US3825436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making rare earth oxysulfide luminescent film
Assignee: Lockheed Martin Corp
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Filing: 1972-10-04
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Granted: 1974-07-23
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Expires: 1992-10-04
Abstract
Abstract THIS INVENTION RELATES TO HIGH BRIGHTNESS, HIGH CONTRAST, HIGH RESOLUTION RARE EARTH CRYSTALLINE LUMINESCENT FILMS AND PROCESSES FOR MAKING SUCH FILMS. MORE PARTICULARLY, THE FILMS ARE RARE EARTH, CRYSTALLINE OXYSULFIDES OF LANTHANUM, GADOLINIUM, YTTRIUM AND LUTETIUM ACTIVATED WITH TRIVALENT RARE EARTH IONS HAVING ATOMIC NUMBERS FROM 59 THROUGH 70.
Inventors
- 👤 R Buchanan
- 👤 R Alves
- 👤 T Maple
- 👤 L Sobon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:18
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/7771; Y; Y10; Y10S; Y10S206/00; Y10S206/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |