US2668148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thallium activated calcium phosphate phosphor containing aluminum
Assignee: Hartford National Bank and Trust Co
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Filing: 1951-11-07
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Granted: 1954-02-02
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Expires: 1971-11-07
Abstract
No abstract record available.
Inventors
- 👤 Kroger Ferdinand Anne
- 👤 Boomgaard Jan Van Den
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:03
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/70; C09K11/71
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
LUMINESCENT MATERIAL CONSISTING OF CALCIUMORTHOPHOSPHATE WHICH IS ACTIVATED BY THALLIUM, SAID MATERIAL HAVING A CRYSTAL LATTICE COMPRISING ALUMINIUM, THE RATIO BETWEEN THE SUM OF THE ELEMENTS CALCIUM, ALUMINIUM AND THALLIUM AND THE SUPPLY OF PHOSPHORUS BEING BETWEEN 3:2 AND 2:4:2, THE RATIO BETWEEN ALUMINIUM AND THALLIUM BEING BETWEEN 0:5:1 AND 2:1.
Claim 2
Dependent Claim
51 words
LUMINESCENT MATERIAL CONSISTING OF CALCIUMORTHOPHOSPHATE WHICH IS ACTIVATED BY THALLIUM, SAID MATERIAL HAVING A CRYSTAL LATTICE COMPRISING ALUMINIUM, THE RATIO BETWEEN THE SUM OF THE ELEMENTS CALCIUM, ALUMINIUM AND THALLIUM AND THE SUPPLY OF PHOSPHORUS BEING BETWEEN 3:2 AND 2:4:2, THE RATIO BETWEEN ALUMINIUM AND THALLIUM BEING BETWEEN 0:5:1 AND 2:1.
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) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |