Patent US5338066A successfully refreshed from Google Patents.
US5338066A
Expired / Lapsed
US
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Method and security substrate for protecting against duplication with a color copier
Assignee: Nocopi Technologies Inc
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Filing: 1992-04-01
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Granted: 1994-08-16
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Expires: 2012-04-01
Abstract
Abstract A method for protecting against duplication of a document with a color copier and a security substrate comprises providing a background color on a document having an average reflectance value and printing on the background with a contrast color having a spectral characteristic which modulates the average reflectance value by no more than 5% and has an average value equal to the average reflectance value. The contrast color is printed with a printing medium including one of a colorformer leucodye and an activating phenolic resin. The other of the colorformer leucodye and the activating phenolic resin is to the printing medium on the document later to verify that the document is an original.
Inventors
- 👤 Arshavir Gundjian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:54
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/04; G03G21/043; Y; Y10; Y10S; Y10S283/00; Y10S283/902; Y10S428/00; Y10S428/914; Y10S428/915; Y10S428/916; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901; Y10T428/26; Y10T428/261; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31964; Y10T428/31967
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
A security substrate for protecting against duplication with a color copier; comprising: a main surface; a background color on the main surface having an average reflectance value; and a contrast color on the background color having a spectral characteristic which modulates the average reflectance value by no moret han 5% and has an average reflectance equal to the average reflectance value, wherein the contrast color is composed of a printing medium including one from the group consisting of a color former leuco dye and an activating phenolic resin.
Claim 2
Dependent Claim
88 words
A security substrate for protecting against duplication with a color copier; comprising: a main surface; a background color on the main surface having an average reflectance value; and a contrast color on the background color having a spectral characteristic which modulates the average reflectance value by no moret han 5% and has an average reflectance equal to the average reflectance value, wherein the contrast color is composed of a printing medium including one from the group consisting of a color former leuco dye and an activating phenolic resin.
Claim 3
Independent Claim
93 words
A method for protecting against duplication with a color copier; comprising the steps of: providing a background color on a substrate having an average reflectance value; and printing on the background color with a contrast color having a spectral characteristic which modulates the average reflectance value by no more than 5% and has an average value equal to the average reflectance value, wherein the step of printing the contrast color comprises printing with a printing medium including one from the group consisting of a color former leuco dye and an activating phenolic resin.
Claim 4
Independent Claim
93 words
A method for protecting against duplication with a color copier; comprising the steps of: providing a background color on a substrate having an average reflectance value; and printing on the background color with a contrast color having a spectral characteristic which modulates the average reflectance value by no more than 5% and has an average value equal to the average reflectance value, wherein the step of printing the contrast color comprises printing with a printing medium including one from the group consisting of a color former leuco dye and an activating phenolic resin.
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JPS576113A
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FR2565268A1
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US4846502A
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US4867481A
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EP0353974A2
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DE3905155A1
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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) | 1997-08-15 | 1998-02-14 | 1998-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-15 | 2002-02-14 | 2002-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-15 | 2006-02-14 | 2006-08-16 | $7700.00 | Window Closed / Lapsed |