US2542322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing calcium silicate phosphor
Assignee: General Electric Co
•
Filing: 1949-08-15
•
Granted: 1951-02-20
•
Expires: 1969-08-15
Abstract
No abstract record available.
Inventors
- 👤 Herman C Froelich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:05
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/66; C09K11/666
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
THE METHOD OF PREPARING A FLUORESCENT COMPOSITION OF MANGANESE AND LEAD ACTIVATED CALCIUM SILICATE WHICH COMPRISES MIXING COMPOUNDS OF CALCIUM AND SILICON WHICH WHEN HEATED WILL REACT TO FORM CALCIUM SILICATE WITH ACTIVATING PROPORTIONS OF MANGANESE AND LEAD COMPOUNDS, AND FIRING THE MIXTURE AT A TEMPERATURE OF APPROXIMATELY 1000-12000* C. WITH ADDITIONS OF CATALYST CONSISTING OF BOTH A FLUORIDE AND A CHLORIDE OF THE GROUP CONSISTING OF FLUORIDES AND CHLORIDES OF CALCIUM AND AMMONIUM IN A TOTAL AMOUNT OF ABOUT 0.1-10% BY WEIGHT AND WHEREIN THE MOL RATIO OF FLUORINE TO CHLORINE IS BETWEEN ABOUT 0.2:2 AND 2:0.2.
Claim 2
Independent Claim
98 words
THE METHOD OF PREPARING A FLUORESCENT COMPOSITION OF MANGANESE AND LEAD ACTIVATED CALCIUM SILICATE WHICH COMPRISES MIXING COMPOUNDS OF CALCIUM AND SILICON WHICH WHEN HEATED WILL REACT TO FORM CALCIUM SILICATE WITH ACTIVATING PROPORTIONS OF MANGANESE AND LEAD COMPOUNDS, AND FIRING THE MIXTURE AT A TEMPERATURE OF APPROXIMATELY 1000-12000* C. WITH ADDITIONS OF CATALYST CONSISTING OF BOTH A FLUORIDE AND A CHLORIDE OF THE GROUP CONSISTING OF FLUORIDES AND CHLORIDES OF CALCIUM AND AMMONIUM IN A TOTAL AMOUNT OF ABOUT 0.1-10% BY WEIGHT AND WHEREIN THE MOL RATIO OF FLUORINE TO CHLORINE IS BETWEEN ABOUT 0.2:2 AND 2:0.2.
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) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |