US3801782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of selectively generating fluorescence and its subsequent detection
Assignee: Wyeth Holdings LLC
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Filing: 1972-01-27
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Granted: 1974-04-02
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Expires: 1992-01-27
Abstract
Abstract A system for storage and retrieval of information comprising the use of a non-fluorescent material capable of photoconversion to a fluorescent material under light of a particular wavelength and which can be made to fluoresce, after such conversion, by stimulating light radiation of a longer wavelength. A fluorescent image may be formed and detected by the system.
Inventors
- 👤 G Dorion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:25
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/122; C07D307/02; C07D307/34; C07D307/38; C07D307/40; C07D307/46; C07D307/56; C07D307/68; C07D493/00; C07D493/02; C07D493/08; C09; C09B; C09B11/00; C09B11/04; C09B11/06; C09B11/08; C09K; C09K11/00; C09K11/06; G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G06; G06K; G06K19/00; G06K19/02; G06K19/06; G06K19/06009; G06K7/00; G06K7/10; G06K7/12; G11; G11C; G11C13/00; G11C13/04; G11C13/048; C07C; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/24; G06K2019/06215; G06K2019/06225
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
76 words
A method for processing information which comprises irradiating with an information containing beam of ultraviolet light not exceeding about 4,000 angstroms in wavelength, a substrate incorporating a fluorescer precursor compound which is non-fluorescent in its initial state, said compound being converted under said ultraviolet light of said information containing beam to a form in which it will fluoresce under stimulating untraviolet light, thereafter irradiating said converted compound with said stimulating light, and detecting the fluorescent emission.
Claim 2
Independent Claim
76 words
A method for processing information which comprises irradiating with an information containing beam of ultraviolet light not exceeding about 4,000 angstroms in wavelength, a substrate incorporating a fluorescer precursor compound which is non-fluorescent in its initial state, said compound being converted under said ultraviolet light of said information containing beam to a form in which it will fluoresce under stimulating untraviolet light, thereafter irradiating said converted compound with said stimulating light, and detecting the fluorescent emission.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein said fluorescer precursor compound is 2-(2-furyl)-3-acylchromone.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said fluorescer precursor compound is a 2-(2-thienyl)-3-acylchromone.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein said stimulating light has a wavelength greater than said converting given wavelength.
Claim 6
Dependent Claim
14 words
The method of claim 1 wherein said fluorescer precursor is coated on a substrate.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein said fluorescer precursor is incorporated in a film which is the substrate.
Claim 8
Dependent Claim
26 words
The method of claim 1 wherein said fluorescer precursor is present as a coating on a substrate over information on said substrate detectable by visible light.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein said fluorescer precursor is applied to said substrate as the initial step of the imageing process.
Claim 10
Dependent Claim
24 words
The method of claim 1 wherein the intensity of said given wavelength light is varied to vary the fluorescence emission under said stimulating light.
References Cited (Backward Citations)
US3418470A
Cited
US3473027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |