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Patent US3673102A successfully refreshed from Google Patents.
US3673102A
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Cathodoluminescent calcium sulfide compositions with improved fast decay characteristic
Assignee: Westinghouse Electric Corp
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Filing: 1970-09-29
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Granted: 1972-06-27
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Expires: 1990-09-29
Abstract
Abstract The selected calcium sulfide cathodoluminescent materials which exhibit an inherent rapid decay characteristic after cathodoluminescent excitation exhibit an even faster decay characteristic when a predetermined amount of cobalt is incorporated into the composition. The amount of cobalt is preferably from about 0.001 gram-atom percent to one gram-atom percent taken with respect to the moles of calcium sulfide, with the energy efficiency of luminescence and the length of the time of phosphorescence decreasing with increasing cobalt content.
Inventors
- 👤 Willi Lehmann
- 👤 Frederick M Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:56
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/0805; C09K11/0816
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
47 words
The composition as specified in claim 1, wherein the amount of cobalt is preferably from about 0.001 gram-atom percent to 1 gram-atom percent based on the moles of calcium sulfide, with the energy efficiency of luminescence and the length of time of phosphorescence decreasing with increasing cobalt.
Claim 2
Dependent Claim
58 words
The composition as specified in claim 1, wherein said composition is activated by cerium and/or divalent europium in the amount of 10 5 to 10 2 mole of the sulfide, and coactivated with chlorine, bromine, iodine, fluorine, or phosphorus in amount such that the atom ratio of coactivator to cerium and/or europium is from about 1:1 to 10:1.
Claim 3
Dependent Claim
48 words
The composition as specified in claim 3, wherein the amount of cobalt is preferably from about 0.001 gram-atom percent to 1 gram-atom percent taken with respect to moles of calcium sulfide, with the energy efficiency of luminescence and the length of time of phosphorescence decreasing with increasing cobalt.
Claim 4
Dependent Claim
60 words
The composition as specified in claim 1, wherein said composition is activated by lead in an amount of 10 5 to 10 3 gram-atom based on the moles of sulfide, and coactivated with chlorine, bromine, fluorine, and/or iodine in an atom amount at least equal to the lead content and up to about ten times greater than the lead content.
Claim 5
Dependent Claim
48 words
The composition as specified in claim 5, wherein the amount of cobalt is preferably from about 0.001 gram-atom percent to 1 gram-atom percent taken with respect to moles of calcium sulfide, with the energy efficiency of luminescence and the length of time of phosphorescence decreasing with increasing cobalt.
Claim 6
Dependent Claim
51 words
The composition as specified in claim 1, wherein said composition is activated by bismuth in an amount of 10 5 to 10 3 and coactivated with sodium in an atom amount of at least equal to the amount of bismuth and up to about 10 times greater than the bismuth content.
Claim 7
Dependent Claim
48 words
The composition as specified in claim 7, wherein the amount of cobalt is preferably from about 0.001 gram-atom percent to 1 gram-atom percent taken with respect to moles of calcium sulfide, with the energy efficiency of luminescence and the length of time of phosphorescence decreasing with increasing cobalt.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |