the present invention is disclosed. The arbitration unit includes an allocation unit that assigns a first number of slots in a frame to a first flow and a second number of slots in the frame to a second flow. The arbitration unit includes a scheduling unit that assigns first slot positions to the first number of slots in the frame and second slot positions to the second number of slots in the frame using a binary distribution tree.
    Type: Application
    Filed: December 17, 2001
    Publication date: June 19, 2003
    Inventors: Terry J. Hrabik, Robert B. Magill, Ravi Chandran, Kent D. Benson
  • Patent number: 6559187
    Abstract: The present invention is directed to a liquid formulation of metformin or its pharmaceutically acceptable salts thereof. The liquid pharmaceutical composition comprises a therapeutically effective amount of metformin or its pharmaceutically acceptable salt, in a liquid carrier, which may also include a sweetener that does not increase the blood glucose level of a subject after ingestion thereof. In one embodiment, it may also include alkyl hydroxyethylcellulose, and/or a polyhydroxy alcohol. In another embodiment, the carrier may contain a sweetener, mineral acid, and bicarbonate salt maintained at a pH of 4.0 to 9.0. It is useful for treating hyperglycemia and diabetes.
    Type: Grant
    Filed: August 7, 2001
    Date of Patent: May 6, 2003
    Assignee: Ranbaxy Signature LLC
    Inventors: Ravi Chandran, Ashish Gogia
  • Patent number: 6548197
    Abstract: A novel process and apparatus for power generation from biomass and other carbonaceous feedstocks are provided. The process integrates a pulse combustor steam reformer with a fuel cell to generate electricity such that (i) efficiencies are higher than those of conventional and emerging advanced power systems, and (ii) emissions are lower than those proposed by the new environmental regulations, i.e. one-tenth of the New Source Performance Standards. The pulse combustor steam reformer generates a hydrogen-rich, medium-Btu fuel gas that is electrochemically oxidized in the fuel cell to generate electricity. The apparatus may be configured to produce only power or combined heat and power.
    Type: Grant
    Filed: August 18, 2000
    Date of Patent: April 15, 2003
    Assignee: Manufacturing & Technology Conversion International, Inc.
    Inventors: Ravi Chandran, Momtaz N. Mansour
  • Publication number: 20030053618
    Abstract: Methods and apparatus for processing a received voice signal from a variable-delay network by a communications system that has at least one echo canceller. An echo canceller determines delay characteristics that are associated with the received voice signal and correspondingly modifies echo cancellation processing. In a variation of the embodiment of the invention, a first echo canceller sends silence descriptor information to a second echo canceller. The second echo canceller reconstructs a voice signal based upon the silence descriptor information and excitation vector information.
    Type: Application
    Filed: October 30, 2002
    Publication date: March 20, 2003
    Applicant: Tellabs Operations, Inc.
    Inventors: Daniel J. Marchok, Richard C. Younce, Charles W.K. Gritton, Ravi Chandran
  • Patent number: 6529868
    Abstract: In order to enhance the quality of a communication signal derived from speech and noise, a filter divides the communication signal into a plurality of frequency band signals. A calculator generates a plurality of power band signals each having a power band value and corresponding to one of the frequency band signals. The power band values are based on estimating, over a time period, the power of one of the frequency band signals. The time period is different for different ones of the frequency band signals. The power band values are used to calculate weighting factors which are used to alter the frequency band signals that are combined to generate an improved communication signal.
    Type: Grant
    Filed: March 28, 2000
    Date of Patent: March 4, 2003
    Assignee: Tellabs Operations, Inc.
    Inventors: Ravi Chandran, Bruce E. Dunne, Daniel J. Marchok
  • Patent number: 6523003
    Abstract: The spectral shape of a communication signal is preserved by filtering it into a selected number of frequency band signals representing a selected number of the frequency bands. A calculator generates a plurality of initial gain signals having initial gain values for altering the gain of the frequency band signals. Each initial gain signal corresponds to one of the frequency band signals. Each initial gain value is derived from a measurement of the power of at least a portion of one of the frequency band signals. The calculator also generates a plurality of modified gain signals having modified gain values. Each modified gain signal corresponds to at least one of the frequency band signals and each modified gain value is derived from one or more functions of at least two of the initial gain values. The frequency band signals are altered in response to the modified gain signals to generate weighted frequency band signals which are combined to generate an improved communication signal.
    Type: Grant
    Filed: March 28, 2000
    Date of Patent: February 18, 2003
    Assignee: Tellabs Operations, Inc.
    Inventors: Ravi Chandran, Bruce E. Dunne, Daniel J. Marchok
  • Patent number: 6522746
    Abstract: Methods and apparatus for processing a transmitted voice signal include a centralized frame controller providing at least one boundary control signal to voice processing blocks and controlling the operation of the voice processing blocks on the transmitted voice signal based upon the boundary control signal.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: February 18, 2003
    Assignee: Tellabs Operations, Inc.
    Inventors: Daniel J. Marchok, Richard C. Younce, Charles W. K. Gritton, Ravi Chandran
  • Publication number: 20020054998
    Abstract: The disclosure relates to a process for forming a deposit on the surface of a metallic or conductive surface. The process employs an energy enhanced process to deposit a silicate containing coating or film upon a metallic or conductive surface.
    Type: Application
    Filed: March 22, 2001
    Publication date: May 9, 2002
    Inventors: Robert L. Heimann, William M. Dalton, John Hahn, David M. Price, Wayne L. Soucie, Ravi Chandran
  • Publication number: 20020040063
    Abstract: The present invention is directed to a liquid formulation of metformin or its pharmaceutically acceptable salts thereof. The liquid pharmaceutical composition comprises a therapeutically effective amount of metformin or its pharmaceutically acceptable salt, in a liquid carrier, which may also include a sweetener that does not increase the blood glucose level of a subject after ingestion thereof. In one embodiment, it may also include alkyl hydroxyethylcellulose, and/or a polyhydroxy alcohol. In another embodiment, the carrier may contain a sweetener, mineral acid, and bicarbonate salt maintained at a pH of 4.0 to 9.0. It is useful for treating hyperglycemia and diabetes.
    Type: Application
    Filed: August 7, 2001
    Publication date: April 4, 2002
    Inventors: Ravi Chandran, Ashish Gogia
  • Patent number: 6355591
    Abstract: A fluid catalytic cracking additive composition to obtain enhanced yield of Liquified Petroleum Gas in catalytic cracking of high boiling petroleum feed stocks comprising 4 to 20 wt. % aluminum phosphate composite, 1-40 wt. % crystalline molecular sieve Zeolites from the group selected from mordenite ZSM-5, Beta and mixtures thereof and 40-90 wt. % clay.
    Type: Grant
    Filed: January 3, 2000
    Date of Patent: March 12, 2002
    Assignee: Indian Oil Corporation Limited
    Inventors: Mohan Prabhu Kuvettu, Gopal Ravi Chandran, Sanjay Kumar Ray, Kamlesh Gupta, Ganga Shankar Misra, Venkatachalam Krishnan, Mitra Bhanu Patel, Satish Makhija, Sobhan Ghosh