US3744877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dark trace display device employing uv phosphor plus photochromic resin inside the display screen which generates color by means of triplet-to-triplet absorption
Assignee: Wyeth Holdings LLC
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Filing: 1971-06-24
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Granted: 1973-07-10
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Expires: 1991-06-24
Abstract
Abstract An information display screen viewable in high ambient light and darkness using a photochromic material capable of forming a dark trace and a luminescent trace. The photochromic material is molecularly dispensed in a rigid, transparent matrix. The photochromic materials used are polynuclear aromatic hydrocarbons and nitrogen containing heterocyclic compounds.
Inventors
- 👤 R Stamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:59
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; C; C09; C09K; C09K9/00; C09K9/02; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/14; H01J29/18; H01J29/182
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
14 words
The display screen of claim 1 wherein said means is an ultra-violet emitting phosphor.
Claim 2
Dependent Claim
17 words
The display screen of claim 1 wherein said means is a laser emitting in the ultra-violet range.
Claim 3
Dependent Claim
13 words
The display screen of claim 1 wherein said photochromic compound is self erasable.
Claim 4
Dependent Claim
27 words
A display system as in claim 3 including means to provide an X-Y scan of said laser beam, and means to modulate the intensity of said beam.
Claim 5
Dependent Claim
12 words
The display screen of claim 1 wherein said photochromic compound is deuterated.
References Cited (Backward Citations)
US3214383A
Cited
US3329648A
Cited
US3238841A
Cited
US3635544A
Cited
US3453604A
Cited
US3548236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |