US5946103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halftone patterns for trusted printing
Assignee: Xerox Corp
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Filing: 1998-01-29
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Granted: 1999-08-31
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Expires: 2018-01-29
Abstract
Abstract Predetermined machine and/or human readable information is embedded in at least one serpentine pattern that is printed on each original document, so that any given instance of such a document can be later verified or refuted as being the original by determining whether this information can be recovered from the document or not.
Inventors
- 👤 Douglas N. Curry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:37
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/405; G; G06; G06T; G06T1/00; G06T1/0021; G06T1/0028; H04N1/32; H04N1/32101; H04N1/32144; H04N1/32149; H04N1/32203; H04N1/32219; H04N1/32256; G06T2201/00; G06T2201/005; G06T2201/0051; H04N2201/00; H04N2201/32; H04N2201/3201; H04N2201/3225; H04N2201/3233
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A method for verifying the originality of printed documents, said method comprising the steps of providing at least one trusted printer for printing original documents; embedding predetermined information in each of said original documents in at least one halftone pattern that is composed of halftone cells, each of said cells containing a fill pattern which is symmetric about a central axis of the cell, with said information being represented by the angular orientations of the respective axis of symmetry of at least some of said cells; classifying said documents as original documents only if said predetermined information can be recovered therefrom.
Claim 2
Independent Claim
101 words
A method for verifying the originality of printed documents, said method comprising the steps of providing at least one trusted printer for printing original documents; embedding predetermined information in each of said original documents in at least one halftone pattern that is composed of halftone cells, each of said cells containing a fill pattern which is symmetric about a central axis of the cell, with said information being represented by the angular orientations of the respective axis of symmetry of at least some of said cells; classifying said documents as original documents only if said predetermined information can be recovered therefrom.
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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) | 2002-08-30 | 2003-03-01 | 2003-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-08-30 | 2007-03-01 | 2007-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-08-30 | 2011-03-01 | 2011-08-31 | $7700.00 | Window Closed / Lapsed |