US4559469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Green emitting phosphor and cathode-ray tube provided with such a phosphor
Assignee: US Philips Corp
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Filing: 1985-04-19
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Granted: 1985-12-17
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Expires: 2005-04-19
Abstract
Abstract A green emitting phosphor for heavily loaded cathode-ray tubes comprises a mixture of a deep-green and a yellowish-green emitting phosphor. Mixtures of Zn2SiO4:Mn and at least one phosphor from the group comprising Y2SiO5:Tb; X2O2S:Tb; ES:Ce and XOZ:Tb, where X=Y, La, Gd, Lu; E=Ca, Sr, Ba; and Z=Cl, Br, I, F; satisfy, as FIG. 1 illustrates for a few examples, the EBU specification.
Inventors
- 👤 Thomas Welker
- 👤 Klaus Carl
- 👤 Wolfram Czarnojan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:38
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/187; H01J29/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
A green emitting phosphor composition for heavily loaded cathode-ray tubes, which phosphor composition consists of a mixture of a deep green emitting phosphor of the formula Zn 2 SiO 4 :Mn and a yellowish-green emitting phosphor, of the formula XOZ:Tb in the following weight ratios: Zn 2 SiO 4 :Mn:XOZ:Tb=4:6 to 6:4 where X is at least one element selected from the group consisting of Y, La, Gd and Lu and Z is at least one of the elements selected from the group consisting of Cl, Br, I and F, said phosphor composition exhibiting color coordinates x and y within the tetragon with broken side lines in FIG. 1.
Claim 2
Dependent Claim
109 words
A green emitting phosphor composition for heavily loaded cathode-ray tubes, which phosphor composition consists of a mixture of a deep green emitting phosphor of the formula Zn 2 SiO 4 :Mn and a yellowish-green emitting phosphor, of the formula XOZ:Tb in the following weight ratios: Zn 2 SiO 4 :Mn:XOZ:Tb=4:6 to 6:4 where X is at least one element selected from the group consisting of Y, La, Gd and Lu and Z is at least one of the elements selected from the group consisting of Cl, Br, I and F, said phosphor composition exhibiting color coordinates x and y within the tetragon with broken side lines in FIG. 1.
Claim 3
Dependent Claim
29 words
The green emitting phosphor composition of claim 1 wherein the phosphor composition consists of the following mixture in the following weight ratios: Zn 2 SiO 4 :Mn:LaOBr:Tb=4:6 to 6:4.
Claim 4
Dependent Claim
13 words
A cathode-ray tube provided with a phosphor composition as claimed in claim 2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |