# Patent

## Title
Methods and data structures for improved searchable formatted documents including citation and corpus generation

## Abstract

Computer searchable annotated formatted documents are produced by correlating documents stored as a photographic or scanned graphic representations of an actual document (evidence, report, court order, etc.) with textual version of the same documents. A produced document will provide additional details in a computer data structure that supports citation annotation as well as other types of analysis of a document. The computer data structure also supports generation of citation reports and corpus reports. A computer method of creating searchable annotated formatted documents including citation and corpus reports by correlating and correcting text files with photographic or scanned graphic of the original documents. Data structures for correlating and correcting text files with graphic images. Generation of citation reports, concordance reports, and corpus reports. Data structures for citation reports, concordance reports, and corpus reports generation.

## Background
RELATED APPLICATION
This application claims priority under 35 U.S.C. §199(e) of the U.S. provisional application Ser. No. 61/192169, filed Sep. 16, 2008, entitled “METHODS AND DATA STRUCTURES FOR IMPROVED SEARCHABLE FORMATTED DOCUMENTS INCLUDING CITATION AND CORPUS GENERATION,” which is hereby incorporated by reference.


FIELD OF THE INVENTION
This invention relates to improved searchable formatted electronic documents and analysis tools, such as citation and corpus generation. Examples of documents include patents, patent applications, evidence files, and other documents which are available in graphic form and optionally also available in a text form.
BACKGROUND OF THE INVENTION
In the field of electronic document management there are many situations where a document is stored electronically on a computer system as a photographic or scanned graphic of the actual document. For example, in a litigation document management system example documents may represent evidence, reports, court orders, patent documents, etc. The graphic image of the page is critical in many cases and needs to be preserved. However, there is also a need to electronically search the document using a computer. Additionally, there has been a long felt need to be able to cut the text from a document and have an accurate internal citation, or location identification, automatically pasted into a new document (e.g. report, brief, etc.) with the text that was cut. In litigation, having analysis, reports, and arguments error free is very important and a significant amount of time spent creating quotes and internal citations and then in checking them to ensure accuracy.
What is needed is a way to analyze documents in its graphic format and then be able to generate quotations with accurate internal citations using a computer. Also in patent analysis, for example, what also is needed is a way to thoroughly review all occurrences of certain terms in context to be able to thoroughly and accurately determine the meaning of those terms.
SUMMARY OF THE INVENTION
The current invention provides the ability to produce computer searchable annotated formatted documents by correlating documents stored as a photographic or scanned graphic representations of an actual document (evidence, report, court order, etc.) with textual version of the same documents. A produced document will provide additional details using computer data structure(s) that would support the above described citation annotation as well as other types of analysis of a document. The data structure(s) also support computer generation of citation and corpus reports.
Objects and Advantages
Accordingly, beside the objects and advantages described above, some additional objects and advantages of the present invention are:

    1. To provide a quicker and more effective method analyzing documents.
    2. To provide a highly accurate, electronically searchable document from graphic images of the document pages.
    3. To provide means and methods of document analysis that are easy to use.
    4. To reduce the cost of document analysis.
    5. To reduce the cost of evidence analysis.
    6. To improve the thoroughness of documents analysis.
    7. To improve the thoroughness of patent claim term analysis.
    8. To identify inconsistencies in the use of document terms, e.g. usage of disputed patent claim terms.





BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1A illustrates a process by which remote documents are obtained and collected and then subsequently converted to other formats.
FIG. 1B illustrates a process by which a searchable annotated formatted document is produced.
FIG. 2A illustrates data structures that are used to verify, correlate and correct meta-data data, for example, patent OCR data.
FIG. 2B illustrates an embodiment of a text data structure.
FIG. 2C illustrates an embodiment of a meta-data data structure.
FIG. 3A illustrates a text parse routine.
FIG. 3B illustrates a searchable formatted document parse routine.
FIG. 4 illustrates a correlate and correct routine.
FIG. 5 illustrates an annotation routine.
FIG. 6 illustrates generation of a concordance.
FIG. 7A illustrates generation of a word corpus.
FIG. 7B illustrates an embodiment of word corpus.
FIG. 8A illustrates the generation of a citation report.
FIG. 8B illustrates an embodiment of a citation report.



REFERENCE NUMERALS IN DRAWINGS
















 1
local computer



 2
network



 3
remote computer



 4
network accessible file collection



 5
converted file



 6
output device



 10
graphic images



 20
text file



 30
formatted document



 40
searchable formatted document



 50
corrected formatted document



 60
searchable annotated formatted




document



 62
parse routine



 64
correlate and correct routine



 66
attach data routine



 68
tag words and sentences routine



 71
relative fields



 72
citation fields



 73
part fields



 74
section fields



 75
text for sentences fields



 76
doc ID field



 80
text field



 81
sequential paragraph number



 82
sequential sentence number



 83
new paragraph start



 84
citation start column # field



 85
citation start line # field



 86
citation start word # field



 87
citation end column # field



 88
citation end line # field



 89
citation end word # field



 90
part field



 91
section field



 92
specification part



 98
doc ID field



102
OCR page #



104
OCR column #



106
OCR line #



108
OCR line coordinates



110
OCR new paragraph start



112
OCR line font size



114
OCR line text



116
OCR line top coordinate



118
OCR line bottom coordinate



120
OCR line left coordinate



122
OCR line right coordinate



200
data structure(s)



200 a
first (text) data structure



200 b
second (meta-data) data structure



302
read text



304
determine document parts



306
determine document sections



308
determine new paragraphs



310
determine paragraph types



312
apply relative numbers to each




section



314
read text output



316
determine parts output



318
determine sections output



320
determine new paragraph output



322
determine paragraph type output



324
re-apply relative numbers to each




section



326
read searchable formatted




document



328
assemble lines



330
allocate lines to columns



332
calculate line numbers



334
read searchable formatted




document output



336
assemble lines output



338
allocate lines to columns output



402
read text file



404
read searchable formatted




document



406
match text



408
determine column line and word




values



410
contains figures?



412
determine figure # and item #



414
contains claims?



416
determine claim and clause #



420
read text file output



422
read searchable formatted




document output



424
match text output



426
determine column line and word




values output



428
determine figure # and item #




output



600
concordance program



602
concordance



700
corpus program



702
word or phrase corpus



710
prior content column



712
word (or phrase) column



714
subsequent content column



716
citation column



720
heading row



722
corpus sample row 1



724
corpus sample row 2



728
corpus last sample row



800
citation program



802
citation document



804
citation document title



810 (a-d)
citation document section title



812 (a-d)
citation sentence



814 (a-d)
citation annotation










SPECIAL DEFINITIONS
corpus—a collection of recorded statements used as a basis for the descriptive analysis of language in a written document
concordance—an index of the important words used in a written document
annotation—extra information which is not normally displayed, such as citation information from a data structure that provides citations for text cut from a formatted document
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1A illustrates a process by which remote documents are obtained and collected and then subsequently converted to other formats. Local computer 1 connects to a remote computer 3 via a network 2. Then it accesses file data from a network accessible file collection 4 and retrieves the desired files onto the local computer 1 over the network 2. Once on the local computer 1, the files can be converted into a single converted file 5. Once converted, the file can be output to a peripheral device 6, such as a display or a printer (as shown). Peripheral devices 6 are well known to include hard disk drives, floppy disk drives, tape drives, flash drives, CD drives, DVD drives. Peripheral devices 6 are well known to accept various types of computer readable media such as hard disk platters, floppy disks, tapes, memory chips, CDs, DVDs, and similar media. The computer readable medium may store the program instructions that make up a computer software program or routine, computer data, and/or computer data structures.
For example, the United States Patent and Trademark Office (USPTO) has a service (remote computer 3) which provides patent publications as TIFF files, one file for each page.
A patent related embodiment performs the following steps on local computer 1:

    
    
        a) Input a patent number
        b) Access the USPTO World Wide Web site (remote computer 3) over the
    
    


Internet (network 2) to obtain the HTML text version of a patent and to use that HTML to determine the number of pages represented by graphic images (e.g. TIFF)

    
    
        c) Download each page's graphic image from the USPTO World Wide Web site (remote computer 3) over the Internet (network 2)
        d) Convert the collection of graphic images into a single document (e.g. PDF or multipart TIFF).
        e) Optically recognize (via OCR) the page graphic images. Alternatively, each page's graphic image can be processed on the fly (e.g. recognized as each is downloaded in step c above).
    
    


These steps run on one computer or on a group of computers. These steps could be implemented in computer software. Example embodiments include an Acrobat plug-in or a World Wide Web browser plug-in. Good results have also been obtained implementing these steps as a script running on a group of computers including one computer running an OCR engine (such as OmniPage, TextBridge, or other commercially available OCR engine) and another computer running an Oracle database.
A novel improvement in the system illustrated in FIG. 1A is that an HTML (or plain text) version of the same subject matter can be used to correct spelling in an OCR document created from graphic page images (e.g. using Acrobat OCR capture). For example, in the embodiment for U.S. patents, the USPTO also provides an HTML version of the patent that can be used to correct and correlated the OCR text. It is well known that OCR is not 100% perfect and human comparison and correction is costly. This aspect of the system can significantly improve the value of searchable documents created by OCR.
Once the graphic images are converted (and optionally corrected), the document 5 can be printed, for example on printer 6.
FIG. 1B illustrates production of a searchable annotated formatted document 60. The U.S. patent example will be used to illustrate this aspect of the system. The USPTO provides a graphic image 10 for each page of a published patent. These graphic images 10 (e.g. TIFF files) are not text searchable (they are like photographs). A formatted document 30, such as an Adobe Acrobat PDF, can be created as a binder holding every graphic image 10 (routine A). See also FIG. 1A. The formatted document 30 (e.g. PDF file) can be processed with OCR (routine B) to convert the images to searchable text forming a searchable formatted document 40. Alternatively, an OCR engine can provide structured data which describes the text elements found in the document with the graphic location of each element, and which can be used instead of searchable formatted document 40. The USPTO also provides a separate and distinct text file 20 in HTML format for many patents. Unlike the graphic images 10 which are not text searchable, the text file 20 is electronically searchable. The searchable formatted document 40 is correlated with the text file 20 to correct the OCR text (routine C) resulting in a corrected formatted document 50.
The corrected formatted document 50 is a valuable tool for analysis.
Further, the corrected formatted document 50 can be used to add various annotations (routine D) to produce a searchable annotated formatted document 60. “Annotated” is not used in the general sense as would be understood by one of skill in the art. The word is used here in a new limited way to refer to the annotations from the data structure(s) 200 that provide the internal citations for quotes pasted from the searchable annotated formatted document 60. Again using the U.S. patent example, the searchable annotated formatted document 60 version of a patent can be used as the primary analysis document in a patent litigation or evaluation. When an expert or attorney wants to refer to a particular section of the patent, the user simply selects the desired words and a highly accurate quote and citation, including for example, column and line numbers, is automatically generated and can be pasted into a report or brief.
FIG. 2A illustrates computer data structures that are used to verify, correlate and correct document data, for example, patent OCR data. The computer data structures 200 can be implemented in various ways. Good results have been obtained by implementing them as Microsoft Excel spreadsheets, perl data structures, XML files, or Oracle database data tables.
The first data structure 200a generally contains each unit with information used to provide an internal citation, e.g. “('498 Patent 12:47-13:5)”. An example of a unit would be a sentence or a title. This data is substantially obtained from the HTML (or text version of the document) and may contain estimated values. In one embodiment, a spreadsheet document (such as Microsoft Excel) with functions is used to estimate the citations (to improve correlation ease or accuracy).
The second data structure 200b generally contains each line (or column line). Each column line has only one column and/or line number associated with it. This data preferably comes from OCR data (but may be input by people).
The data between these two structures are correlated with a unique ID for each entry in the tables. The sentence data has an ID for each sentence. The column line data has an ID for each line. The line data is matched, if possible, to each sentence's unique ID and give a sentence a relative ordinal number. The actual citation data, such as start column, start line, end column, and end line, is filled in the first data structure 200a based on matching first and last line data. The OCR text is corrected by verification against the HMTL data. Missing data in the data structure is flagged and estimates are used.
FIG. 2B illustrates an exemplary text data structure 200a that holds information that will be used to provide the citations for quotes pasted from the searchable annotated formatted document 60 or citations on a word or phrase corpus 702. The text data structure 200a also provides an alternative output that can be used independently from the formatted documents (30, 40, 50 or 60). The text data structure 200a is first instantiated by a parsing routine (FIG. 3) and updated by a correlation and correction routine (FIG. 4).
FIG. 2C illustrates an exemplary meta-data data structure 200b that holds information that will be used to as an interim repository for the data parsed from the searchable formatted document 40, or alternatively obtained from OCR.
FIG. 3A illustrates a text parse computer routine (which could be implemented in Perl, for example) which reads the text from the text file 20 or another source of text (step 302). It determines the document parts (step 304). For example, in a U.S. patent embodiment, parts could be one of Abstract, Drawing, Specification, or Claims. Then it determines document sections (step 306). For example, in a U.S. patent embodiment, document sections include Background of the Invention, Summary of the Invention section, and so forth. Then it determines new paragraphs (step 308). Then it determines paragraphs types (step 310). For example, regular paragraph text, tables, equations, etc. In step 312, the text data structure 200a in FIG. 2B would be filled in except for the citation fields (72). The text for each heading or sentence would be filled in the text field (80). Relative numbers would be filled in, for example in the specification part (92), each paragraph would be assigned a sequential paragraph number (81) and sequential sentence number (82). Sentence numbers would restart at 1 for each paragraph. In addition, any new paragraph starts (83) would be identified. In the patent drawings, for example, any text from the figures would be indexed. In the claims, each clause would be relative to the claim. The part fields (73, 90) and the section fields (74, 91) would be filled in.
At this point the text data structure 200a (without the citations) has an alternative use. It can be used to produce a text version of the subject document (e.g. patent) with numbered paragraphs (e.g. for electronic filing) e.g. “[103] Referring to FIG. 1B . . . .”
FIG. 3B illustrates the searchable formatted document parse computer routine (which could be implemented in Perl, for example) which reads the searchable formatted document 40 (step 326). Then it takes the words and assembles the lines (step 328). Then it allocates each line to either the left or right column (step 330). Then it calculates the line numbers for each line (step 332). At this point, the meta-data data structure 200b in FIG. 2C would be filled in completely.
FIG. 5 illustrates the annotation computer routine which is an implementation of routine D in FIG. 1B. First the text (20 or 50) is parsed by the parse routine 62 (e.g. using the text parse routine shown in FIG. 3A) and the searchable formatted document parse routine (e.g. see FIG. 3B). Next the text data structure 200a is updated with correlation and correction information by the correlate and correct routine 64. For example, see FIG. 4.
The correlation information in the patent example would be the citation column, line and word numbers for the start and end of each sentence. The end could be optional because, for example, it could be determined by looking at the next record's start. The next step is to attach the data (e.g. FIG. 2B) by the attach data routine 66 to the document. In some embodiments, the data would be meta-data that is not normally viewable in normal display modes. In other embodiments, the data in each record could be stored as a user displayable “annotation” (in the general sense) at the user's option. In other embodiments, the data is simply appended to the end of the document e.g. as a table.
Next the words and/or sentences are tagged by the tag words and sentences routine (68) in the formatted document so that when a portion is cut or copied, the citation associated with the text is cut or copied with it. Special software associated with the document viewer would handle the “cut” and/or “copy” operation. For example, in PDF or FrameMaker or Microsoft Word a plug-in could be added (either by the publisher or as a 3rd party plug-in) to provide text plus the citation (e.g. “U.S. Pat. No. 8,888,523 17:40-18:3”) in the paste buffer.
Note that step 68 in FIG. 5 could be optional because the plug-in could use the attached data (step 66) to provide the citation in the paste buffer. However, by tagging the documents, the determination of the citation for a particular set of words is more straightforward at the time of the cut and/or copy operation.
FIG. 4 illustrates an example of the correlate and correct step 64 of FIG. 5. A text file 20 is read (step 402). A searchable formatted document 40 is read (step 404). The order of steps 402 and 404 is not significant, and may be performed in parallel. In step 406, the text file 20 in the form of the text data structure 200a is compared with a searchable formatted document 40 in the form of the meta-data data structure 200b. The relative text is matched to the positional information in the graphic version of the same document to determine page or column number, line number, and word number (92) or the line (step 408). If the document contains figures (decision 410), then the figure numbers and item numbers (94) are determined in step 412. If the document contains claims (decision 414), then the claim numbers and clause numbers are also determined in step 416. Thus the correlation routine updates the text data structure 200a (FIG. 2B) with the start (and optionally end) citation information 72 (84-89).
If the document or page has a document ID (e.g. a BATES number), it is added in (76, 98). After the correlate and correct routine (e.g. for example, see FIG. 4) is complete the data structure can be used in many ways including but not limited to:

    1. Annotation of the corrected formatted document 50 to form the searchable annotated formatted document 60.
    2. Production of a spreadsheet containing each text element and citation where by a reader can find text in the spreadsheet by electronically searching and quickly find the internal citation or location of the text in a paper version.
    3. Input to a concordance program 600 that identifies each occurrence of a word or phrase and produces a concordance 602 with each sentence with the specified word or phrase and its citation (FIG. 6).
    4. Input to a corpus program 700 that identifies each occurrence of a word or phrase and produces a corpus 702 with each sentence and with the specified word or phrase and its citation (FIG. 7A). FIG. 7B shows an embodiment of word or phrase corpus 702.
    5. Input to a citation program 800 that produces a citation document 802 with each sentence and with its citation (FIG. 8A). FIG. 8B shows an embodiment of a citation document 802.


Note the word “corpus” generally means “entire body.” In the context of the field of language analysis it refers to a collection of recorded utterances used as a basis for the descriptive analysis of a language. In the context of this invention the word “corpus” (as well as “concordance”) is limited to the language used in a single document (e.g. a patent) or a small group of related documents (e.g. a set of related patents with common inventorship or subject matter).
The corpus 702 could be corpus for a single word or phrase i.e. a “word corpus” or for all the words in the document i.e. a “document corpus” or for a set of key words (e.g. a) similar to those selected for a concordance, or b) a set of disputed terms). This invention is not limited to patent analysis. It is also useful for analysis of other evidence, such as e-mail, source code, contracts, discovery documents, Web pages, contracts, etc.
The methods for:

    
    
        generating a corrected formatted document 50 (e.g. FIG. 1B),
        generating a searchable annotated formatted document 60 (e.g. FIG. 1B),
        generating a concordance 602 (e.g. FIG. 6),
        generating a corpus 702 (e.g. FIG. 7A), and
        generating a citation document 802 (e.g. FIG. 8A),

can each be implemented on a web site computer enabled by a database for storing the correlation data and various generated documents.

    
    


ADVANTAGES
Searchable
Text searches can be performed within the document or across multiple documents.
Copy and Paste Citation
Each sentence in the document can be copied and pasted into other documents. The internal citation for each sentence (or group of sentences) is copied and pasted along with the sentence.
Original Document Format Maintained
The original format of the document is maintained after it has been converted to a searchable format.
Identify Location in Original Document
As formats in the text file 20 may differ from the original formatted document 30, it is important that the annotations or citations correlate with each sentence and/or line and/or heading to identify its relative location with a document.
Accuracy
Optical Character Recognition (OCR) systems have struggled for decades to improve accuracy. OCR does very poorly on some documents. Further, for some situations, such as an expert witness report or Federal Court brief, errors can have severe impact on the perception of the facts in the case and ultimately cost millions of dollars. The present invention provides a way to improve accuracy of the computer generated data as well as improve the accuracy of human construction of reports and briefs.
Thorough
The concordance and corpus features of present invention provide a means for through analysis of every instance of a word or phase, or related phrases, in a document of related set of documents. For example, in a patent case, the corpus documents on disputed claim terms will not only make claim term analysis more efficient, but will also ensure that all usage is considered and inconsistencies are understood. The use of corpus reports will improve the rigorousness of claim term analysis and provide judges with stronger input upon which to base their judgments.
Cost Saving
The present invention provides several aspects that will save time and improve the performance of highly paid experts, analysis, and attorneys. Thus, significant savings will result from use of the present invention.
Conclusion, Ramification, and Scope
Accordingly, an aspect of the present invention provides searchable annotated formatted documents that are produced by correlating documents stored as a photographic or scanned graphic representations of an actual document (evidence, report, court order, etc.) with textual version of the same documents. A produced document will provide additional details in a data structure that supports citation annotation as well as other types of analysis of a document. The data structure also supports generation of citation reports and corpus reports. A method aspect includes creating searchable annotated formatted documents including citation and corpus reports by correlating and correcting text files with photographic or scanned graphic of the original documents. Data structures for correlating and correcting text files with graphic images are valuable output by themselves. Another method aspect includes generation of citation reports, concordance reports, and corpus reports. Data structures provide for citation reports, concordance reports, and corpus reports generation.
While the above descriptions contain several specifics these should not be construed as limitations on the scope of the invention, but rather as examples of some of the preferred embodiments thereof. Many other variations are possible. For example, although U.S. patent data has been used in the examples, the document system could be applied to other categories of documents. Some embodiments would target specific types of documents. The routines could be implemented in hardware or using various software platforms. Additionally, the system could have additional features, or be used in different countries without departing from the scope and spirit of the novel features of the present invention.
Accordingly, the scope of the invention should be determined not by the illustrated embodiments, but by the appended claims and their legal equivalents.

## Claims

1. A non-transitory computer readable medium encoded with program instructions which are executed by a computer to provide a method of generating internal citations for a formatted document, the instructions comprising the steps of:
a) obtaining graphic representations of each page of the formatted document,
wherein the formatted document is a patent document,
b) optically recognizing characters on each page of the formatted document, and determining the position of the characters on each page,
c) obtaining a separate and distinct text version of the formatted document from a source separate and distinct from the formatted document,
d) parsing text from the text version, the parsed text being separate and distinct from the recognized characters,
e) correlating the recognized characters with the parsed text to determine an internal citation for each sentence, wherein the internal citation identifies the document and a citation location inside the document where the corresponding sentence is found, and
f) creating a data structure storing data determined in the correlating step,
wherein the citation location comprises:
i) an internal citation column number; and
ii) an internal citation line number.

2. The computer readable medium of claim 1 further comprising a step of:
using the parsed text to correct the recognized characters, yielding a corrected formatted document.

3. The computer readable medium of claim 1 further comprising a step of:
attaching the data structure to the formatted document,
wherein, when a portion of text is copied from the formatted document, a corresponding internal citation is included with the copied portion.

4. The computer readable medium of claim 3 wherein the attaching step yields a searchable annotated formatted document.

5. The computer readable medium of claim 1 wherein the data structure comprises citation start data, comprising a start column number and a start line number.

6. The computer readable medium of claim 5 wherein the data structure comprises citation end data, comprising an end column number and an end line number.

7. The computer readable medium of claim 1 wherein the parsing the text step further includes at least one of the group of:
a) determining new paragraphs, and
b) determining paragraph types.

8. The computer readable medium of claim 1 wherein the parsing the text step further includes determining document parts, said document parts each comprising a distinct group of pages, wherein the document parts includes at least one of the group of:
a) abstract,
b) drawing,
c) specification, and
d) claims.

9. The computer readable medium of claim 1 wherein the parsing the text step further includes determining document sections, said document sections each comprising a distinct group of paragraphs, under one or more headings, wherein the document sections includes at least one of the group of:
a) field of invention,
b) background of invention,
c) summary of invention,
d) description of drawings, and
e) description of invention.

10. The computer readable medium of claim 1 wherein the determining the position of the characters substep further includes at least one of the group of:
a) assembling lines,
b) allocating lines to columns, and
c) calculating line numbers.

11. The computer readable medium of claim 1 wherein the correlating step further includes at least one of the group of:
a) determining column numbers, and
b) determining line numbers.

12. The computer readable medium of claim 1 wherein the formatted document contains patent drawing figures, and
wherein the correlating step further includes at least one of the group of:
a) determining figure numbers in the drawing figures, and
b) determining figure item numbers in drawings figures.

13. The computer readable medium of claim 1 wherein the correlating step further includes at least one of the group of:
a) determining patent claim numbers, and
b) determining patent clause numbers.

14. The computer readable medium of claim 1 further comprising a step of:
generating a citation document using the correlation data structure.

15. The computer readable medium of claim 1 further comprising a step of:
generating a concordance report using the correlation data structure, the concordance report comprising rows comprising:
a) a word or phrase, and
b) one or more internal citations, indicating where the word or phrase occurs in the formatted document.

16. A non-transitory computer readable medium encoded with program instructions which are executed by a computer to provide a method of generating internal citations for a formatted document, the instructions comprising the steps of:
a) obtaining graphic representations of each page of the formatted document,
wherein the formatted document is a patent document,
b) optically recognizing characters on each page of the formatted document, and determining the position of the characters on each page,
c) obtaining a separate and distinct text version of the formatted document,
d) parsing text from the text version, the parsed text being separate and distinct from the recognized characters,
e) correlating the recognized characters with the parsed text to determine an internal citation for each sentence, wherein the internal citation identifies the document and a citation location inside the document where the corresponding sentence is found,
f) creating a data structure storing data determined in the correlating step,
wherein the data structure comprises:
g) internal citation page number data or internal citation paragraph number data and
h) internal citation sentence number data.

17. A non-transitory computer readable medium encoded with program instructions which are executed by a computer to provide a method of generating internal citations for a formatted document, the instructions comprising the steps of:
a) obtaining graphic representations of each page of the formatted document,
wherein the formatted document is a patent document,
b) optically recognizing characters on each page of the formatted document, and determining the position of the characters on each page,
c) obtaining a separate and distinct text version of the formatted document,
d) parsing text from the text version, the parsed text being separate and distinct from the recognized characters,
e) correlating the recognized characters with the parsed text to determine an internal citation for each sentence, wherein the internal citation identifies the document and a citation location inside the document where the corresponding sentence is found,
f) creating a data structure storing data determined in the correlating step, and
g) generating a patent corpus report using the correlation data structure, the patent corpus report comprising rows comprising:
i) prior context,
ii) a word or phrase,
iii) subsequent context, and
iv) an internal citation.

18. The computer readable medium of claim 17 wherein the patent corpus report is based on a single word root.

19. The computer readable medium of claim 17 wherein the patent corpus report is based on one of the group of:
a) a phrase, and
b) a set of related words.

20. The computer readable medium of claim 17, wherein at least one citation location comprises:
i) an internal citation column number; and
ii) an internal citation line number.