US3320180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoluminescent doubly doped lif phosphor
Assignee: Kewanee Oil Co
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Filing: 1963-11-07
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Granted: 1967-05-16
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Expires: 1983-11-07
Abstract
No abstract record available.
Inventors
- 👤 Carl F Swinehart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:03
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/0827; C09K11/0833; G; G01; G01T; G01T1/00; G01T1/02; G01T1/10; G01T1/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A THERMOLUMINESCENT MATERIAL CONSISTING ESSENTIALLY OF A CRYSTAL OF LITHIUM FLUORIDE DOPED WITH ACTIVATORS COMPOSED OF FROM ABOUT 40 TO ABOUT 400 PARTS PER MILLION OF AT LEAST ONE MEMBER OF A FIRST GROUP CONSISTING OF MAGNESIUM, CALCIUM, AND BARIUM, WHEN SUCH MEMBER IS EXPRESSED AS THE FLUORIDE, AND AT LEAST ONE MEMBER OF A SECOND GROUP CONSISTING OF ALUMINUM, TITANIUM, AND EUROPIUM, SAID MEMBER OF SAID SECOND JGROUP BEING USED IN AN AMOUNT OF 20 TO 200 PARTS PER MILLION PARTS OF LITHIUM FLUORIDE WHEN SAID SECOND GROUP MEMBER IS EXPRESSED AS LITHIUM CRYOLITE OR EUROPIUM FLUORIDE, AND AN AMOUNT OF 20-60 PARTS PER MILLION PARTS OF LITHIUM FLUORIDE WHEN SAID SECOND GROUP MEMBER IS EXPRESSED AS LITHIUM FLUOTITANATE.
Claim 2
Dependent Claim
120 words
A THERMOLUMINESCENT MATERIAL CONSISTING ESSENTIALLY OF A CRYSTAL OF LITHIUM FLUORIDE DOPED WITH ACTIVATORS COMPOSED OF FROM ABOUT 40 TO ABOUT 400 PARTS PER MILLION OF AT LEAST ONE MEMBER OF A FIRST GROUP CONSISTING OF MAGNESIUM, CALCIUM, AND BARIUM, WHEN SUCH MEMBER IS EXPRESSED AS THE FLUORIDE, AND AT LEAST ONE MEMBER OF A SECOND GROUP CONSISTING OF ALUMINUM, TITANIUM, AND EUROPIUM, SAID MEMBER OF SAID SECOND JGROUP BEING USED IN AN AMOUNT OF 20 TO 200 PARTS PER MILLION PARTS OF LITHIUM FLUORIDE WHEN SAID SECOND GROUP MEMBER IS EXPRESSED AS LITHIUM CRYOLITE OR EUROPIUM FLUORIDE, AND AN AMOUNT OF 20-60 PARTS PER MILLION PARTS OF LITHIUM FLUORIDE WHEN SAID SECOND GROUP MEMBER IS EXPRESSED AS LITHIUM FLUOTITANATE.
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) | 1970-05-15 | 1970-11-14 | 1971-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-15 | 1974-11-14 | 1975-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-15 | 1978-11-14 | 1979-05-16 | $7700.00 | Window Closed / Lapsed |