US4863783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security paper
Assignee: Arjo Wiggins Fine Papers Ltd
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Filing: 1986-12-05
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Granted: 1989-09-05
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Expires: 2006-12-05
Abstract
Abstract Paper embodying for purposes of identification one or more pigments, inconspicuous in daylight but visible on inspection in darkened surroundings or after illumination at predetermined wavelength from an artificial source, wherein the pigment is in the form of granules which are of 30 to 500 microns particle size and, to secure contrast between the pigment and background in said inspection, are essentially free of finer particles.
Inventors
- 👤 Neil A. Milton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:11
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/44; D21H21/48; B; B41; B41M; B41M5/00; B41M5/124; Y; Y10; Y10S; Y10S283/00; Y10S283/904; Y10S428/00; Y10S428/916; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901; Y10T428/24934; Y10T428/31504; Y10T428/31971; Y10T428/31993; Y10T428/31996
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
Paper embodying for purposes of identification granules comprising 3 to 5 micron pigment particles chemically bound together by a cross-link binder, inconspicuous in daylight but visible on inspection in darkened surroundings or after illumination at predetermined wavelength from an artificial source, wherein the granules are of 30 to 500 microns particle size and, to secure contrast between the pigment and background in said inspection, said granules are essentially free of finer particles.
Claim 2
Dependent Claim
72 words
Paper embodying for purposes of identification granules comprising 3 to 5 micron pigment particles chemically bound together by a cross-link binder, inconspicuous in daylight but visible on inspection in darkened surroundings or after illumination at predetermined wavelength from an artificial source, wherein the granules are of 30 to 500 microns particle size and, to secure contrast between the pigment and background in said inspection, said granules are essentially free of finer particles.
Claim 3
Dependent Claim
17 words
Paper according to claim 1, wherein said particle size of said granules is 100 to 250 microns.
Claim 4
Dependent Claim
51 words
Paper according to claim 1, wherein the granules have been formed by adding a quantity of a liquid resin binder to the particles and tumbling until aggregates constituting the granules have been formed, said quantity of binder being sufficient to aggregate the particles but not to form a continuous liquid phase.
Claim 5
Dependent Claim
18 words
Paper according to claim 3, wherein the preformed particles are themselves aggregates formed by a like tumbling process.
Claim 6
Dependent Claim
22 words
Paper according to claim 1, wherein the granules are dispersed in the substance of the paper following incorporation in a paper-making stock.
Claim 7
Dependent Claim
17 words
Paper according to claim 1, wherein the granules are present as a coating applied to the paper.
Claim 8
Dependent Claim
16 words
Paper according to claim 1, wherein the granules are formed of performed light-reacting particles resin bonded.
Claim 9
Dependent Claim
17 words
Paper according to claim 1, wherein the granules are present as separated indicia applied to the paper.
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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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |