Patent US4368018A successfully refreshed from Google Patents.
Patent US2664401A successfully refreshed from Google Patents.
US2664401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline earth phosphate phosphors of the apatite type
Assignee: General Electric Co
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Filing: 1949-04-01
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Granted: 1953-12-29
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Expires: 1969-04-01
Abstract
No abstract record available.
Inventors
- 👤 Mckeag Alfred Hamilton
- 👤 Ranby Peter Whitten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:05
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/0855; C09K11/0861
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
22 words
A LUMINESCENT COMPOSITION HAVING A MATRIX OF APATITE TYPE CRYSTALLINE STRUCTURE OF THE GROUP CONSISTING OF 3M3 (PO4) 2.M (OH) 2 AND
Claim 2
Dependent Claim
22 words
A LUMINESCENT COMPOSITION HAVING A MATRIX OF APATITE TYPE CRYSTALLINE STRUCTURE OF THE GROUP CONSISTING OF 3M3 (PO4) 2.M (OH) 2 AND
Claim 3
Independent Claim
149 words
THE METHOD OF MANUFACTURING A LUMINESCENT MATERIAL WHICH COMPRISES THE STEP OF HEATING TO A TEMPERATURE IN THE RANGE OF ABOUT 900-1200* C., IN AN ATMOSPHERE COMPRISING STEAM, A MIXTURE OF AN ACTIVATOR OF THE GROUP CONSISTING OF ONE OF THE METALS COPPER, ANTIMONY, TIN AND THALLIUM AND MIXTURES OF ONE OF SAID METALS WITH MANGANESE IN PROPORTIONS BY WEIGHT OF THE COMPOSITION OF ABOUT 0.1% COPPER, 1-3% ANTIMONY, 2-10% TIN, 1% THALLIUM AND 1-5% MANGANESE, TOGETHER WITH MATERIAL SELECTED FROM THE GROUP CONSISTING OF AN ALKALINE EARTH HALOPHOSPHATE COMPOUND HAVING THE APATITE TYPE OF CRYSTAL STRUCTURE AND STARTING MATERIALS CONSISTING ONLY OF A SALT OF AN ALKALINE EARTH METAL AND A PHOSPHATE COMPOUND OTHER THAN A HALOPHOSPHATE, IN PROPORTIONS TO PRODUCE, DURING THE HEATING, A COMPOUND OF THE GROUP CONSISTING OF ALKALINE EARTH HYDROXY-PHOSPHATES AND OXY-PHOSPHATES HAVING THE APATITE TYPE OF CRYSTAL STRUCTURE AND CORRESPONDING TO THE FORMULAE
Claim 4
Independent Claim
149 words
THE METHOD OF MANUFACTURING A LUMINESCENT MATERIAL WHICH COMPRISES THE STEP OF HEATING TO A TEMPERATURE IN THE RANGE OF ABOUT 900-1200* C., IN AN ATMOSPHERE COMPRISING STEAM, A MIXTURE OF AN ACTIVATOR OF THE GROUP CONSISTING OF ONE OF THE METALS COPPER, ANTIMONY, TIN AND THALLIUM AND MIXTURES OF ONE OF SAID METALS WITH MANGANESE IN PROPORTIONS BY WEIGHT OF THE COMPOSITION OF ABOUT 0.1% COPPER, 1-3% ANTIMONY, 2-10% TIN, 1% THALLIUM AND 1-5% MANGANESE, TOGETHER WITH MATERIAL SELECTED FROM THE GROUP CONSISTING OF AN ALKALINE EARTH HALOPHOSPHATE COMPOUND HAVING THE APATITE TYPE OF CRYSTAL STRUCTURE AND STARTING MATERIALS CONSISTING ONLY OF A SALT OF AN ALKALINE EARTH METAL AND A PHOSPHATE COMPOUND OTHER THAN A HALOPHOSPHATE, IN PROPORTIONS TO PRODUCE, DURING THE HEATING, A COMPOUND OF THE GROUP CONSISTING OF ALKALINE EARTH HYDROXY-PHOSPHATES AND OXY-PHOSPHATES HAVING THE APATITE TYPE OF CRYSTAL STRUCTURE AND CORRESPONDING TO THE FORMULAE
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |