US3683336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formation of visible and/or fluorescent images
Assignee: Wyeth Holdings LLC
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Filing: 1969-08-08
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Granted: 1972-08-08
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Expires: 1989-08-08
Abstract
Abstract Method of processing information by the use of derivatives of aromatic compounds which do not fluoresce, but which may be converted to fluorescent compounds by the action of heat or short wave ultraviolet radiation, and reconverted to the original nonfluorescent form by longer wavelength ultraviolet radiation.
Inventors
- 👤 Thomas Harland Brownlee
- 👤 Ken Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:41
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/28; G; G03; G03C; G03C1/00; G03C1/72; G03C1/73
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
14 words
The process of claim 1 wherein said polycyclic aromatic compound is an aromatic endoperoxide.
Claim 2
Dependent Claim
12 words
The process of claim 1 where said energy is thermal contact energy.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said energy is actinic radiation.
Claim 4
Dependent Claim
12 words
The process of claim 4 wherein said actinic radiation is infrared radiation.
Claim 5
Dependent Claim
14 words
The process of claim 4 wherein said actinic radiation is short wave ultraviolet radiation.
Claim 6
Dependent Claim
43 words
The process of claim 1 wherein said energy applied is applied to the oxidized state and is sufficient for reduction so as to form a fluorescent pattern, and said pattern is erased by applying long wave ultraviolet radiation in the presence of air.
Claim 7
Dependent Claim
77 words
An information storage and retrieval process which comprises irradiating a substrate with a differential energy pattern of activating light, said substrate including a polycyclic aromatic compound having an oxidized and a reduced state, and being fluorescent in said reduced state, said compound being capable of being oxidized by long wave ultraviolet radiation, and reduced by short wave ultraviolet and lower, or infrared radiation, said energy used for irradiating being that which changes the state of said compound.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |