US4921280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security fibers and other materials made luminescent by a dyeing process, processes for their manufacture and their applications
Assignee: Individual
•
Filing: 1989-06-13
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Granted: 1990-05-01
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Expires: 2009-06-13
Abstract
Abstract The invention relates to security fibers and other allied materials made luminescent by a dyeing process employing rare-earth compounds and their applications in fiduciary documents and other materials requiring authentication.
Inventors
- 👤 Michel Jalon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:03
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/50; B; B42; B42D; B42D25/00; B42D25/20; B42D25/29; D06P; D06P1/00; D06P1/0004; D06P1/0012; D21; D21H; D21H21/00; D21H21/14; D21H21/40; D21H21/44; D21H21/46; Y; Y10; Y10S; Y10S283/00; Y10S283/903
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
Fluorescent fibers and threads comprising: (a) fibers or threads made from polyester, polyamide, or combinations thereof; and (b) at least one luminescent rare-earth chelate, the fibers or threads being dyed with the luminescent rare-earth chelate, the dyed fibers or threads exhibiting at least one luminescence emission in a region of the infrared, visible, ultraviolet, or x-ray spectrum under excitation by infrared, ultraviolet or x-rays, the luminescence emission region of the dyed fibers or threads being different than the luminescence emission region of the luminescent rare-earth chelate alone prior to the chelate being used to dye the fibers or threads.
Claim 2
Dependent Claim
99 words
Fluorescent fibers and threads comprising: (a) fibers or threads made from polyester, polyamide, or combinations thereof; and (b) at least one luminescent rare-earth chelate, the fibers or threads being dyed with the luminescent rare-earth chelate, the dyed fibers or threads exhibiting at least one luminescence emission in a region of the infrared, visible, ultraviolet, or x-ray spectrum under excitation by infrared, ultraviolet or x-rays, the luminescence emission region of the dyed fibers or threads being different than the luminescence emission region of the luminescent rare-earth chelate alone prior to the chelate being used to dye the fibers or threads.
Claim 3
Dependent Claim
20 words
Fiduciary documents and security papers requiring a means of authentication which comprise the fluorescent fibers and threads of claim 1.
Claim 4
Dependent Claim
30 words
The fluorescent fibers and threads of claim 1, wherein the luminescent rare-earth chelate is a chelate of yttrium, thorium, or a lanthanide having an atomic number from 57 to 71.
Claim 5
Dependent Claim
15 words
The fluorescent fibers and threads of claim 3, wherein the rare-earth chelate is terbium chelate.
Claim 6
Dependent Claim
15 words
The fluorescent fibers and threads of claim 3, wherein the fibers or threads are colored.
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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) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |