US5193854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tamper-resistant article and method of authenticating the same
Assignee: Oberthur Gaming Technologies Corp
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Filing: 1992-02-28
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Granted: 1993-03-16
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Expires: 2012-02-28
Abstract
Abstract A printed document, such as a lottery ticket, includes a thermochromic layer at least over the imprinted data region. The printed document can be authenticated by applying heat to the thermochromic material and observing the presence or absence of a reversible color change.
Inventors
- 👤 Joseph C. Borowski, Jr.
- 👤 Robert O. Fulton
- 👤 Jacques Lavoie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:11
CPC Classifications
G; G07; G07D; G07D7/00; G07D7/14; A; A63; A63F; A63F3/00; A63F3/06; A63F3/065; A63F3/0685; Y; Y10; Y10S; Y10S283/00; Y10S283/902; Y10S283/903
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
103 words
A printed document which is in the form of a lottery ticket comprising: (a) a substrate; (b) game data imaged on a portion of the substrate which when exposed determines if a prize has been won; (c) a layer of a thermochromic material, capable of undergoing a reversible color change upon exposure to heat, placed over at least the game data portion of the substrate with said game data being visible therethrough; and (d) a scratch-off layer placed upon the portion of the thermochromic layer which covers the game data and adapted to be removed by the user to reveal the game data.
Claim 2
Dependent Claim
103 words
A printed document which is in the form of a lottery ticket comprising: (a) a substrate; (b) game data imaged on a portion of the substrate which when exposed determines if a prize has been won; (c) a layer of a thermochromic material, capable of undergoing a reversible color change upon exposure to heat, placed over at least the game data portion of the substrate with said game data being visible therethrough; and (d) a scratch-off layer placed upon the portion of the thermochromic layer which covers the game data and adapted to be removed by the user to reveal the game data.
Claim 3
Dependent Claim
28 words
The printed document of claim 1 wherein the thermochromic material comprises a mixture of a water base material and a slurry containing a microencapsulated oil and leuco dye.
Claim 4
Dependent Claim
21 words
The printed document of claim 1 wherein the layer of thermochromic material covers only the game data portion of the substrate.
Claim 5
Dependent Claim
24 words
The printed document of claim 1 wherein the substrate is made from a material selected from the group consisting of virgin and recyclable paper.
Claim 6
Dependent Claim
17 words
The printed document of claim 1 wherein the lottery ticket is printed on a foil laminated substrate.
Claim 7
Dependent Claim
24 words
The printed document of claim 3 wherein the substrate is made from a material selected from the group consisting of virgin and recyclable paper.
Claim 8
Independent Claim
137 words
A method of authenticating a printed document, said printed document comprising: (a) a substrate; (b) game data imaged on a portion of the substrate which when exposed determines if a prize has been won; (c) a layer of thermochromic material, capable of undergoing a reversible color change upon exposure to heat, placed over at least the game data portion of the substrate with said game data being visible therethrough; and (d) a scratch-off layer placed upon the portion of the thermochromic layer which covers the game data and adapted to be removed by the user to reveal the game data, said process comprising removing the scratch-off layer and heating the thermochromic layer to a temperature sufficient to cause a reversible color change, whereby if a reversible color change does not occur, the printed document is not authentic.
Claim 9
Independent Claim
137 words
A method of authenticating a printed document, said printed document comprising: (a) a substrate; (b) game data imaged on a portion of the substrate which when exposed determines if a prize has been won; (c) a layer of thermochromic material, capable of undergoing a reversible color change upon exposure to heat, placed over at least the game data portion of the substrate with said game data being visible therethrough; and (d) a scratch-off layer placed upon the portion of the thermochromic layer which covers the game data and adapted to be removed by the user to reveal the game data, said process comprising removing the scratch-off layer and heating the thermochromic layer to a temperature sufficient to cause a reversible color change, whereby if a reversible color change does not occur, the printed document is not authentic.
Claim 10
Dependent Claim
23 words
The method of claim 7 wherein the substrate is made from a material selected from the group consisting of virgin and recyclable paper.
Claim 11
Dependent Claim
20 words
The method of claim 7 wherein the layer of thermochromic material covers only the game data portion of the substrate.
Claim 12
Dependent Claim
23 words
The method of claim 9 wherein the substrate is made from a material selected from the group consisting of virgin and recyclable paper.
Claim 13
Dependent Claim
27 words
The method of claim 7 wherein the step of heating the thermochromic layer is performed by contacting the thermochromic layer with a part of the human body.
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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) | 1996-03-15 | 1996-09-14 | 1997-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-15 | 2000-09-14 | 2001-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-15 | 2004-09-14 | 2005-03-16 | $7700.00 | Window Closed / Lapsed |