US2499307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barium di-silicate phosphor
Assignee: GTE Sylvania Inc
•
Filing: 1946-01-03
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Granted: 1950-02-28
•
Expires: 1966-01-03
Abstract
No abstract record available.
Inventors
- 👤 Robert J Ginther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:39
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/66; C09K11/666
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
A FLUORESCENT MATERIAL CONSISTING ESSENTIALLY OF LEAD-ACTIVATED BARIUM SILICATE IN WHICH THE MOLAR RATIO OF SILICA TO BARIUM IS NOT LESS THAN 2 NOR GREATER THAN 4.5.
Claim 2
Dependent Claim
27 words
A FLUORESCENT MATERIAL CONSISTING ESSENTIALLY OF LEAD-ACTIVATED BARIUM SILICATE IN WHICH THE MOLAR RATIO OF SILICA TO BARIUM IS NOT LESS THAN 2 NOR GREATER THAN 4.5.
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) | 1953-02-27 | 1953-08-29 | 1954-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-27 | 1957-08-29 | 1958-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-27 | 1961-08-29 | 1962-02-28 | $7700.00 | Window Closed / Lapsed |