Patents by Inventor Shirish Padmakar Mulay
Shirish Padmakar Mulay 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: 8070259Abstract: A micro-fluid ejection head assembly having improved assembly characteristics and methods of manufacturing a micro-fluid ejection head assembly. The micro-fluid ejection head includes a fluid supply body having at least one fluid supply port in a recessed area therein. A reinforcing member circumscribes the fluid supply port. A micro-fluid ejection head is attached with an adhesive to the supply body in the recessed area so that cracking of the ejection head during adhesive curing is substantially reduced.Type: GrantFiled: September 12, 2007Date of Patent: December 6, 2011Assignee: Lexmark International, Inc.Inventors: Shirish Padmakar Mulay, Bhaskar Ramakrishnan
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Patent number: 7976115Abstract: A method for determining the pulse width for driving printhead nozzles in a thermal inkjet printer. The printhead is preheated to a desired temperature during a maintenance mode. The printhead nozzle heaters are successively driven in respective heating intervals, where each successive heating interval is characterized by shorter drive pulse width pulses occurring at a higher pulse frequency. The printhead temperature data received during each heating interval is processed to determine a respective temperature slope. The temperature slopes are compared to a desired threshold temperature slope, and when a match is found, the pulse width associated with the matched temperature slope is used to drive the nozzle heaters during subsequent printer operations to print characters on a print medium.Type: GrantFiled: December 31, 2008Date of Patent: July 12, 2011Assignee: Lexmark International, Inc.Inventors: Bruce David Gibson, Shirish Padmakar Mulay, Nicholas Jon Post, Ramkumar Singh Sankar Singh
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Patent number: 7784918Abstract: Micro-fluid ejection heads and methods for extending the life of micro-fluid ejection heads. One such micro-fluid ejection head includes a substrate having a plurality of thermal ejection actuators. Each of the thermal ejection actuators has a resistive layer and a protective layer thereon. A flow feature member is adjacent the substrate and defines a fluid feed channel, a fluid chamber associated with at least one of the actuators and in flow communication with the fluid feed channel, and a nozzle. The nozzle is offset to a side of the chamber opposite the feed channel. A polymeric layer having a degradation temperature of less than about 400° C. overlaps a portion of the at least one actuator associated with the fluid chamber and positioned less than about five microns from at least an edge of the at least one actuator opposite the fluid feed channel.Type: GrantFiled: June 25, 2008Date of Patent: August 31, 2010Assignee: Lexmark International, Inc.Inventors: Robert W. Cornell, James Harold Powers, Shirish Padmakar Mulay, Robert L. Cornell
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Publication number: 20100165029Abstract: A method for determining the pulse width for driving printhead nozzles in a thermal inkjet printer. The printhead is preheated to a desired temperature during a maintenance mode. The printhead nozzle heaters are successively driven in respective heating intervals, where each successive heating interval is characterized by shorter drive pulse width pulses occurring at a higher pulse frequency. The printhead temperature data received during each heating interval is processed to determine a respective temperature slope.Type: ApplicationFiled: December 31, 2008Publication date: July 1, 2010Inventors: Bruce David Gibson, Shirish Padmakar Mulay, Nicholas Jon Post, Ramkumar Singh Sankar Singh
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Publication number: 20090066759Abstract: A micro-fluid ejection head assembly having improved assembly characteristics and methods of manufacturing a micro-fluid ejection head assembly. The micro-fluid ejection head includes a fluid supply body having at least one fluid supply port in a recessed area therein. A reinforcing member circumscribes the fluid supply port. A micro-fluid ejection head is attached with an adhesive to the supply body in the recessed area so that cracking of the ejection head during adhesive curing is substantially reduced.Type: ApplicationFiled: September 12, 2007Publication date: March 12, 2009Inventors: Shirish Padmakar Mulay, Bhaskar Ramakrishnan
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Publication number: 20080259131Abstract: Micro-fluid ejection heads and methods for extending the life of micro-fluid ejection heads. One such micro-fluid ejection head includes a substrate having a plurality of thermal ejection actuators. Each of the thermal ejection actuators has a resistive layer and a protective layer thereon. A flow feature member is adjacent the substrate and defines a fluid feed channel, a fluid chamber associated with at least one of the actuators and in flow communication with the fluid feed channel, and a nozzle. The nozzle is offset to a side of the chamber opposite the feed channel. A polymeric layer having a degradation temperature of less than about 400° C. overlaps a portion of the at least one actuator associated with the fluid chamber and positioned less than about five microns from at least an edge of the at least one actuator opposite the fluid feed channel.Type: ApplicationFiled: June 25, 2008Publication date: October 23, 2008Applicant: LEXMARK INTERNATIONAL, INC.Inventors: Robert W. CORNELL, James Harold POWERS, Shirish Padmakar MULAY, Robert L. CORNELL
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Patent number: 7413289Abstract: Micro-fluid ejection heads and methods for extending the life of micro-fluid ejection heads. One such micro-fluid ejection head includes a substrate having a plurality of thermal ejection actuators. Each of the thermal ejection actuators has a resistive layer and a protective layer thereon. A flow feature member is adjacent the substrate and defines a fluid feed channel, a fluid chamber associated with at least one of the actuators and in flow communication with the fluid feed channel, and a nozzle. The nozzle is offset to a side of the chamber opposite the feed channel. A polymeric layer having a degradation temperature of less than about 400° C. overlaps a portion of the at least one actuator associated with the fluid chamber and positioned less than about five microns from at least an edge of the at least one actuator opposite the fluid feed channel.Type: GrantFiled: December 23, 2005Date of Patent: August 19, 2008Assignee: Lexmark International, Inc.Inventors: Robert W. Cornell, James Harold Powers, Shirish Padmakar Mulay, Robert L. Cornell
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Patent number: 6398333Abstract: The invention provides a printing apparatus for printing an image having a spatial resolution onto a print medium. The printing apparatus includes a printhead having a plurality of printing elements for ejecting ink droplets having a mass onto the print medium, and a temperature sensor for sensing a temperature of the printhead, producing a temperature signal. The apparatus also includes a media sensor for determining what type of print medium is loaded in the printer and producing a print medium signal based on the type of print medium installed in the printer. A plurality of heating devices are located adjacent the printhead for adjusting the temperature the printhead.Type: GrantFiled: August 9, 2000Date of Patent: June 4, 2002Assignee: Lexmark International, IncInventors: Shirish Padmakar Mulay, Duane Edward Norris, Julie Ann Gordon Whitney, Agnes Kam Zimmer
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Patent number: 6357863Abstract: An ink jet print head includes a nozzle plate having a substantially linear array of ink jet nozzles through which ink droplets are ejected toward a print medium. An integrated circuit chip, which is disposed adjacent the nozzle plate on the print head, includes a semiconductor substrate, a source voltage conductor connected to a source voltage, and a ground return conductor. A substantially linear array of ink heating resistors are disposed on the substrate substantially parallel to the length of the chip, each associated with a corresponding one of the ink jet nozzles. The chip also includes a plurality of substrate heater resistors disposed on the substrate in a substantially linear arrangement and aligned substantially parallel with the nozzles. The substrate heater resistors are electrically connected in parallel, with one node of each being connected to the source voltage conductor and another node of each being connected to the ground return conductor.Type: GrantFiled: December 2, 1999Date of Patent: March 19, 2002Assignee: Lexmark International Inc.Inventors: Frank Edward Anderson, Shirish Padmakar Mulay, George Keith Parish
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Patent number: 6247779Abstract: A printhead comprises a source of ink, a body, a mounting base, and an ink heater thermally coupled to the mounting base. A flowpath delivers ink from the ink source to the heater and is defined at least in part by the mounting base on the body. Three or more thermally conductive paths extend from the mounting base to the body. Preferably, one or more of the thermally conductive paths are heat conductive bridges extending from the mounting base to the body through an edge feed via.Type: GrantFiled: July 30, 1999Date of Patent: June 19, 2001Assignee: Lexmark International, Inc.Inventors: Ronald Monroe Nowell, Jr., David Amos Ward, Michael David Lattuca, Michael Raulinaitis, Shirish Padmakar Mulay