US5693693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bar code printing and scanning using wax based invisible fluorescent inks
Assignee: Syngenta Ltd
•
Filing: 1994-12-01
•
Granted: 1997-12-02
•
Expires: 2014-12-01
Abstract
Abstract Wax based invisible inks have been discovered that emit light at various wavelengths in the visible region when they are excited by UV light. This allows lower layer clear text information to be written on an object with a regular, visible ink and an upper layer bar code to be written over the lower layer text information with an ink that is invisible to the naked eye. This allows the lower layer text information and upper layer bar code to contain more information than conventional bar codes. These inks allow printing and decoding invisible bar codes over printed information with visible inks. The detection by fluorescence of these invisible inks provides a high signal to noise ratio and no interference with the visible printed information.
Inventors
- 👤 Judith D. Auslander
- 👤 William Berson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:21
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/06; G06K19/06009; G06K19/06037; C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/35; C08K5/357; C09; C09D; C09D11/00; C09D11/50; G06K1/00; G06K1/12; G06K1/121; G06K7/00; G06K7/10; G06K7/12; Y; Y10; Y10S; Y10S260/00; Y10S260/38
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
43 words
An ink composition comprising: a) 0.5 to 10% of 2-aryl-4H3, 1 or 2-(2-arylsulfonylaminophenyl-4H-3, 1-G benzoxazinone, 4); b) 65 to 85% of urethane compound of a synthetic petroleum wax; c) 4 to 15% carnauba wax; and d) 10 to 20% ethyl vinyl acetate polymer.
Claim 2
Dependent Claim
43 words
An ink composition comprising: a) 0.5 to 10% of 2-aryl-4H3, 1 or 2-(2-arylsulfonylaminophenyl-4H-3, 1-G benzoxazinone, 4); b) 65 to 85% of urethane compound of a synthetic petroleum wax; c) 4 to 15% carnauba wax; and d) 10 to 20% ethyl vinyl acetate polymer.
Claim 3
Dependent Claim
97 words
An ink composition comprising: a) 0.5 to 10% complexes of rare earth metal ions M 3+ , of the general formula: BM(L.sub.2) where; B is a cation such as Na + , Li + , NH 4 + ; M is a metal ion from the lanthanide group; and L is a chromphore ligand dispersed in; b) the complexes are dissolved in 65 to 85% of a wax selected from polyethylene wax, natural parafin wax and urethane derivative of oxidized synthetic wax; c) 4 to 15% carnauba wax; and d) 10 to 20% ethyl vinyl acetate polymer.
Claim 4
Dependent Claim
97 words
An ink composition comprising: a) 0.5 to 10% complexes of rare earth metal ions M 3+ , of the general formula: BM(L.sub.2) where; B is a cation such as Na + , Li + , NH 4 + ; M is a metal ion from the lanthanide group; and L is a chromphore ligand dispersed in; b) the complexes are dissolved in 65 to 85% of a wax selected from polyethylene wax, natural parafin wax and urethane derivative of oxidized synthetic wax; c) 4 to 15% carnauba wax; and d) 10 to 20% ethyl vinyl acetate polymer.
Claim 5
Dependent Claim
43 words
The complex claimed in claim 2, wherein the lanthanide is selected from the group of Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Tb 3+ , Dy 3+ , Yb 3+ , Er 3+ , and Tm 3+ .
Claim 6
Dependent Claim
56 words
The composition claimed in claim 2, wherein the chromophore ligand is selected from the group of β diketones of the general formula: ##STR4## where R 1 and R 2 belong to the groups of the alkyl radical C 1 -C 18 radical of halogenated C 1 -C 18 , (fluorinated or chlorinated) radical, phenyl, and thienyl.
Claim 7
Dependent Claim
46 words
The ink claimed in claim 2, wherein the chromphore ligand can be represented by the formula: ##STR5## where: R 3 is an alkyl group C 1 -C 18 or an halogenated alkyl with the same length. R4, R5, R6 and R7 are identical groups or different.
References Cited (Backward Citations)
FR1471367A
Cited
US4572803A
Cited
GB2090194A
Cited
US4918047A
Cited
JPS63191870A
Cited
EP0340898A2
Cited
US5431697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-01 | 2001-06-02 | 2001-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-01 | 2005-06-02 | 2005-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-01 | 2009-06-02 | 2009-12-02 | $7700.00 | Window Closed / Lapsed |