Inventor

Chai Wah Wu

Inventor

Poughquag, NY, US

Overview

1999–2020

Patent span

Electricity

Primary field (CPC H)

Patents· 76 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

H04Nprimary

H04NPictorial communication, e.g. television37%

H04LTransmission of digital information, e.g. telegraphic communication9%

G06KGraphical data reading9%

G06TImage data processing or generation, in general9%

G06QInformation and communication technology [ict] specially adapted for administrative, commercial, financial, managerial or supervisory purposes5%

G06FElectric digital data processing3%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests3%

G06VImage or video recognition or understanding2%

G07CTime or attendance registers2%

G08GTraffic control systems2%

PatentTitleYear

10,707,996Error correcting codes with bayes decoder and optimized codebook2020 10,586,131Multimedia conferencing system for determining participant engagement2020 9,621,762'Halftone calibration mechanism employing an ink model'2017 9,614,998'Mechanism for generating a hybrid halftone using a DMSSA screen'2017 9,363,414'Halftone mechanism'2016 9,260,031'Distributed charging of electrical assets'2016 9,229,408'Toner Estimation Mechanism'2016 9,036,212'Halftone screen generation mechanism'2015 8,922,834'Hybrid halftone generation mechanism using change in pixel error'2014 8,922,802'Method and system for halftoning using energy minimization'2014 8,807,691'Print head alignment mechanism'2014 8,773,722'Hybrid halftone generation mechanism using change in pixel error'2014 8,693,054'Mask generation mechanism'2014 8,625,161'Multibit digital halftoning, indexing 2D and 3D lookup tables'2014 8,520,253'Method and system for scaling with dot gain control'2013 8,494,004'Resource allocation in peer-to-peer streaming'2013 8,282,182'Correction of print engine artifacts using an iterative halftoning search algorithm'2012 8,214,840'Optimization with unknown objective function'2012 8,200,982'Semiotic system and method with privacy protection'2012 8,108,537'Method and system for improving content diversification in data driven P2P streaming using source push'2012 7,848,355'Resource allocation in peer-to-peer streaming'2010 7,761,715'Semiotic system and method with privacy protection'2010 7,733,533'Generating threshold values in a dither matrix'2010 7,616,347'System and method for multi-bit halftoning'2009 7,599,097'Method and system for designing multilevel halftone screens using spot functions'2009 7,545,537'Bandless halftone design for multiple beam printers employing non-orthogonal halftones'2009 7,489,419'Method and system for specifying halftone spot shapes'2009 7,446,904'Methods and apparatus for generating dither mask through interpolation between preferred patterns'2008 7,433,856'Optimization with unknown objective function'2008 7,400,430'Detecting and compensating for color misregistration produced by a color scanner'2008 7,333,244'Method and system for embedding an image into two other images'2008 7,310,168'Method and apparatus for controlling a spot function for digital halftoning'2007 7,215,445'Method and apparatus to correct distortion of document copies'2007 7,188,258'Method and apparatus for producing duplication- and imitation-resistant identifying marks on objects, and duplication- and duplication- and imitation-resistant objects'2007 7,100,050'Secured signal modification and verification with privacy control'2006 7,006,254'Method and system for data hiding and authentication via halftoning and coordinate projection'2006 6,996,543'System for protection of goods against counterfeiting'2006 6,982,625'Event-recorder for transmitting and storing electronic signature data'2006 6,956,670'Method, system, program, and data structures for halftoning with line screens having different lines per inch (LPI)'2005 6,954,290'Method and apparatus to correct distortion of document copies'2005 6,907,527'Cryptography-based low distortion robust data authentication system and method therefor'2005 6,873,977'Achieving buyer-seller anonymity for unsophisticated users under collusion amongst intermediaries'2005 6,870,643'Method and system for error diffusion with a plurality of error measures'2005 6,834,344'Semi-fragile watermarks'2004 6,807,530'Method and apparatus for remote commerce with customer anonymity'2004 6,807,634'Watermarks for customer identification'2004 6,801,220'Method and apparatus for adjusting subpixel intensity values based upon luminance characteristics of the subpixels for improved viewing angle characteristics of liquid crystal displays'2004 6,737,954'Event-recorder for transmitting and storing electronic signature data'2004 6,738,162'Digital printer for avoiding moire patterns by using a dithering mask and angular rotation between print head and print medium to simulate analog printer halftoning of color images'2004 6,714,318'Dithering method and apparatus for multitone printers'2004 6,687,023'Data processing system and method for producing shifted-element halftone screens'2004 6,603,573'Constrained digital halftoning'2003 6,597,813'Masks with modulated clustering and aperiodicity and rescaling of masks'2003 6,564,322'Method and apparatus for watermarking with no perceptible trace'2003 6,525,672'Event-recorder for transmitting and storing electronic signature data'2003 6,515,770'Dither mask generation with calibration-independent number of threshold levels'2003 6,501,390'Method and apparatus for securely determining aspects of the history of a good'2002 6,450,403'Method and apparatus for depositing ordinary checks from home or office'2002 6,397,334'Method and system for authenticating objects and object data'2002 6,275,599'Compressed image authentication and verification'2001 6,256,736'Secured signal modification and verification with privacy control'2001 6,172,769'Printer dependent descreening method'2001 6,115,616'Hand held telephone set with separable keyboard'2000 6,101,001'Target patterns controlled error management'2000 6,088,123'Dithering masks with very large periods'2000 6,069,955'System for protection of goods against counterfeiting'2000 6,064,701'Synchronization-based communication systems'2000 6,055,065'Printer independent halftone image rendering'2000 6,028,907'System and method for three-dimensional geometric modeling by extracting and merging two-dimensional contours from CT slice data and CT scout data'2000 6,025,930'Multicell clustered mask with blue noise adjustments'2000 6,023,495'System and method for acquiring three-dimensional data subject to practical constraints by integrating CT slice data and CT scout images'2000 6,006,011'Target patterns controlled error management'1999 5,946,455'Model based error diffusion with correction propagation'1999 5,946,370'System and method for accessing the three-dimensional geometry of large objects using X-ray based method subject to limitations on radiation doses'1999 5,943,477'Microlocal calibration of digital printers'1999 5,917,951'Clustered aperiodic mask'1999

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1999–2020Patents assigned to IBM (57)· patent assignee history

1999–2004Based in Ossining, NY, US· patent location history

2002–2016Based in Poughquag, NY, US· patent location history

2005Based in Poughkeepsie, NY, US· patent location history

2007–2014Patents assigned to INFOPRINT SOLUTIONS CO LLC (10)· patent assignee history

2012–2017Patents assigned to WU CHAI WAH (15)· patent assignee history

2012–2017Patents assigned to CHANDU KARTHEEK (11)· patent assignee history

2012–2017Patents assigned to STANICH MIKEL J (10)· patent assignee history

2014–2020Based in Hopewell Junction, NY, US· patent location history

2014Based in Hawthorne, NY, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
IBM	57	1999–2020
WU CHAI WAHself	15	2012–2017
CHANDU KARTHEEK	11	2012–2017
INFOPRINT SOLUTIONS CO LLC	10	2007–2014
STANICH MIKEL J	10	2012–2017

Locations

Location	Patents	Span
Poughquag, New York, US	43	2002–2016
Ossining, New York, US	18	1999–2004
Hopewell Junction, New York, US	12	2014–2020
Hawthorne, New York, US	1	2014
Poughkeepsie, New York, US	1	2005