US5043096A
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US
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Thermoluminescent material including lanthanum, europium and cerium dopants
Assignee: GIMMEL GERALD K PERSONAL REPRESENTATIVE OF ESTATE OF JOSEPH LINDMAYER
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Filing: 1991-02-07
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Granted: 1991-08-27
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Expires: 2011-02-07
Abstract
Abstract Materials having thermoluminescent properties using a base material and three dopants and made from a process of mixing the parts together, heating the mixture to fuse together, grinding the mass into a fine powder, and reheating the powder. The resultant powder may be combined with a vehicle to form a paint. A fusible salt may be used in making the thermoluminescent material. The dopants are preferably La2O3, Eu2O3 and CeO2.
Inventors
- 👤 Joseph Lindmayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:44
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7784; C09K11/7787; C09K11/7789; C09K11/7786; C09K11/88; C09K11/881; C09K11/885
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
A thermoluminescent material consisting essentially of: (a) a base material consisting of strontium sulfide; (b) a first dopant consisting of between 100 and 1000 parts per million by weight of a lanthanum compound selected from the group consisting of lanthanum oxide, lanthanum halide, lanthanum nitride, and lanthanum sulfide; and (c) a second dopant consisting of between 100 and 1000 parts per million by weight of a europium compound selected from the group consisting of europium oxide, europium halide, europium nitride, and europium sulfide; and (d) a third dopant consisting of between 100 and 1000 parts per million by weight of a cerium compound selected from the group consisting of cerium oxide, cerium halide, cerium nitride, and cerium sulfide: and wherein said thermoluminescent material provides electron trapping with trap depths in the range of between 0.4 eV and 0.7 eV.
Claim 2
Dependent Claim
139 words
A thermoluminescent material consisting essentially of: (a) a base material consisting of strontium sulfide; (b) a first dopant consisting of between 100 and 1000 parts per million by weight of a lanthanum compound selected from the group consisting of lanthanum oxide, lanthanum halide, lanthanum nitride, and lanthanum sulfide; and (c) a second dopant consisting of between 100 and 1000 parts per million by weight of a europium compound selected from the group consisting of europium oxide, europium halide, europium nitride, and europium sulfide; and (d) a third dopant consisting of between 100 and 1000 parts per million by weight of a cerium compound selected from the group consisting of cerium oxide, cerium halide, cerium nitride, and cerium sulfide: and wherein said thermoluminescent material provides electron trapping with trap depths in the range of between 0.4 eV and 0.7 eV.
Claim 3
Dependent Claim
153 words
A thermoluminescent material consisting essentially of: (a) a base material consisting of strontium sulfide; (b) a fusible salt comprising lithium fluoride, there being at most 2 parts lithium fluoride for every 10 parts of base material by weight; (c) a first dopant consisting of between 100 and 1000 parts per million by weight of a lanthanum compound selected from the group consisting of lanthanum oxide, lanthanum halide, lanthanum nitride, and lanthanum sulfide; (d) a second dopant consisting of between 100 and 1000 parts per million by weight of a europium oxide, europium halide, europium nitride, and europium sulfide; and (e) a third dopant consisting of between 100 and 1000 parts per million by weight of a cerium compound selected from the group consisting of cerium oxide, cerium halide, cerium nitride, and cerium sulfide; wherein said thermoluminescent material provides electron trapping with trap depths in the range of 0 4 eV and 0.7 eV.
Claim 4
Dependent Claim
153 words
A thermoluminescent material consisting essentially of: (a) a base material consisting of strontium sulfide; (b) a fusible salt comprising lithium fluoride, there being at most 2 parts lithium fluoride for every 10 parts of base material by weight; (c) a first dopant consisting of between 100 and 1000 parts per million by weight of a lanthanum compound selected from the group consisting of lanthanum oxide, lanthanum halide, lanthanum nitride, and lanthanum sulfide; (d) a second dopant consisting of between 100 and 1000 parts per million by weight of a europium oxide, europium halide, europium nitride, and europium sulfide; and (e) a third dopant consisting of between 100 and 1000 parts per million by weight of a cerium compound selected from the group consisting of cerium oxide, cerium halide, cerium nitride, and cerium sulfide; wherein said thermoluminescent material provides electron trapping with trap depths in the range of 0 4 eV and 0.7 eV.
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) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |