Patent US819543A successfully refreshed from Google Patents.
Patent US2525028A successfully refreshed from Google Patents.
US2525028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of silicate phosphors, including firing in the presence of steam
Assignee: General Electric Co
•
Filing: 1946-12-06
•
Granted: 1950-10-10
•
Expires: 1966-12-06
Abstract
No abstract record available.
Inventors
- 👤 Herman C Froelich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:11
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/66; C09K11/666
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
THE METHOD OF PREPARING A FLUORESCENT SILICATE ACTIVATED BY METAL OF THE GROUP CONSISTING OF MANGANESE, LEAD, CERIUM AND MIXTURES OF MANGANESE AND LEAD WHICH COMPRISES FIRIJNG AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 700-1300*C. IN AN ATMOSPHERE CONSISTING AT LEAST PREPONDERANTLY OF STEAM A MIXTURE OF COMPOUNDS OF SILICON AND A METAL IN PROPORTIONS TO FORM SILICATE OF THE SAID METAL AND AN ACTIVATING PROPORTION OF COMPOUND OF THE ACTIVATING METAL, THE SEVERAL SAID COMPOUNDS BEING SELECTED FROM THE GROUP CONSISTING OF THE RESPECTIVE OXIDES AND COMPOUNDS WHICH UPON HEATING BREAK DOWN TO YIELD THOSE OXIDES.
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) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |