US2575755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali stabilized calcium phosphate phosphor
Assignee: General Electric Co
•
Filing: 1950-10-26
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Granted: 1951-11-20
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Expires: 1970-10-26
Abstract
No abstract record available.
Inventors
- 👤 Herman C Froelich
- 👤 Joseph M Margolis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:23
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7715; C09K11/7723; C09K11/7724
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A FLUORESCENT COMPOSITION, CONSISTING ESSENTIALLY OF CALCIUM ORTHOPHOSPHATE AND MANGANESE AND TRIVALENT CERIUM IN ACTIVATOR PROPORTIONS AND AN ALKALI METAL IN AN AMOUNT OF ABOUT .001 TO .05 MOLE ALKALI OXIDE PER MOLE CAO IN THE PHOSPHOR.
Claim 2
Dependent Claim
37 words
A FLUORESCENT COMPOSITION, CONSISTING ESSENTIALLY OF CALCIUM ORTHOPHOSPHATE AND MANGANESE AND TRIVALENT CERIUM IN ACTIVATOR PROPORTIONS AND AN ALKALI METAL IN AN AMOUNT OF ABOUT .001 TO .05 MOLE ALKALI OXIDE PER MOLE CAO IN THE PHOSPHOR.
References Cited (Backward Citations)
US2241950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |