US2951767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphor and method
Assignee: Westinghouse Electric Corp
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Filing: 1958-10-29
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Granted: 1960-09-06
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Expires: 1978-10-29
Abstract
No abstract record available.
Inventors
- 👤 Norman C Beese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:41
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/70; C09K11/72; C09K11/73; C09K11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
THE METHOD OF STABILIZING THE LUMEN OUTPUT OF FINELY-DIVIDED PHOSPHOR MATERIAL FOR USE IN FLUORESCENT LAMPS: COMPRISING SUBSTANTIALLY EVENLY DEPOSITING ON THE PHOSPHOR MATERIAL SUBSTANCE OF AT LEAST ONE OF THE GROUP CONSISTING OF BARIUM CHLORIDE AND BARIUM COMPOUND CONVERTIBLE TO BARIUM CARBONATE AT TEMPERATURES OF FROM 300*C. TO 675*C. AND IN THE PRESENCE OF CARBON DIOXIDE AND MOISTURE, AND THE AMOUNT OF SAID SUBSTANCE DEPOSITED ON THE SAID PHOSPHOR, WITH THE BARIUM THEREIN EXPRESSED AS BARIUM OXIDE, CONSTITUTING FROM 0.005% TO 0.14% BY WEIGHT OF SAID PHOSPHOR.
Claim 2
Independent Claim
88 words
THE METHOD OF STABILIZING THE LUMEN OUTPUT OF FINELY-DIVIDED PHOSPHOR MATERIAL FOR USE IN FLUORESCENT LAMPS: COMPRISING SUBSTANTIALLY EVENLY DEPOSITING ON THE PHOSPHOR MATERIAL SUBSTANCE OF AT LEAST ONE OF THE GROUP CONSISTING OF BARIUM CHLORIDE AND BARIUM COMPOUND CONVERTIBLE TO BARIUM CARBONATE AT TEMPERATURES OF FROM 300*C. TO 675*C. AND IN THE PRESENCE OF CARBON DIOXIDE AND MOISTURE, AND THE AMOUNT OF SAID SUBSTANCE DEPOSITED ON THE SAID PHOSPHOR, WITH THE BARIUM THEREIN EXPRESSED AS BARIUM OXIDE, CONSTITUTING FROM 0.005% TO 0.14% BY WEIGHT OF SAID PHOSPHOR.
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) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |