US4806822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube containing zinc silicate phosphor
Assignee: Toshiba Corp
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Filing: 1987-11-23
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Granted: 1989-02-21
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Expires: 2007-11-23
Abstract
Abstract Zinc silicate phosphor emitting green for cathode ray tubes with a long persistence, which does not contain arsenic. -Formula aZnO.SiO2:Mnx,Iny -in which the conditions 1.5 </= a </= 2 - 5 x 10-5 </= x </= 3 x 10-2 - 1 x 10-5 </= y </= 1 x 10-2 - are satisfied.
Inventors
- 👤 Takeshi Takahara
- 👤 Tsutomu Ishii
- 👤 Mitsuhiro Oikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:25
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/62; C09K11/621; C09K11/623; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
A cathode ray tube comprising an evacuated envelope, an electron excitation source and a screen containing a zinc silicate phosphor thereon, which consists essentially of a composition of the stoichiometric formula: aZnO.SiO.sub.2 :Mn.sub.x, In.sub.y which composition is substantially free of arsenic and wherein a is a number of from about 1.5 to about 2, x is a number of from about 5×10 -5 to about 3×10 -2 , and y is a number of from about 1×10 -5 to about 1×10 -2 .
Claim 2
Dependent Claim
83 words
A cathode ray tube comprising an evacuated envelope, an electron excitation source and a screen containing a zinc silicate phosphor thereon, which consists essentially of a composition of the stoichiometric formula: aZnO.SiO.sub.2 :Mn.sub.x, In.sub.y which composition is substantially free of arsenic and wherein a is a number of from about 1.5 to about 2, x is a number of from about 5×10 -5 to about 3×10 -2 , and y is a number of from about 1×10 -5 to about 1×10 -2 .
Claim 3
Dependent Claim
37 words
The cathode ray tube of claim 1, wherein x is in the range of about 1×10 -3 to about 1×10 -2 , and y is in the range of about 1×10 -4 to about 5×10 -3 .
Claim 4
Dependent Claim
24 words
The cathode ray tube of claim 1, wherein a is about 1.9, x is about 7×10 -3 and y is about 1×10 -3 .
Claim 5
Dependent Claim
46 words
The cathode ray tube of claim 1, wherein the composition is selected from the group of compositions having the following formulas: 1.6 ZnO.SiO.sub.2 : Mn.sub.0.008, In.sub.0.0005 1.8 ZnO.SiO.sub.2 : Mn.sub.0.005, In.sub.0.002 1.9 ZnO.SiO.sub.2 : Mn.sub.0.007, In.sub.0.001 1.75 ZnO.SiO.sub.2 : Mn.sub.0.004, In.sub.0.0001 1.95 ZnO.SiO.sub.2 : Mn.sub.0.009, In.sub.0.005.
References Cited (Backward Citations)
DE834417C
Cited
US4231892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
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