US6289342B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Autonomous citation indexing and literature browsing using citation context
Assignee: NEC Corp
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Filing: 1998-05-20
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Granted: 2001-09-11
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Expires: 2018-05-20
Abstract
Abstract An autonomous citation indexing system which can be used as an assistant agent automates and enhances the task of finding publications in electronic form, including publications located on the world wide web. The system parses citations from papers and identifies citations to the same paper that may differ in syntax. The system also extracts and provides the context of citations to a given paper, allowing a researcher to determine what is published in other papers about a given paper. Common citations and word or string vector distance similarity are used to find related articles in a search.
Inventors
- 👤 Stephen R. Lawrence
- 👤 C. Lee Giles
- 👤 Kurt D. Bollacker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:42
CPC Classifications
G; G06; G06F; G06F16/00; G06F16/90; G06F16/95; G06F16/951; G06F16/30; G06F16/38; G06F16/382; G06F16/953; G06F16/9532; Y; Y10; Y10S; Y10S707/00; Y10S707/99931; Y10S707/99932; Y10S707/99933; Y10S707/99935; Y10S707/99936; Y10S707/99937; Y10S707/99941; Y10S707/99942; Y10S707/99943
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
97 words
A computer-implemented citation indexing system comprising: means for locating and acquiring publications in electronic format; a document parser for extracting semantic features, including citations, from acquired publications; and means for identifying citations to the same publication, where said means for identifying citations to the same publication normalizes citations, sorts citations by length and processes citations in order beginning with the longest length citation, computes distance measures to all previously identified groups of citations for each citation, and either adds the citation to an existing group or creates a new group, where said distance measure comprises word matching.
Claim 2
Dependent Claim
97 words
A computer-implemented citation indexing system comprising: means for locating and acquiring publications in electronic format; a document parser for extracting semantic features, including citations, from acquired publications; and means for identifying citations to the same publication, where said means for identifying citations to the same publication normalizes citations, sorts citations by length and processes citations in order beginning with the longest length citation, computes distance measures to all previously identified groups of citations for each citation, and either adds the citation to an existing group or creates a new group, where said distance measure comprises word matching.
Claim 3
Dependent Claim
99 words
A computer-implemented citation indexing system comprising: means for locating and acquiring publications in electronic format; a document parser for extracting semantic features, including citations, from acquired publications; and means for identifying citations to the same publication, where said means for identifying citations to the same publication normalizes citations, sorts citations by length and processes citations in order beginning with the longest length citation, computes distance measures to all previously identified groups of citations for each citation, and either adds the citation to an existing group or creates a new group, where said distance measure comprises word and phrase matching.
Claim 4
Dependent Claim
99 words
A computer-implemented citation indexing system comprising: means for locating and acquiring publications in electronic format; a document parser for extracting semantic features, including citations, from acquired publications; and means for identifying citations to the same publication, where said means for identifying citations to the same publication normalizes citations, sorts citations by length and processes citations in order beginning with the longest length citation, computes distance measures to all previously identified groups of citations for each citation, and either adds the citation to an existing group or creates a new group, where said distance measure comprises word and phrase matching.
Claim 5
Dependent Claim
110 words
A computer-implemented citation indexing system comprising: means for locating and acquiring publications in electronic format, where said publications in electronic format are publications on the world wide web; a document parser for extracting semantic features, including citations, from acquired publications; and means for identifying citations to the same publication, where said means for identifying citations to the same publication normalizes citations, sorts citations by length and processes citations in order beginning with the longest length citation, computes distance measures to all previously identified groups of citations for each citation, and either adds the citation to an existing group or creates a new group, where said distance measure comprises word matching.
Claim 6
Dependent Claim
110 words
A computer-implemented citation indexing system comprising: means for locating and acquiring publications in electronic format, where said publications in electronic format are publications on the world wide web; a document parser for extracting semantic features, including citations, from acquired publications; and means for identifying citations to the same publication, where said means for identifying citations to the same publication normalizes citations, sorts citations by length and processes citations in order beginning with the longest length citation, computes distance measures to all previously identified groups of citations for each citation, and either adds the citation to an existing group or creates a new group, where said distance measure comprises word matching.
Claim 7
Dependent Claim
112 words
A computer-implemented citation indexing system comprising: means for locating and acquiring publications in electronic format, where said publications in electronic format are publications on the world wide web; a document parser for extracting semantic features, including citations, from acquired publications; and means for identifying citations to the same publication, where said means for identifying citations to the same publication normalizes citations, sorts citations by length and processes citations in order beginning with the longest length citation, computes distance measures to all previously identified groups of citations for each citation, and either adds the citation to an existing group or creates a new group, where said distance measure comprises word and phrase matching.
Claim 8
Dependent Claim
112 words
A computer-implemented citation indexing system comprising: means for locating and acquiring publications in electronic format, where said publications in electronic format are publications on the world wide web; a document parser for extracting semantic features, including citations, from acquired publications; and means for identifying citations to the same publication, where said means for identifying citations to the same publication normalizes citations, sorts citations by length and processes citations in order beginning with the longest length citation, computes distance measures to all previously identified groups of citations for each citation, and either adds the citation to an existing group or creates a new group, where said distance measure comprises word and phrase matching.
Claim 9
Independent Claim
116 words
A method of computer-implemented citation indexing for identifying different forms of citations to the same publication comprising the steps of: searching for desired publications in electronic format; locating and acquiring the desired publications; parsing the acquired publications for extracting and storing semantic features, including citations, from the acquired publications; and identifying citations to the same publication, said identifying citations to the same publication comprising normalizing citations, sorting citations by length and processing citations in order beginning with the longest length citation, computing for each citation, distance measures to all previously identified groups of citations, and either adding the citation to an existing group or creating a new group, where said computing distance measures comprises word matching.
Claim 10
Independent Claim
116 words
A method of computer-implemented citation indexing for identifying different forms of citations to the same publication comprising the steps of: searching for desired publications in electronic format; locating and acquiring the desired publications; parsing the acquired publications for extracting and storing semantic features, including citations, from the acquired publications; and identifying citations to the same publication, said identifying citations to the same publication comprising normalizing citations, sorting citations by length and processing citations in order beginning with the longest length citation, computing for each citation, distance measures to all previously identified groups of citations, and either adding the citation to an existing group or creating a new group, where said computing distance measures comprises word matching.
Claim 11
Independent Claim
117 words
A method of computer-implemented citation indexing for identifying different forms of citations to the same publication comprising the steps of: searching for desired publications in electronic format; locating and acquiring the desired publications; parsing the acquired publications for extracting and storing semantic features, including citations, from the acquired publications; and identifying citations to the same publication, said identifying citations to the same publication comprising normalizing citations, sorting citations by length and processing citations in order beginning with the longest length, computing for each citation, distance measures to all previously identified groups of citations, and either adding the citation to an existing group or creating a new group, where said computing distance measures comprises word and phrase matching.
Claim 12
Independent Claim
117 words
A method of computer-implemented citation indexing for identifying different forms of citations to the same publication comprising the steps of: searching for desired publications in electronic format; locating and acquiring the desired publications; parsing the acquired publications for extracting and storing semantic features, including citations, from the acquired publications; and identifying citations to the same publication, said identifying citations to the same publication comprising normalizing citations, sorting citations by length and processing citations in order beginning with the longest length, computing for each citation, distance measures to all previously identified groups of citations, and either adding the citation to an existing group or creating a new group, where said computing distance measures comprises word and phrase matching.
Claim 13
Independent Claim
129 words
A method of computer-implemented citation indexing for identifying different forms of citations to the same publication comprising the steps of: searching for desired publications in electronic format, where said publications in electronic format are publications on the world wide web; locating and acquiring the desired publications; parsing the acquired publications for extracting and storing semantic features, including citations, from the acquired publications; and identifying citations to the same publication, said identifying citations to the same publication comprising normalizing citations, sorting citations by length and processing citations in order beginning with the longest length citation, computing for each citation, distance measures to all previously identified groups of citations, and either adding the citation to an existing group or creating a new group, where said computing distance measures comprises word matching.
Claim 14
Independent Claim
129 words
A method of computer-implemented citation indexing for identifying different forms of citations to the same publication comprising the steps of: searching for desired publications in electronic format, where said publications in electronic format are publications on the world wide web; locating and acquiring the desired publications; parsing the acquired publications for extracting and storing semantic features, including citations, from the acquired publications; and identifying citations to the same publication, said identifying citations to the same publication comprising normalizing citations, sorting citations by length and processing citations in order beginning with the longest length citation, computing for each citation, distance measures to all previously identified groups of citations, and either adding the citation to an existing group or creating a new group, where said computing distance measures comprises word matching.
Claim 15
Independent Claim
130 words
A method of computer-implemented citation indexing for identifying different forms of citations to the same publication comprising the steps of: searching for desired publications in electronic format, where said publications in electronic format are publications on the world wide web; locating and acquiring the desired publications; parsing the acquired publications for extracting and storing semantic features, including citations, from the acquired publications; and identifying citations to the same publication, said identifying citations to the same publication comprising normalizing citations, sorting citations by length and processing citations in order beginning with the longest length, computing for each citation, distance measures to all previously identified groups of citations, and either adding the citation to an existing group or creating a new group, where said computing distance measures comprises word and phrase matching.
Claim 16
Independent Claim
130 words
A method of computer-implemented citation indexing for identifying different forms of citations to the same publication comprising the steps of: searching for desired publications in electronic format, where said publications in electronic format are publications on the world wide web; locating and acquiring the desired publications; parsing the acquired publications for extracting and storing semantic features, including citations, from the acquired publications; and identifying citations to the same publication, said identifying citations to the same publication comprising normalizing citations, sorting citations by length and processing citations in order beginning with the longest length, computing for each citation, distance measures to all previously identified groups of citations, and either adding the citation to an existing group or creating a new group, where said computing distance measures comprises word and phrase matching.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-09-10 | 2005-03-12 | 2005-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-09-10 | 2009-03-12 | 2009-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-09-10 | 2013-03-12 | 2013-09-11 | $7700.00 | Window Closed / Lapsed |