US3723787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Red luminescent europium activated yttrium oxychloride phosphor and color television display tubes containing said phosphor
Assignee: US Philips Corp
•
Filing: 1970-03-06
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Granted: 1973-03-27
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Expires: 1990-03-06
Abstract
Abstract Europium activated red luminescing phosphor for color television, said phosphor being a trivalent europium activated oxychloride of an element such as a rare earth metal such as yttrium, lanthanum and gadolinium.
Inventors
- 👤 G Blasse
- 👤 Vries J De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:32
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7784; C09K11/7787; C09K11/7788
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
The red luminescing phosphor of claim 1 wherein 0.01 < or = x < or = 0.06.
Claim 2
Dependent Claim
18 words
A color television display tube containing as the red luminescing phosphor a red luminescent phosphor of claim 1.
References Cited (Backward Citations)
US2729605A
Cited
US3415757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |