US2824072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Germanium-activated phosphor
Assignee: GTE Sylvania Inc
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Filing: 1951-03-17
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Granted: 1958-02-18
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Expires: 1971-03-17
Abstract
No abstract record available.
Inventors
- 👤 Keith H Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:09
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/70; C09K11/71
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A GERMANIUM-ACTIVATED CALCIUM PHOSPHATE PHOSPHOR, IN WHICH THE RATIO OF THE NUMBER OF GRAM-ATOMS OF CALCIUM TO THE NUMBER OF GRAM-MOLES OF THE PHOSPHATE RADICALS IS LESS THAN 3.00/2.00 BUT GREATER THAN 2.70/2.00, AND IN WHICH THE GERMANIUM IS DIVALENT AND ITS CONTENT IS BETWEEN ABOUT 0.002 GRAM-ATOM AND 0.2 GRAM-ATOMS TO TWO GRAM MOLES OF PHOSPHATE RADICAL.
Claim 2
Dependent Claim
58 words
A GERMANIUM-ACTIVATED CALCIUM PHOSPHATE PHOSPHOR, IN WHICH THE RATIO OF THE NUMBER OF GRAM-ATOMS OF CALCIUM TO THE NUMBER OF GRAM-MOLES OF THE PHOSPHATE RADICALS IS LESS THAN 3.00/2.00 BUT GREATER THAN 2.70/2.00, AND IN WHICH THE GERMANIUM IS DIVALENT AND ITS CONTENT IS BETWEEN ABOUT 0.002 GRAM-ATOM AND 0.2 GRAM-ATOMS TO TWO GRAM MOLES OF PHOSPHATE RADICAL.
References Cited (Backward Citations)
US2619471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-17 | 1961-08-19 | 1962-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-17 | 1965-08-19 | 1966-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-17 | 1969-08-19 | 1970-02-18 | $7700.00 | Window Closed / Lapsed |