Patents by Inventor Bhaskar T. Ramakrishnan
Bhaskar T. Ramakrishnan 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).
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Patent number: 8801157Abstract: A liquid ink transport assembly mitigates the migration of ink dye from one conduit in a plurality of conduits to another conduit in the plurality of conduits. The liquid ink transport assembly includes a plurality of conduits, each conduit in the plurality having a first end and a second end, the conduits in the plurality being arranged in a parallel configuration with at least one conduit being spatially separated from an adjacent conduit by a first distance that is greater than a second distance spatially separating other conduits in the plurality of conduits, and a heater, the plurality of conduits being positioned proximate to a first side of the heater to enable the heater to heat ink being carried between the first and the second ends of the plurality of conduits.Type: GrantFiled: April 16, 2013Date of Patent: August 12, 2014Assignee: Xerox CorporationInventors: Chad David Freitag, Pratima G. N. Rao, Patricia A. Wang, Tony R. Rogers, Bhaskar T. Ramakrishnan
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Patent number: 8540330Abstract: An inkjet printer has been developed, which identifies one or more printing metrics and selects a corrective operation for image data. After application of the corrective operation to image data, firing signals are generated with reference to the modified image data to compensate for an inoperative inkjet in a printhead of the inkjet printer.Type: GrantFiled: September 27, 2010Date of Patent: September 24, 2013Assignee: Xerox CorporationInventors: Bhaskar T. Ramakrishnan, Brent E. Fleming, Joel Chan
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Publication number: 20130229472Abstract: A liquid ink transport assembly mitigates the migration of ink dye from one conduit in a plurality of conduits to another conduit in the plurality of conduits. The liquid ink transport assembly includes a plurality of conduits, each conduit in the plurality having a first end and a second end, the conduits in the plurality being arranged in a parallel configuration with at least one conduit being spatially separated from an adjacent conduit by a first distance that is greater than a second distance spatially separating other conduits in the plurality of conduits, and a heater, the plurality of conduits being positioned proximate to a first side of the heater to enable the heater to heat ink being carried between the first and the second ends of the plurality of conduits.Type: ApplicationFiled: April 16, 2013Publication date: September 5, 2013Applicant: Xerox CorporationInventors: Chad David Freitag, Pratima G.N. Rao, Patricia A. Wang, Tony R. Rogers, Bhaskar T. Ramakrishnan
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Patent number: 8469485Abstract: A system evaluates image quality in an image generating system. The system includes a test pattern generator configured to generate an image with an image generating system, an image capture device configured to generate a digital signal corresponding to the generated test pattern, an image evaluator configured to process the digital signal to detect and correct anomalies detected in the generated test pattern, a plurality of calibration tools, each calibration tool being comprised of at least one test pattern, at least one set of detection criteria, and at least one set of anomaly correction parameters, and a controller configured to select the calibration tools for operation of the test pattern generator and the image evaluator in accordance with a predetermined sequence that attenuates changes arising from application of correction parameters of one calibration tool upon a later selected calibration tool.Type: GrantFiled: January 23, 2012Date of Patent: June 25, 2013Assignee: Xerox CorporationInventors: Bhaskar T. Ramakrishnan, Andrew S. Yeh, Mary Lynne Morrow, Ernest I. Esplin, Pieter John Ganzer, John Albert Wright, Brent Edward Fleming
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Patent number: 8469497Abstract: A liquid ink transport assembly mitigates the migration of ink dye from one conduit in a plurality of conduits to another conduit in the plurality of conduits. The liquid ink transport assembly includes a plurality of conduits, each conduit in the plurality having a first end and a second end, the conduits in the plurality being arranged in a parallel configuration with at least one conduit being spatially separated from an adjacent conduit by a first distance that is greater than a second distance spatially separating other conduits in the plurality of conduits, and a heater, the plurality of conduits being positioned proximate to a first side of the heater to enable the heater to heat ink being carried between the first and the second ends of the plurality of conduits.Type: GrantFiled: February 4, 2010Date of Patent: June 25, 2013Assignee: Xerox CorporationInventors: Chad David Freitag, Pratima G. N. Rao, Patricia A. Wang, Tony R. Rogers, Bhaskar T. Ramakrishnan
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Patent number: 8300266Abstract: A method evaluates image quality in an ink printing system and generates data values for altering the operation of the ink printing system. The method includes generating an ink image on an ink image receiving member that corresponds to a digital image stored in the ink printing system, generating a scanned image signal corresponding to the ink image, generating firing signal waveform adjustments and image data adjustments with reference to the scanned image signal corresponding to the ink image, and operating a printhead in an ink imaging system with reference to the firing signal waveform adjustments and the image data adjustments.Type: GrantFiled: March 12, 2009Date of Patent: October 30, 2012Assignee: Xerox CorporationInventors: Andrew S. Yeh, Bhaskar T. Ramakrishnan, Kelly D. Sims, Katie Maria Teslow, Luo Cheng, George Laurens Taylor, John Alan Durbin, Ernest I. Esplin, Howard A. Mizes, Joel Chan, Ngoc-Diep Thi Nguyen, Susan J. Zoltner, Yeqing Zhang, Lisa Schmidt, Kenneth R. Chamberlain, Matthew Hudson Dixon, Steven Van Cleve Korol, James B. Campbell, Russell J. Watt
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Publication number: 20120120144Abstract: A system evaluates image quality in an image generating system. The system includes a test pattern generator configured to generate an image with an image generating system, an image capture device configured to generate a digital signal corresponding to the generated test pattern, an image evaluator configured to process the digital signal to detect and correct anomalies detected in the generated test pattern, a plurality of calibration tools, each calibration tool being comprised of at least one test pattern, at least one set of detection criteria, and at least one set of anomaly correction parameters, and a controller configured to select the calibration tools for operation of the test pattern generator and the image evaluator in accordance with a predetermined sequence that attenuates changes arising from application of correction parameters of one calibration tool upon a later selected calibration tool.Type: ApplicationFiled: January 23, 2012Publication date: May 17, 2012Applicant: XEROX CORPORATIONInventors: Bhaskar T. Ramakrishnan, Andrew S. Yeh, Mary Lynne Morrow, Ernest I. Esplin, Pieter John Ganzer, John Albert Wright, Brent Edward Fleming
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Patent number: 8162433Abstract: A method enables an ink jet image generating system to select an operational mode in response to detection of a missing ink jet. The method includes generating a digital image of an ink image on an image receiving member of an ink jet image generating system, detecting missing inkjets in a printhead of an ink jet image generating system from the digital image of the ink image on the image receiving member, and selecting an operational mode for the ink jet image generating system in response to the detection of at least one missing ink jet.Type: GrantFiled: March 30, 2009Date of Patent: April 24, 2012Assignee: Xerox CorporationInventors: Bhaskar T. Ramakrishnan, Mary Lynne Morrow
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Publication number: 20120075370Abstract: An inkjet printer has been developed, which identifies one or more printing metrics and selects a corrective operation for image data. After application of the corrective operation to image data, firing signals are generated with reference to the modified image data to compensate for an inoperative inkjet in a printhead of the inkjet printer.Type: ApplicationFiled: September 27, 2010Publication date: March 29, 2012Applicant: XEROX CORPORATIONInventors: Bhaskar T. Ramakrishnan, Brent E. Fleming, Joel Chan
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Patent number: 8132885Abstract: A system evaluates image quality in an image generating system in a manner that accounts for the interaction of the calibration tools used to evaluate and correct image quality in the image generating system.Type: GrantFiled: March 10, 2009Date of Patent: March 13, 2012Assignee: Xerox CorporationInventors: Bhaskar T. Ramakrishnan, Andrew S. Yeh, Mary Lynne Morrow, Ernest I. Esplin, Pieter John Ganzer, John Albert Wright, Brent Edward Fleming
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Publication number: 20110187800Abstract: A liquid ink transport assembly mitigates the migration of ink dye from one conduit in a plurality of conduits to another conduit in the plurality of conduits. The liquid ink transport assembly includes a plurality of conduits, each conduit in the plurality having a first end and a second end, the conduits in the plurality being arranged in a parallel configuration with at least one conduit being spatially separated from an adjacent conduit by a first distance that is greater than a second distance spatially separating other conduits in the plurality of conduits, and a heater, the plurality of conduits being positioned proximate to a first side of the heater to enable the heater to heat ink being carried between the first and the second ends of the plurality of conduits.Type: ApplicationFiled: February 4, 2010Publication date: August 4, 2011Applicant: XEROX CORPORATIONInventors: Chad David Freitag, Pratima G. N. Rao, Patricia A. Wang, Tony R. Rogers, Bhaskar T. Ramakrishnan
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Publication number: 20100245454Abstract: A method enables an ink jet image generating system to select an operational mode in response to detection of a missing ink jet. The method includes generating a digital image of an ink image on an image receiving member of an ink jet image generating system, detecting missing inkjets in a printhead of an ink jet image generating system from the digital image of the ink image on the image receiving member, and selecting an operational mode for the ink jet image generating system in response to the detection of at least one missing ink jet.Type: ApplicationFiled: March 30, 2009Publication date: September 30, 2010Applicant: XEROX CORPORATIONInventors: Bhaskar T. Ramakrishnan, Mary Lynne Morrow
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Publication number: 20100232652Abstract: A method evaluates image quality in an ink printing system and generates data values for altering the operation of the ink printing system. The method includes generating an ink image on an ink image receiving member that corresponds to a digital image stored in the ink printing system, generating a scanned image signal corresponding to the ink image, generating firing signal waveform adjustments and image data adjustments with reference to the scanned image signal corresponding to the ink image, and operating a printhead in an ink imaging system with reference to the firing signal waveform adjustments and the image data adjustments.Type: ApplicationFiled: March 12, 2009Publication date: September 16, 2010Applicant: Xerox CorporationInventors: Andrew S. Yeh, Bhaskar T. Ramakrishnan, Kelly D. Sims, Katie Maria Teslow, Luo Cheng, George Laurens Taylor, John Alan Durbin, Ernest I. Esplin, Howard A. Mizes, Joel Chan, Ngoc-Diep Thi Nguyen, Susan J. Zoltner, Yeqing Zhang, Lisa Schmidt, Kenneth R. Chamberlain, Matthew Hudson Dixon, Steven Van Cleve Korol, James B. Campbell, Russell J. Watt
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Publication number: 20100231635Abstract: A system evaluates image quality in an image generating system in a manner that accounts for the interaction of the calibration tools used to evaluate and correct image quality in the image generating system.Type: ApplicationFiled: March 10, 2009Publication date: September 16, 2010Applicant: XEROX CORPORATIONInventors: Bhaskar T. Ramakrishnan, Andrew S. Yeh, Mary Lynne Morrow, Ernest I. Esplin, Pieter John Ganzer, John Albert Wright, Brent Edward Fleming
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Patent number: 6239677Abstract: A thermal-magnetic trip unit, suitable for use in a circuit breaker, for eliminating the requirement for latching surfaces while still providing the additional force and motion required to trip the breaker during a short circuit or an overcurrent trip event. The trip unit comprises a link that is biased based on the position of a trip bar. A spring biases the link in a first direction when the trip unit is in a reset condition and biases the link in a second direction when the trip bar is rotated about a pivot point. A trip unit further including an improved indication-of-trip system comprising a two-piece trip bar mechanism and flag system is described to discriminate between overcurrent and short circuit faults. In this embodiment of the invention, visual confirmation of the cause of the trip is provided.Type: GrantFiled: February 10, 2000Date of Patent: May 29, 2001Assignee: General Electric CompanyInventors: Bhaskar T. Ramakrishnan, Roger Castonguay
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Patent number: 6222433Abstract: A thermal-magnetic trip unit, suitable for use in a circuit breaker, for eliminating the requirement for latching surfaces while still providing the additional force and motion required to trip the breaker during a short circuit or an overcurrent trip event. The trip unit comprises a link that is biased based on the position of a trip bar. A spring biases the link in a first direction when the trip unit is in a reset condition and biases the link in a second direction when the trip bar is rotated about a pivot point. A trip unit further including an improved indication-of-trip system comprising a two-piece trip bar mechanism and flag system is described to discriminate between overcurrent and short circuit faults. In this embodiment of the invention, visual confirmation of the cause of the trip is provided.Type: GrantFiled: August 1, 2000Date of Patent: April 24, 2001Assignee: General Electric CompanyInventors: Bhaskar T. Ramakrishnan, Roger Castonguay