Patents by Inventor Joel Chan
Joel Chan 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: 10532555Abstract: In one aspect, methods of printing a color 3D article are described herein. In some embodiments, a method described herein comprises receiving data representing a surface colorization of the article, and transforming the data representing the surface colorization of the article into voxel data of the article. The voxel data comprises (a) location values and at least one of (b) color values and (c) transparency values for a plurality of columns of voxels normal or substantially normal to a surface of the article. The method further comprises selectively depositing layers of one or more build materials onto a substrate to form the article in accordance with the voxel data. In addition, at least one column of the plurality of columns of voxels exhibits a surface color resulting from a combination of colors of a plurality of voxels of the column.Type: GrantFiled: March 6, 2018Date of Patent: January 14, 2020Assignee: 3D Systems, Inc.Inventors: Joel Chan, Mark R. Parker, Edward Sheufelt, Jule W. Thomas, Jr., Dong Hoon Lee
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Publication number: 20180194127Abstract: In one aspect, methods of printing a color 3D article are described herein. In some embodiments, a method described herein comprises receiving data representing a surface colorization of the article, and transforming the data representing the surface colorization of the article into voxel data of the article. The voxel data comprises (a) location values and at least one of (b) color values and (c) transparency values for a plurality of columns of voxels normal or substantially normal to a surface of the article. The method further comprises selectively depositing layers of one or more build materials onto a substrate to form the article in accordance with the voxel data. In addition, at least one column of the plurality of columns of voxels exhibits a surface color resulting from a combination of colors of a plurality of voxels of the column.Type: ApplicationFiled: March 6, 2018Publication date: July 12, 2018Inventors: Joel Chan, Mark R. Parker, Edward Sheufelt, Jule W. Thomas, JR., Dong Hoon Lee
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Patent number: 9975323Abstract: In one aspect, methods of printing a color 3D article are described herein. In some embodiments, a method described herein comprises receiving data representing a surface colorization of the article, and transforming the data representing the surface colorization of the article into voxel data of the article. The voxel data comprises (a) location values and at least one of (b) color values and (c) transparency values for a plurality of columns of voxels normal or substantially normal to a surface of the article. The method further comprises selectively depositing layers of one or more build materials onto a substrate to form the article in accordance with the voxel data. In addition, at least one column of the plurality of columns of voxels exhibits a surface color resulting from a combination of colors of a plurality of voxels of the column.Type: GrantFiled: March 11, 2015Date of Patent: May 22, 2018Assignee: 3D Systems, Inc.Inventors: Joel Chan, Mark R. Parker, Edward Sheufelt, Jule W. Thomas, Jr., Dong Hoon Lee
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Publication number: 20150258770Abstract: In one aspect, methods of printing a color 3D article are described herein. In some embodiments, a method described herein comprises receiving data representing a surface colorization of the article, and transforming the data representing the surface colorization of the article into voxel data of the article. The voxel data comprises (a) location values and at least one of (b) color values and (c) transparency values for a plurality of columns of voxels normal or substantially normal to a surface of the article. The method further comprises selectively depositing layers of one or more build materials onto a substrate to form the article in accordance with the voxel data. In addition, at least one column of the plurality of columns of voxels exhibits a surface color resulting from a combination of colors of a plurality of voxels of the column.Type: ApplicationFiled: March 11, 2015Publication date: September 17, 2015Inventors: Joel CHAN, Mark R. PARKER, Edward SHEUFELT, Jule W. THOMAS, JR., Donghoon LEE
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Patent number: 8985723Abstract: A method of compensating for a defective inkjet in an inkjet printer has been developed. A controller identifies pixels in binary image data corresponding to the defective inkjet. The controller identifies alternative pixel locations for non-defective inkjets to print ink drops proximate to the locations of the defective pixels. When an overlap parameter value identified between ink drops in alternative pixel locations and other ink drops around the alternative pixel locations exceeds a predetermined value, the controller changes the alternative pixel location for at least one ink drop to reduce overlap and improve image quality.Type: GrantFiled: April 20, 2012Date of Patent: March 24, 2015Assignee: Xerox CorporationInventors: David Jon Metcalfe, Joel Chan
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Patent number: 8955937Abstract: In an inkjet printer, a method for compensating for an inoperable inkjet includes identifying a density of image data in a region having a predetermined length in a process direction and at least one pixel corresponding to the inoperable inkjet. One other inkjet in the printer is operated to print ink drops onto an image receiving surface at a plurality of locations corresponding to the plurality of activated pixels for the inoperable inkjet in response to the identified density for the region exceeding a predetermined density threshold.Type: GrantFiled: July 23, 2012Date of Patent: February 17, 2015Assignee: Xerox CorporationInventors: David Jon Metcalfe, Joel Chan
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Patent number: 8882223Abstract: A method of indirect printing has been developed to split printing of an imaging revolution on the image drum. A portion of the image is printed on the drum corresponding from an intermediate edge to a trailing edge of image data, and subsequently a remaining portion is printed corresponding from a leading edge to the intermediate edge of the image data. Splitting the image revolution enables the imaging to begin earlier in the drum revolution and decreases the total number of revolutions needed to complete a printed page, increasing printer throughput.Type: GrantFiled: July 31, 2012Date of Patent: November 11, 2014Assignee: Xerox CorporationInventors: Walter Sean Harris, Joel Chan
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Publication number: 20140035980Abstract: A method of indirect printing has been developed to split printing of an imaging revolution on the image drum. A portion of the image is printed on the drum corresponding from an intermediate edge to a trailing edge of image data, and subsequently a remaining portion is printed corresponding from a leading edge to the intermediate edge of the image data. Splitting the image revolution enables the imaging to begin earlier in the drum revolution and decreases the total number of revolutions needed to complete a printed page, increasing printer throughput.Type: ApplicationFiled: July 31, 2012Publication date: February 6, 2014Applicant: XEROX CORPORATIONInventors: Walter Sean Harris, Joel Chan
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Publication number: 20140022295Abstract: In an inkjet printer, a method for compensating for an inoperable inkjet includes identifying a density of image data in a region having a predetermined length in a process direction and at least one pixel corresponding to the inoperable inkjet. One other inkjet in the printer is operated to print ink drops onto an image receiving surface at a plurality of locations corresponding to the plurality of activated pixels for the inoperable inkjet in response to the identified density for the region exceeding a predetermined density threshold.Type: ApplicationFiled: July 23, 2012Publication date: January 23, 2014Applicant: XEROX CORPORATIONInventors: David Jon Metcalfe, Joel Chan
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Publication number: 20130278658Abstract: A method of compensating for a defective inkjet in an inkjet printer has been developed. A controller identifies pixels in binary image data corresponding to the defective inkjet. The controller identifies alternative pixel locations for non-defective inkjets to print ink drops proximate to the locations of the defective pixels. When an overlap parameter value identified between ink drops in alternative pixel locations and other ink drops around the alternative pixel locations exceeds a predetermined value, the controller changes the alternative pixel location for at least one ink drop to reduce overlap and improve image quality.Type: ApplicationFiled: April 20, 2012Publication date: October 24, 2013Applicant: XEROX CORPORATIONInventors: David Jon Metcalfe, Joel Chan
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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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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: 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: 7859691Abstract: A process enables a user to alter all the operational modes of a printer through a single parameter selection. The process includes selecting a group of operational parameter sets for a print process, the group selection being made with reference to one of an operational mode and a characteristic parameter; and selecting a set of operational parameters from the selected group of operational parameter sets, the set selection being made with reference to the other of the operational mode and the characteristic parameter.Type: GrantFiled: June 2, 2006Date of Patent: December 28, 2010Assignee: Xerox CorporationInventors: Trevor James Snyder, Cheng-Sung (Joel) Chan, Walter Sean Harris, Paul Jeremy Woodward, Shell Thomas Haffner, James B. Campbell
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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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Patent number: 7588305Abstract: A dual-drop mode for a printer uses at least two full length waveforms and switches between the waveforms according to one or more patterning methodologies to print a page length document having a dual drop size print pattern across the printed portion of the page. This achieves printing from individual jet nozzles of either a large drop or a small drop. The page size patterning methodology is performed globally on at least a sub-page basis, rather than on a pixel-by-pixel basis and may be performed based on or independent of specific image data.Type: GrantFiled: May 31, 2005Date of Patent: September 15, 2009Assignee: Xerox CorporationInventors: David L. Knierim, Trevor J. Snyder, Joel Chan
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Patent number: 7575293Abstract: A dual-drop mode for a printer uses at least two full length waveforms and switches between the waveforms according to one or more patterning methodologies to print a page length document having a dual drop size print pattern across the printed portion of the page. This achieves printing from individual jet nozzles of either a large drop or a small drop. The page size patterning methodology is performed globally on at least a sub-page basis, rather than on a pixel-by-pixel basis and may be performed based on or independent of specific image data. In exemplary embodiments, printing is achieved using multiple print passes, with at least two print passes using different sized ink droplets.Type: GrantFiled: May 31, 2005Date of Patent: August 18, 2009Assignee: Xerox CorporationInventors: Trevor J. Snyder, David L. Knierim, Joel Chan
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Publication number: 20070279665Abstract: A process enables a user to alter all the operational modes of a printer through a single parameter selection. The process includes selecting a group of operational parameter sets for a print process, the group selection being made with reference to one of an operational mode and a characteristic parameter; and selecting a set of operational parameters from the selected group of operational parameter sets, the set selection being made with reference to the other of the operational mode and the characteristic parameter.Type: ApplicationFiled: June 2, 2006Publication date: December 6, 2007Inventors: Trevor James Snyder, Cheng-Sung (Joel) Chan, Walter Sean Harris, Paul Jeremy Woodward, Shell Thomas Haffner, James B. Campbell
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Publication number: 20060268036Abstract: A dual-drop mode for a printer uses at least two full length waveforms and switches between the waveforms according to one or more patterning methodologies to print a page length document having a dual drop size print pattern across the printed portion of the page. This achieves printing from individual jet nozzles of either a large drop or a small drop The page size patterning methodology is performed globally on at least a sub-page basis, rather than on a pixel-by-pixel basis and may be performed based on or independent of specific image data.Type: ApplicationFiled: May 31, 2005Publication date: November 30, 2006Applicant: XEROX CORPORATIONInventors: David Knierim, Trevor Snyder, Joel Chan
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Publication number: 20060268031Abstract: A dual-drop mode for a printer uses at least two full length waveforms and switches between the waveforms according to one or more patterning methodologies to print a page length document having a dual drop size print pattern across the printed portion of the page. This achieves printing from individual jet nozzles of either a large drop or a small drop. The page size patterning methodology is performed globally on at least a sub-page basis, rather than on a pixel-by-pixel basis and may be performed based on or independent of specific image data. In exemplary embodiments, printing is achieved using multiple print passes, with at least two print passes using different sized ink droplets.Type: ApplicationFiled: May 31, 2005Publication date: November 30, 2006Applicant: XEROX CORPORATIONInventors: Trevor Snyder, David Knierim, Joel Chan