US3699478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display system
Assignee: AT&T Inc
•
Filing: 1969-05-26
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Granted: 1972-10-17
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Expires: 1989-05-26
Abstract
Abstract A black and white display is produced by projection using a scanning argon laser beam operating at 4,880 A and a phosphorescent screen of cerium-doped yttrium aluminum garnet which emits a broad range of frequencies centering about 5,500 A. The yellowish cast of the phosphor output is compensated by a small amount of reflected blue argon light.
Inventors
- 👤 Douglas A Pinnow
- 👤 Le Grand G Van Uitert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:01
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7774; H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3129
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
42 words
ApparatUs of claim 1 in which the said phosphorescent composition and screen design are such that a portion of the laser emission is unconverted so that the combination of reflected laser emission and the Mu emission from the screen appears approximately white.
Claim 2
Dependent Claim
12 words
Apparatus of claim 1 in which the laser is an argon-ion laser.
Claim 3
Dependent Claim
12 words
Apparatus of claim 1 in which the laser is a cadmium-ion laser.
Claim 4
Dependent Claim
14 words
Apparatus of claim 1 in which the phosphor composition consists essentially of Y3 xCexAl5O12.
Claim 5
Dependent Claim
25 words
Apparatus of claim 1 in which the said first means is an electro-optic modulator and in which the said second means is an acousto-optic deflector.
Claim 6
Dependent Claim
17 words
Apparatus of claim 1 in which the said first and second means depend upon an acousto-optic interaction.
Claim 7
Dependent Claim
15 words
Apparatus of claim 7 in which said first and second means constitute a single unit.
References Cited (Backward Citations)
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Cited
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US3524011A
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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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |