US2567769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline earth oxysulfide phosphor
Assignee: Cinema Television Ltd
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Filing: 1948-02-19
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Granted: 1951-09-11
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Expires: 1968-02-19
Abstract
No abstract record available.
Inventors
- 👤 Head Richard Beaumont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:42
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7701; C09K11/7703
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A MATERIAL LUMINESCENT TO CATHODE RAYS COMPRISING AN OXYSULPHIDE OF AN ALKALINE EARTH METAL ACTIVATED BY A RARE EARTH COMPOUND SELECTED FROM THE GROUP CONSISTING OF CERIUM COMPOUNDS, YTTRIUM COMPOUNDS, THORIUM COMPOUNDS AND DYSPROSIUM COMPOUNDS IN A PROPORTION SO AS TO GIVE A CONCENTRATION OF RARE EARTH IN THE MATERIAL OF BETWEEN 0.05% AND 0.5% BY WEIGHT.
Claim 2
Dependent Claim
57 words
A MATERIAL LUMINESCENT TO CATHODE RAYS COMPRISING AN OXYSULPHIDE OF AN ALKALINE EARTH METAL ACTIVATED BY A RARE EARTH COMPOUND SELECTED FROM THE GROUP CONSISTING OF CERIUM COMPOUNDS, YTTRIUM COMPOUNDS, THORIUM COMPOUNDS AND DYSPROSIUM COMPOUNDS IN A PROPORTION SO AS TO GIVE A CONCENTRATION OF RARE EARTH IN THE MATERIAL OF BETWEEN 0.05% AND 0.5% BY WEIGHT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-10 | 1955-03-12 | 1955-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-10 | 1959-03-12 | 1959-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-10 | 1963-03-12 | 1963-09-11 | $7700.00 | Window Closed / Lapsed |