US2569940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared phosphors
Assignee: EIDP Inc
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Filing: 1949-12-22
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Granted: 1951-10-02
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Expires: 1969-12-22
Abstract
No abstract record available.
Inventors
- 👤 Donald W Lyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:27
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/67; C09K11/085; C09K11/77; C09K11/7759; C09K11/7764
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A PROCESS FOR THE PRODUCTION OF AN INFRAREDSENSITIVE PHOSPHOR WHICH COMPRISES HEATING TOGETHER IN AN OXIDIZING ATMOSPHERE, AT TEMPERATURES RANGING FROM 800* C.-1300* C. AND UNTIL INFRARED SENSITIVITY IS DEVELOPED, FROM 0.001 TO 0.01% BY WEIGHT OF SAMARIUM, BETWEEN 0.01 AND 1.0% BY WEIGHT OF MANGANESE, AND AN OXIDE OF CALCIUM WITH A STOICHIOMETRIC PROPORTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN OXIDE OF AN ELEMENT FROM THE GROUP ALUMINUM, MOLYBDENUM, SILICON, TIN, TITANIUM AND VANADIUM, AND A COMPOUND OF SAID ELEMENTS WHICH YIELDS AN OXIDE DURING SAID HEATING
Claim 2
Dependent Claim
92 words
A PROCESS FOR THE PRODUCTION OF AN INFRAREDSENSITIVE PHOSPHOR WHICH COMPRISES HEATING TOGETHER IN AN OXIDIZING ATMOSPHERE, AT TEMPERATURES RANGING FROM 800* C.-1300* C. AND UNTIL INFRARED SENSITIVITY IS DEVELOPED, FROM 0.001 TO 0.01% BY WEIGHT OF SAMARIUM, BETWEEN 0.01 AND 1.0% BY WEIGHT OF MANGANESE, AND AN OXIDE OF CALCIUM WITH A STOICHIOMETRIC PROPORTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN OXIDE OF AN ELEMENT FROM THE GROUP ALUMINUM, MOLYBDENUM, SILICON, TIN, TITANIUM AND VANADIUM, AND A COMPOUND OF SAID ELEMENTS WHICH YIELDS AN OXIDE DURING SAID HEATING
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) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |