US3891886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube having a luminescent screen including a two component white-emitting phosphoric mixture
Assignee: RCA Licensing Corp
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Filing: 1971-03-10
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Granted: 1975-06-24
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Expires: 1991-03-10
Abstract
Abstract A novel cathode ray tube such as a picture tube for a black-andwhite television receiver. The tube has a luminescent screen including a white-emitting mixture consisting essentially of (a) a blue-emitting silver activated zinc sulfide phosphor and (b) a yellow-emitting copper-and-aluminum activated zinc cadmium sulfide phosphor having a copper content between 0.001 and 0.009 weight percent and an aluminum content not less than the copper content.
Inventors
- 👤 Leo Woontner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:20
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/0805; C09K11/0811; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/187
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
A CATHODE-RAY TUBE COMPRISING AN EVACUATED ENVELOPE, A LUMINESCENT SCREEN WITHIN SAID ENVELOPE AND ELECTRON-PRODUCING MEANS FOR EXCITING SAID SCREEN TO LUMINESCENCE WITHIN SAID ENVELOPE, SAID LUMINESCENT SCREEN INCLUDING AT LEAST ONE WHITE-EMITTING AREA CONSISTING ESSENTIALLY OF A MIXTURE OF: A. 54 TO 58 WEIGHT PERCENT OF A BLUE-EMITTING SILVER-ACTIVATED ZINC SULFIDE PHOSPHOR CONTAINING BETWEEN 0.010 AND 0.030 WEIGHT PERCENT SILVER AND B. 46 TO 42 WEIGHT PERCENT OF A YELLOW-EMMITTING COPPER-ANDALUMINUM-ACTIVATED ZINC CADMINUM SULFIDE PHOSPHOR HAVING THE COMPOSITION MZNS.NCDS:CU(O),AL(P) WHEREIN: M IS BETWEEN 0.83 AND 0.88 PARTS BY WEIGHT N IS BETWEEN 0.12 AND 0.17 PARTS BY WEIGHT, M PLUS N EQUALS 1.0 O IS BETWEEN 0.001 AND 0.009 WEIGHT PERCENT AND P IS NOT LESS THAN O.
Claim 2
Dependent Claim
119 words
A CATHODE-RAY TUBE COMPRISING AN EVACUATED ENVELOPE, A LUMINESCENT SCREEN WITHIN SAID ENVELOPE AND ELECTRON-PRODUCING MEANS FOR EXCITING SAID SCREEN TO LUMINESCENCE WITHIN SAID ENVELOPE, SAID LUMINESCENT SCREEN INCLUDING AT LEAST ONE WHITE-EMITTING AREA CONSISTING ESSENTIALLY OF A MIXTURE OF: A. 54 TO 58 WEIGHT PERCENT OF A BLUE-EMITTING SILVER-ACTIVATED ZINC SULFIDE PHOSPHOR CONTAINING BETWEEN 0.010 AND 0.030 WEIGHT PERCENT SILVER AND B. 46 TO 42 WEIGHT PERCENT OF A YELLOW-EMMITTING COPPER-ANDALUMINUM-ACTIVATED ZINC CADMINUM SULFIDE PHOSPHOR HAVING THE COMPOSITION MZNS.NCDS:CU(O),AL(P) WHEREIN: M IS BETWEEN 0.83 AND 0.88 PARTS BY WEIGHT N IS BETWEEN 0.12 AND 0.17 PARTS BY WEIGHT, M PLUS N EQUALS 1.0 O IS BETWEEN 0.001 AND 0.009 WEIGHT PERCENT AND P IS NOT LESS THAN O.
Claim 3
Dependent Claim
19 words
The tube defined in claim 1 wherein the composition of said blue-emitting phosphor is ZnS:Ag(0.010 to 0.030 weight percent).
Claim 4
Dependent Claim
37 words
The tube defined in claim 2 wherein a. the composition of said blue-emitting phosphor is ZnS:Ag (0.020 weight percent) and b. the composition of said yellow-emitting phosphor is 0.85ZnS.0.15 CdS:Cu (0.007 weight percent), Al (0.007 weight percent).
Claim 5
Dependent Claim
14 words
The tube defined in claim 1 wherein the ratio of o/p is about 3/5.
Claim 6
Dependent Claim
22 words
The tube defined in claim 4 wherein the composition of said yellow-emitting phosphor is 0.85ZnS.0.15CdS:Cu (0.003 wEight percent), Al (0.005 weight percent).
References Cited (Backward Citations)
US2461726A
Cited
US3595804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |