US5324567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink composition and components thereof
Assignee: De la Rue International Ltd
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Filing: 1990-12-28
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Granted: 1994-06-28
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Expires: 2010-12-28
Abstract
Abstract Raman-active compounds such as polydiacetylenes are provided in the form of particles whose maximum dimension is 40 μm. They can be formulated into inks, for the purpose of printing on security documents which are thus readily capable of authentication.
Inventors
- 👤 Robin Bratchley
- 👤 Nicholas O. Nugent
- 👤 Linda S. Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:44
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/50; B; B41; B41M; B41M3/00; B41M3/14; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/25; Y10T428/254; Y10T428/29; Y10T428/2982; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
67 words
A Raman-active compound in the form of particles whose maximum dimension is 40 μm, the compound having the characteristic that, when applied to a substrate and exposed to laser light at an incident intensity of 1.5-3.2 mW, Raman scattering can be detected at a wavelength in the vicinity of maximum absorbance and at a level of at least 0.001 pW above the intensity of the background signal.
Claim 2
Dependent Claim
67 words
A Raman-active compound in the form of particles whose maximum dimension is 40 μm, the compound having the characteristic that, when applied to a substrate and exposed to laser light at an incident intensity of 1.5-3.2 mW, Raman scattering can be detected at a wavelength in the vicinity of maximum absorbance and at a level of at least 0.001 pW above the intensity of the background signal.
Claim 3
Dependent Claim
20 words
A compound according to claim I, wherein the Raman resonance scattering is at least 0.05 pW above the background signal.
Claim 4
Dependent Claim
20 words
A compound according to claim 1, wherein the Raman resonance scattering is at least 0.5 pW above the background signal.
Claim 5
Dependent Claim
20 words
A compound according to claim 1, wherein the Raman resonance scattering is at least 2 pW above the background signal.
Claim 6
Dependent Claim
68 words
A Raman-active compound in the form of particles whose maximum dimension is 40 μm, the compound having the characteristic that, when applied to a substrate and exposed to laser light at an incident intensity of 1.5-3.2 mW, resonance Raman scattering can be detected at a wavelength in the vicinity of maximum absorbance and at a factor of at least 0.1% of that for a comparative substrate bearing poly-1,6-di(N-carbazolyl)-2,4-hexadiyne.
Claim 7
Dependent Claim
68 words
A Raman-active compound in the form of particles whose maximum dimension is 40 μm, the compound having the characteristic that, when applied to a substrate and exposed to laser light at an incident intensity of 1.5-3.2 mW, resonance Raman scattering can be detected at a wavelength in the vicinity of maximum absorbance and at a factor of at least 0.1% of that for a comparative substrate bearing poly-1,6-di(N-carbazolyl)-2,4-hexadiyne.
Claim 8
Dependent Claim
13 words
A compound according to claim 5, wherein the factor is at least 1%.
Claim 9
Dependent Claim
13 words
A compound according to claim 5, wherein the factor is at least 10%.
Claim 10
Dependent Claim
13 words
A compound according to claim 5, wherein the factor is at least 30%.
Claim 11
Dependent Claim
13 words
A polydiacetylene in the form of particles whose maximum dimension is 40 μm.
Claim 12
Dependent Claim
13 words
A polydiacetylene in the form of particles whose maximum dimension is 40 μm.
Claim 13
Dependent Claim
14 words
A conjugated diacetylene in the form of particles whose maximum dimension is 40 μm.
Claim 14
Dependent Claim
14 words
A conjugated diacetylene in the form of particles whose maximum dimension is 40 μm.
Claim 15
Dependent Claim
13 words
A compound according to claim 1, wherein the maximum dimension is 10 μm.
Claim 16
Dependent Claim
13 words
A compound according to claim 11, wherein the maximum dimension is 5 μm.
Claim 17
Dependent Claim
13 words
A compound according to claim 11, wherein the maximum dimension is 1 μm.
Claim 18
Dependent Claim
10 words
An ink composition comprising a compound according to claim 1.
Claim 19
Dependent Claim
17 words
An ink composition according to claim 14, which comprises 1 to 10% by weight of the compound.
Claim 20
Dependent Claim
16 words
An ink composition according to claim 14, which further comprises a drier and an ink vehicle.
Claim 21
Dependent Claim
11 words
A security document including a Raman-active compound, according to claim 1.
Claim 22
Dependent Claim
18 words
A security document including a polydiacetylene in the form of particles having a maximum dimension of 40 μm.
Claim 23
Dependent Claim
18 words
A security document including a polydiacetylene in the form of particles having a maximum dimension of 40 μm.
Claim 24
Dependent Claim
12 words
A security document printed with an ink composition according to claim 14.
Claim 25
Dependent Claim
23 words
A method of authenticating a security document according to claim 17, which comprises irradiating the document and detecting the presence of the compound.
Claim 26
Dependent Claim
106 words
A Raman-active compound comprising a polydiacetylene applied to a substrate in the form of particles having a maximum dimension of 40 μm, the compound having the characteristic that, when applied to said substrate and exposed to laser light at an incident intensity of 1.5-3.2 mW, Raman scattering can be detected at a wavelength in the vicinity of maximum absorbance and at a level of at least 0.001 pW above the intensity of background signal or resonance Raman scattering can be detected at a wavelength in the vicinity of maximum absorbance and at a factor of at least 0.1% of that for a comparative substrate bearing poly-1,6-di(N-carbazolyl)-2,4-hexadiyne.
Claim 27
Dependent Claim
106 words
A Raman-active compound comprising a polydiacetylene applied to a substrate in the form of particles having a maximum dimension of 40 μm, the compound having the characteristic that, when applied to said substrate and exposed to laser light at an incident intensity of 1.5-3.2 mW, Raman scattering can be detected at a wavelength in the vicinity of maximum absorbance and at a level of at least 0.001 pW above the intensity of background signal or resonance Raman scattering can be detected at a wavelength in the vicinity of maximum absorbance and at a factor of at least 0.1% of that for a comparative substrate bearing poly-1,6-di(N-carbazolyl)-2,4-hexadiyne.
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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) | 1997-06-27 | 1997-12-27 | 1998-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-27 | 2001-12-27 | 2002-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-27 | 2005-12-27 | 2006-06-28 | $7700.00 | Window Closed / Lapsed |