US3868533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray tube for image display
Assignee: US Philips Corp
•
Filing: 1974-03-06
•
Granted: 1975-02-25
•
Expires: 1994-03-06
Abstract
Abstract Cathode-ray tube for monochrome image display, in particular black-and-white image display. The tube has a luminescent screen which contains a terbium- and samarium-activated oxysulphide according to the formula (M1-x-yTbxSmy)2 O2S, where M is at least one of the elements yttrium, gadolinium, lanthanum and lutetium, and 0.003</=x</=0.030 and 0.0001</=y</=0.005. Up to 90 atomic per cent of the terbium may be replaced by dysprosium.
Inventors
- 👤 Roelof Egbert Schuil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:08
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/7771
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
CATHODE-RAY TUBE FOR BLACK-AND-WHITE IMAGE DISPLAY, PROVIDED WITH A LUMINESCENT SCREEN WHICH CONTAINS A LUMINESCENT TERBIUMACTIVATED OXYSULPHIDE OF AT LEAST ONE OF THE ELEMENTS YTTRIUM, GADLINIUM, LANTHANUM AND LUTERTIUM, CHARACTERIZED IN THE OXYSULPHIDE ALSO CONTAINS SAMERIUM AS AN ACTIVATOR AND SATISFIES THE FORMULA (M1-X-Y TBX SMY)2 O2S, WHERE M IS AT LEAST ONE OF THE ELEMENTS YTTRIUM, GADOLINIUM, LANTHAUM AND LUTERIUM, AND 0.003 X 0.030 AND 0.0001 Y 0.005, SAID OXYSULFIDE EXHIBITING A WHIET COLOR EMISIO UNDER CATHODE RAY EXCITATION.
Claim 2
Dependent Claim
80 words
CATHODE-RAY TUBE FOR BLACK-AND-WHITE IMAGE DISPLAY, PROVIDED WITH A LUMINESCENT SCREEN WHICH CONTAINS A LUMINESCENT TERBIUMACTIVATED OXYSULPHIDE OF AT LEAST ONE OF THE ELEMENTS YTTRIUM, GADLINIUM, LANTHANUM AND LUTERTIUM, CHARACTERIZED IN THE OXYSULPHIDE ALSO CONTAINS SAMERIUM AS AN ACTIVATOR AND SATISFIES THE FORMULA (M1-X-Y TBX SMY)2 O2S, WHERE M IS AT LEAST ONE OF THE ELEMENTS YTTRIUM, GADOLINIUM, LANTHAUM AND LUTERIUM, AND 0.003 X 0.030 AND 0.0001 Y 0.005, SAID OXYSULFIDE EXHIBITING A WHIET COLOR EMISIO UNDER CATHODE RAY EXCITATION.
Claim 3
Dependent Claim
23 words
Cathode-ray tube as claimed in claim 1, characterized in that up to 90 atomic per cent of the terbium is replaced by dysprosium.
Claim 4
Dependent Claim
15 words
Cathode-ray tube as claimed in claim 2, characterized in that M is yttrium and/or gadolinium.
Claim 5
Dependent Claim
15 words
Cathode-ray tube as claimed in claim 1 characterized in that M is yttrium and/or gadolinium.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |