Granted Patent
B2
US 12,718,308 · App. 18/667,990 · Granted Aug 25, 2026
Systems and methods of tracking chain of custody of documents
View Patent ↗
Loading inventors, assignments & file history…
Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Jan 15, 2026
From: OPEN TEXT HOLDINGS, INC.
To: OPEN TEXT INC.
Reel/Frame 074362/0745 →
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Aug 18, 2025
From: KROVVIDI, SHIVA SRI SANTOSHA PHANI KRISHNA
To: OPEN TEXT HOLDINGS, INC.
Reel/Frame 072051/0072 →
Continuity (4)
Provisional Application
62797084
· Jan 25, 2019
References Cited (170)
US 5826257A
· Snelling, Jr.
· 1998
[cited by applicant]
US 5862325A
· Reed et al.
· 1999
[cited by applicant]
US 5950196A
· Pyreddy et al.
· 1999
[cited by applicant]
US 6014680A
· Sato et al.
· 2000
[cited by applicant]
US 6222530B1
· Sequeira
· 2001
[cited by applicant]
US 6233575B1
· Agrawal et al.
· 2001
[cited by applicant]
US 6539375B2
· Kawasaki
· 2003
[cited by applicant]
US 6546385B1
· Mao et al.
· 2003
[cited by applicant]
US 6694329B2
· Murray
· 2004
[cited by applicant]
US 6757710B2
· Reed
· 2004
[cited by applicant]
US 6999962B2
· Julliard et al.
· 2006
[cited by applicant]
US 7143089B2
· Petras et al.
· 2006
[cited by applicant]
US 7747631B1
· Puzicha et al.
· 2010
[cited by applicant]
US 7890533B2
· Pollara
· 2011
[cited by applicant]
US 7949629B2
· Pollara
· 2011
[cited by applicant]
US 7958164B2
· Ivanov et al.
· 2011
[cited by applicant]
US 7996211B2
· Gao et al.
· 2011
[cited by applicant]
US 8010341B2
· Achan et al.
· 2011
[cited by applicant]
US 8024333B1
· Puzicha et al.
· 2011
[cited by applicant]
US 8103678B1
· Puzicha et al.
· 2012
[cited by applicant]
US 8140323B2
· Johnson et al.
· 2012
[cited by applicant]
US 8204738B2
· Skuratovsky
· 2012
[cited by applicant]
US 8266148B2
· Guha et al.
· 2012
[cited by applicant]
US 8306922B1
· Kunal et al.
· 2012
[cited by applicant]
US 8311950B1
· Kunal et al.
· 2012
[cited by applicant]
US 8429159B1
· Puzicha et al.
· 2013
[cited by applicant]
US 8433558B2
· Bangalore et al.
· 2013
[cited by applicant]
US 8443013B1
· Lin et al.
· 2013
[cited by applicant]
US 8566897B2
· Sequeira
· 2013
[cited by applicant]
US 8589394B2
· Vignet
· 2013
[cited by applicant]
US 8589419B2
· Puzicha et al.
· 2013
[cited by applicant]
US 8856642B1
· Riediger et al.
· 2014
[cited by applicant]
US 8943397B2
· Palleschi et al.
· 2015
[cited by applicant]
US 8965886B2
· Puzicha et al.
· 2015
[cited by applicant]
US 9122729B2
· Love
· 2015
[cited by examiner]
US 9146916B2
· Moroze
· 2015
[cited by applicant]
US 9495347B2
· Stadermann et al.
· 2016
[cited by applicant]
US 20010014852A1
· Tsourikov et al.
· 2001
[cited by applicant]
US 20020040375A1
· Simon et al.
· 2002
[cited by applicant]
US 20020095454A1
· Reed et al.
· 2002
[cited by applicant]
US 20020099714A1
· Murray
· 2002
[cited by applicant]
US 20020103834A1
· Thompson et al.
· 2002
[cited by applicant]
US 20020107853A1
· Hofmann et al.
· 2002
[cited by applicant]
US 20020194026A1
· Klein et al.
· 2002
[cited by applicant]
US 20030018668A1
· Britton et al.
· 2003
[cited by applicant]
US 20030191727A1
· Yao et al.
· 2003
[cited by applicant]
US 20030200533A1
· Roberts et al.
· 2003
[cited by applicant]
US 20030217052A1
· Rubenczyk et al.
· 2003
[cited by applicant]
US 20030229854A1
· Lemay
· 2003
[cited by applicant]
US 20040193520A1
· LaComb et al.
· 2004
[cited by applicant]
US 20060010029A1
· Gross
· 2006
[cited by applicant]
US 20070214010A1
· Beaver et al.
· 2007
[cited by applicant]
US 20080172597A1
· DeHaan
· 2008
[cited by applicant]
US 20090013246A1
· Cudich et al.
· 2009
[cited by applicant]
US 20100138894A1
· Kyojima
· 2010
[cited by applicant]
US 20100241451A1
· Gatt
· 2010
[cited by examiner]
US 20110047166A1
· Stading et al.
· 2011
[cited by applicant]
US 20130117012A1
· Orlin et al.
· 2013
[cited by applicant]
US 20140052755A1
· Pitman et al.
· 2014
[cited by applicant]
US 20150254791A1
· Stockton et al.
· 2015
[cited by applicant]
US 20150286636A1
· Elkhou et al.
· 2015
[cited by applicant]
US 20150324338A1
· Levy et al.
· 2015
[cited by applicant]
US 20210397522A1
· Owen
· 2021
[cited by examiner]
EP 2590117A1
· 2013
[cited by applicant]
EP 3734489A1
· 2020
[cited by applicant]
EP 3734489A4
· 2021
[cited by examiner]
WO WO2002027542A1
· 2002
[cited by applicant]
WO WO2012030954A1
· 2012
[cited by applicant]
Cooper et al., OBIWAN-a visual interface for prompted query refinement, Jan. 6-9, 1998, IEEE, Vo1.2, 277-285.
[cited by applicant]
Xu et al., Query expansion using local and global document analysis, Aug. 1996, ACM, 4-11.
[cited by applicant]
Grewal et al., A Visual Representation of Search-Engine Queries and Their Results, IEEE, vol. 1, pp. 352-356, 2000.
[cited by applicant]
Lelescu, Ana et al., “Approximate Retrieval from Multimedia Databases Using Relevance Feedback,” 1999, IEEE, 215-223.
[cited by applicant]
Cui, Hang et al., “Query Expansion by Mining User Logs,” Jul./Aug. 2003, vol. 15, No. 4, 829-839.
[cited by applicant]
Pyreddy, Pallavi, et al., “Tintin: A system for retrieval in text tables”, Proceedings of the second ACM international conference on Digital libraries. ACM, 1997, 12 pages.
[cited by applicant]
Pinto, David, et al., “Table extraction using conditional random fields”, Proceedings of the 26th annual international ACM SIGIR conference on Research and development in information retrieval. ACM, 2003, 8 pages.
[cited by applicant]
Chen, Hsin-Hsi, et al., “Mining tables from large scale HTML texts”, Proceedings of the 18th conference on Computational linguistics—vol. 1, Association for Computational Linguistics, 2000, 7 pages.
[cited by applicant]
Tengli, Ashwin, et al., “Learning table extraction from examples,” Proceedings of the 20th international conference on Computational Linguistics, Association for Computational Linguistics, 2004, 7 pages.
[cited by applicant]
Gatterbauer, Wolfgang, et al., “Table extraction using spatial reasoning on the CSS2 visual box model” Proceedings of the National Conference on Artificial Intelligence. vol. 21. No. 2, Menlo Park, CA; Cambridge, MA; Lo…
[cited by applicant]
Liu, Ying, et al., “Tableseer: automatic table metadata extraction and searching in digital libraries”, Proceedings of the 7th ACM/IEEE-CS joint conference on Digital libraries, ACM, 2007, 10 pages.
[cited by applicant]
Liu, Ying, et al., “Improving the table boundary detection in pdfs by fixing the sequence error of the sparse lines”, Document Analysis and Recognition, 2009, ICDAR'09, 10th International Conference on IEEE, 2009, 5 pag…
[cited by applicant]
Yildiz, Burcu, et al., “pdf2table: A method to extract table information from pdf files.” 2nd Indian Int. Conf. on AI, Pune. 2005, 13 pages.
[cited by applicant]
RecoStar OCR Solution Open Text Corp., Waterloo, ON, Canada; http://www.opentext.com, accessed Oct. 29, 2013, 4 pages.
[cited by applicant]
Omnipage, Nuance Communications, Inc., Burlington, Mass., USA; <http://www.nuance.com/for-business/by-product/omnipage/index.htm> accessed Oct. 29, 2013, 3 pages.
[cited by applicant]
Lerman et al., Using the Structure of Web Sites for Automatic Segmentation of Tables, ACM 2004, pp. 119-130, 12 pages.
[cited by applicant]
Silva et al., Design of an End-to-end Method to Extract Information from Tables, Google 2006, pp. 144-171.
[cited by applicant]
Begum et al. A Greedy approach for computing longest common subsequences. 2008. [retrieved on Jan. 22, 2014] Retrieved from the Internet: <http://www.sms.edu.pk/journals/jprm/jprmvol4/jprm9_4.pdfl>, 6 pages.
[cited by applicant]
Kondrak et al. N-gram similarity and distance. 2005. [retrieved on Jan. 22, 2014] Retrieved from the Internet: <http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.67.9369&rep=rep1&type=pdf>, 13 pages.
[cited by applicant]
Wang et al., Data Extraction and Label Assignment for Web Database, ACM 2003, pp. 187-196.
[cited by applicant]
Shafait et al., Table Detection in Heterogeneous Documents, ACM 2010, pp. 65-72.
[cited by applicant]
Eberius et al., Building the Dresden Web Table Corpus: A Classification Approach, IEEE 2015, pp. 41-50.
[cited by applicant]
Wenzel et al., An Approach to Context0driven Document Analysis and Understanding, Google 2003, pp. 1-12.
[cited by applicant]