US3922233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
White emitting phosphors
Assignee: Dai Nippon Toryo Co Ltd
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Filing: 1974-10-15
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Granted: 1975-11-25
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Expires: 1994-10-15
Abstract
Abstract A mixture of yellowish green-to-yellow emitting, gold- and aluminum-activated zinc sulfide and blue-emitting silveractivated zinc sulfide, in which the weight ratio of the latter to the former is within a range of 0.7 to 1.30, is valuable as a white-emitting phosphor for black and white television. When at least one red-emitting phosphor selected from europium-activated yttrium oxysulfide, europium-activated yttrium oxide and europium-activated yttrium vanadate is incorporated into the above white-emitting phosphor, the resulting composite can cover a more wide white region for black and white television.
Inventors
- 👤 Tatsuki Torii
- 👤 Yoshihisa Nagashima
- 👤 Haruhiko Kitamura
- 👤 Etsuo Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:32
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/64; C09K11/641; C09K11/642
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
A WHITE-EMITTING PHOSPHOR FOR BLACK AND WHITE TELEVISION WHICH CONSISTS ESSENTIALLY OF A MIXTURE OF A YELLOWISH GREEN-TYELLOW EMITTING, GOLD- AND ALUMINUM-ACTIVATING GOLD IS WITHIN A PHOSPHOR IN WHICH THE AMOUNT OF ACTIVATING FOLD IS WITHIN A RANGE OF 5X 10**-4 G TO 10**-2 G PER G OF ZINC SULFIDE AND THE AMOUTN OF ACTIVATING ALUMINUM IS WITHIN A RANGE OF 2.5X10**-4 G TO 5X10**-4 PER G OF ZINC SULFIDE AND A BLUE-EMITTING SILVERACTIVATED ZINC SULFIDE PHOSPHOR IN WHICH THE AMOUNT OF ACTIVATING SILVER IS WITHIN A RANGE OF 10**-5 G TO 10**-3 G PER G OF ZINC SULFIDE, WHEREIN THE WEIGHT RATIO OF THE SILVER-ACTIVATED ZINC SULFIDE TO THE GOLD- AND ALUMINUM- ACTIVATED ZINC SULFIDE IS WHEREIN A RANGE OF 0.70 TO 1.30.
Claim 2
Dependent Claim
124 words
A WHITE-EMITTING PHOSPHOR FOR BLACK AND WHITE TELEVISION WHICH CONSISTS ESSENTIALLY OF A MIXTURE OF A YELLOWISH GREEN-TYELLOW EMITTING, GOLD- AND ALUMINUM-ACTIVATING GOLD IS WITHIN A PHOSPHOR IN WHICH THE AMOUNT OF ACTIVATING FOLD IS WITHIN A RANGE OF 5X 10**-4 G TO 10**-2 G PER G OF ZINC SULFIDE AND THE AMOUTN OF ACTIVATING ALUMINUM IS WITHIN A RANGE OF 2.5X10**-4 G TO 5X10**-4 PER G OF ZINC SULFIDE AND A BLUE-EMITTING SILVERACTIVATED ZINC SULFIDE PHOSPHOR IN WHICH THE AMOUNT OF ACTIVATING SILVER IS WITHIN A RANGE OF 10**-5 G TO 10**-3 G PER G OF ZINC SULFIDE, WHEREIN THE WEIGHT RATIO OF THE SILVER-ACTIVATED ZINC SULFIDE TO THE GOLD- AND ALUMINUM- ACTIVATED ZINC SULFIDE IS WHEREIN A RANGE OF 0.70 TO 1.30.
Claim 3
Dependent Claim
31 words
A white emitting phosphor of claim 1 wherein the weight ratio of the silver-activated zinc sulfide to the gold- and aluminum-activated zinc sulfide is within a range of 0.80 to 1.10.
Claim 4
Dependent Claim
31 words
A white-emitting phosphor of claim 1 wherein the weight ratio of the silver-activated zinc sulfide to the gold- and aluminum-activated zinc sulfide is within a range of from 0.90 to 1.00.
Claim 5
Dependent Claim
197 words
A WHITE-EMITTING PHOSPHOR FOR BLACK AND WHITE TELEVISION WHICH CONSISTS ESSENTIALLY OF A MIXTURE OF A YELLOWISH GREEN-TOYELOW EMITTING, GOLD- AND ALUMINUM:ACTIVATED ZINC SULFIDE PHOSPHOR IB WHICH THE AMOUNT OF ACTIVATING GOLD IS WITHIN A RANGE OF 5X10**-4 G TO 10**-2 G PER G OF ZINC SULFIDE AND THE AMOUNT OF ACTIVATING ALUMINUM IS WITHIN A RANGE OF 2.5X10**4 TO 5X 10**-3 G PER G OF ZINC SULFIDE, A BLUE-EMITTING SILVERACTIVATED ZINC SULFIDE PHOSPHOR IN WHICH THE AMOUNT OF ACTIVATING SILVER IS WITHIN A RANGE OF 10**-5 G TO 10**-3 G PER OF ZINC SULFIDE, AND AT LEAST ONE RED-EMITTING PHOSPHOR SELECTED FROM EUROPIUM-ACTIVATED YTTRIUM OXYSULFIDE, EUROPIUM-ACTIVATED YTTRIUM OXIDE AND EUROPIUM-ACTIVATING EUROPIUM IS WITHIN A EACH OF WHICH THE AMOUNT OF ACTIVATING EUROPIUM IS WITHIN A RANGE OF 1.0X10**-2 G TO 1.5X10**-1 G PER G OF YTTRIUM OXYSULFIDE, YTTRIUM OXIDE OR YTTRIUM VANADATE, WHEREIN THE WEIGHT RATIO OF SAID RED-EMITTING PHOSPHOR TO SAID GOLD-AND ALUMINUM-ACTIVATED ZINC SULFIDE PHOSPHOR IS NOT GREATER THAN 3/7 AND THE WEIGHT RATIO OF THE SILVER-ACTIVATED ZINC SULFIDE PHOSPHOR TO THE SUM OF THE GOLD- AND ALUMINUM-ACTIVATED ZINC SULFIDE SULFIDE PHOSPHOR AND THE RED-EMITTING PHOSPHOR IS WITHIN A RANGE OF 0.70 TO 1.30.
Claim 6
Dependent Claim
197 words
A WHITE-EMITTING PHOSPHOR FOR BLACK AND WHITE TELEVISION WHICH CONSISTS ESSENTIALLY OF A MIXTURE OF A YELLOWISH GREEN-TOYELOW EMITTING, GOLD- AND ALUMINUM:ACTIVATED ZINC SULFIDE PHOSPHOR IB WHICH THE AMOUNT OF ACTIVATING GOLD IS WITHIN A RANGE OF 5X10**-4 G TO 10**-2 G PER G OF ZINC SULFIDE AND THE AMOUNT OF ACTIVATING ALUMINUM IS WITHIN A RANGE OF 2.5X10**4 TO 5X 10**-3 G PER G OF ZINC SULFIDE, A BLUE-EMITTING SILVERACTIVATED ZINC SULFIDE PHOSPHOR IN WHICH THE AMOUNT OF ACTIVATING SILVER IS WITHIN A RANGE OF 10**-5 G TO 10**-3 G PER OF ZINC SULFIDE, AND AT LEAST ONE RED-EMITTING PHOSPHOR SELECTED FROM EUROPIUM-ACTIVATED YTTRIUM OXYSULFIDE, EUROPIUM-ACTIVATED YTTRIUM OXIDE AND EUROPIUM-ACTIVATING EUROPIUM IS WITHIN A EACH OF WHICH THE AMOUNT OF ACTIVATING EUROPIUM IS WITHIN A RANGE OF 1.0X10**-2 G TO 1.5X10**-1 G PER G OF YTTRIUM OXYSULFIDE, YTTRIUM OXIDE OR YTTRIUM VANADATE, WHEREIN THE WEIGHT RATIO OF SAID RED-EMITTING PHOSPHOR TO SAID GOLD-AND ALUMINUM-ACTIVATED ZINC SULFIDE PHOSPHOR IS NOT GREATER THAN 3/7 AND THE WEIGHT RATIO OF THE SILVER-ACTIVATED ZINC SULFIDE PHOSPHOR TO THE SUM OF THE GOLD- AND ALUMINUM-ACTIVATED ZINC SULFIDE SULFIDE PHOSPHOR AND THE RED-EMITTING PHOSPHOR IS WITHIN A RANGE OF 0.70 TO 1.30.
Claim 7
Dependent Claim
31 words
A white-emitting phosphor of claim 4 wherein the weight ratio of said red-emitting phosphor to the gold- and aluminum-activated zinc sulfide phosphor is within a range of 3/17 to 1/3 .
Claim 8
Dependent Claim
25 words
A white-emitting phosphor of claim 4 wherein the weight ratio of the red-emitting phosphor to the gold- and aluminum-activated zinc sulfide phosphor is 1/4 .
Claim 9
Dependent Claim
40 words
A white-emitting phosphor of claim 4 wherein the weight ratio of the silver-activated zinc sulfide phosphor to the sum of said gold- and aluminum-activated zinc sulfide phosphor and said red-emitting phosphor is within a range of from 0.80 to 1.10.
Claim 10
Dependent Claim
41 words
A white-emitting phosphor of claim 4 wherein the weight ratio of the silver-activated zinc sulfide phosphor to the mixed phosphor of the gold- and aluminum- activated zinc sulfide phosphor and the red-emitting phosphor is within a range of 0.90 - 1.00.
References Cited (Backward Citations)
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US2219929A
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US2461726A
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US2623857A
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US2623858A
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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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |