Patent US5135569A successfully refreshed from Google Patents.
US5135569A
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Ink composition containing fluorescent component and method of tagging articles therewith
Assignee: WR Grace and Co Conn
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Filing: 1990-08-24
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Granted: 1992-08-04
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Expires: 2010-08-24
Abstract
Abstract Provided is an ink composition which comprises a fluorescent dye. The ink composition is useful in tagging for subsequent identification various articles having a polymeric or porous organic or inorganic surface. The ink composition comprises a non-fluorescent ink such as a black ink, a fluorescent dye, and a solvent for the fluorescent dye, which solvent swells and impregnates the surface of the article thereby permitting impregnation of the article by the fluorescent dye. The resulting tagged article has a printed surface with a fluorescent dye impregnated within the article directly beneath the printing on the surface. Identification of the article can then take place by removing printed material, and subjecting the article to UV irradiation. Observing a bright fluorescent color characteristic of the fluorescent dye used confirms the authenticity of the article.
Inventors
- 👤 Eckart Mathias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:24
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/50
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
60 words
An ink composition which comprises (i) a fluorescent dye; (ii) a non-fluorescing ink which masks the presence of the fluorescent dye so that fluorescence is not observed; (iii) a solvent for the fluorescent dye which permits the fluorescent dye to impregnate the surface of a substrate, while allowing the non-fluorescing ink to remain substantially on the surface of the substrate.
Claim 2
Dependent Claim
60 words
An ink composition which comprises (i) a fluorescent dye; (ii) a non-fluorescing ink which masks the presence of the fluorescent dye so that fluorescence is not observed; (iii) a solvent for the fluorescent dye which permits the fluorescent dye to impregnate the surface of a substrate, while allowing the non-fluorescing ink to remain substantially on the surface of the substrate.
Claim 3
Dependent Claim
14 words
The ink composition of claim 1, wherein said non-fluorescing ink is a black ink.
Claim 4
Dependent Claim
14 words
The ink composition of claim 2, wherein the solvent comprises a mixture of ketones.
Claim 5
Dependent Claim
11 words
The ink composition of claim 2, wherein the solvent comprises diethylketone.
Claim 6
Dependent Claim
18 words
The ink composition of claim 1, wherein the fluorescent dye fluoresces with a blue/white, orange or green color.
Claim 7
Dependent Claim
21 words
The ink composition of claim 1, wherein the solvent comprises a ketone, chlorinated hydrocarbon, aromatic hydrocarbon, an ester or an ether.
Claim 8
Dependent Claim
12 words
The ink composition of claim 1, wherein the solvent comprises a ketone.
Claim 9
Dependent Claim
11 words
The ink composition of claim 1, wherein the solvent comprises diethylketone.
Claim 10
Dependent Claim
18 words
The ink composition of claim 1, wherein the solvent for the fluorescent dye comprises a mixture of solvents.
Claim 11
Dependent Claim
25 words
The ink composition of claim 1 wherein the fluorescent dye is a sulfuric acid disodium salt mixture with 7-(diethylamino)-4-methyl-2H-1-benzopyran-2-one; 3',6'-bis(diethylamino)spiro(isobenzofuran-1(3H)-9'-(9H)xanthen)-3-one; 4-amino-N-2,4-xylyl-naphthalimide; 7-(diethylamino)-4-methyl-coumarin; 14H-anthra[2,1,9-mna]thioxanthen-14-one; or, N-butyl-4-(butylamino)-naphthalimide.
Claim 12
Dependent Claim
21 words
The ink composition of claim 1, wherein the amount of fluorescent dye ranges from about 0.01% to about 15% by weight.
Claim 13
Dependent Claim
21 words
The ink composition of claim 1, wherein the amount of fluorescent dye ranges from about 1.0% to about 7% by weight.
Claim 14
Dependent Claim
24 words
The ink composition of claim 1, wherein the amount of solvent for fluorescent dye present ranges from about 5 to about 15% by weight.
Claim 15
Dependent Claim
35 words
The ink composition of claim 1 wherein the amount of fluorescent dye is about 0.01% to 15% by weight and the amount of solvent for the fluorescent dye is about 5 to 15% by weight.
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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) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-04 | 2004-02-03 | 2004-08-04 | $7700.00 | Window Closed / Lapsed |