US2785137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminescent materials
Assignee: EMI Group Ltd
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Filing: 1952-11-06
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Granted: 1957-03-12
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Expires: 1972-11-06
Abstract
No abstract record available.
Inventors
- 👤 Ranby Peter Whitten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:59
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/74; C09K11/75; C09K11/751
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD OF PREPARING AN ARTIFICIAL LUMINESCENT MATERIAL INCLUDING THE STEP OF HEAT TREATING AT A TEMPERATURE IN THE RANGE OF 700*C. TO 1250*C., AN INITIAL MIXTURE COMPRISING COMPOUNDS OF MAGNESIUM, LITHIUM AND ANTIMONY, SAID COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF THE OXIDES AND COMPOUNDS CONVERTIBLE TO THE OXIDES, OF SAID SUBSTANCES, AND COMPOUND OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF MANGANESE, URANIUM, AND MANGANESE PLUS URANIUM, THE PROPORTIONS BY WEIGHT OF SAID COMPOUND IN THE INITIAL MIXTURE BEING BETWEEN 0.001% AND 10%, THE PROPORTION BY WEIGHT OF MAGNESIUM OXIDE, TAKEN AS MGO BEING BETWEEN 20 AND 60%, OF LITHIUM OXIDE, TAKEN AS LI2O, BEING BETWEEN 5 AND 35%, AND ANTIMONY OXIDE, TAKEN AS SB2O3, BEING BETWEEN 30 AND 70%.
Claim 2
Independent Claim
124 words
A METHOD OF PREPARING AN ARTIFICIAL LUMINESCENT MATERIAL INCLUDING THE STEP OF HEAT TREATING AT A TEMPERATURE IN THE RANGE OF 700*C. TO 1250*C., AN INITIAL MIXTURE COMPRISING COMPOUNDS OF MAGNESIUM, LITHIUM AND ANTIMONY, SAID COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF THE OXIDES AND COMPOUNDS CONVERTIBLE TO THE OXIDES, OF SAID SUBSTANCES, AND COMPOUND OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF MANGANESE, URANIUM, AND MANGANESE PLUS URANIUM, THE PROPORTIONS BY WEIGHT OF SAID COMPOUND IN THE INITIAL MIXTURE BEING BETWEEN 0.001% AND 10%, THE PROPORTION BY WEIGHT OF MAGNESIUM OXIDE, TAKEN AS MGO BEING BETWEEN 20 AND 60%, OF LITHIUM OXIDE, TAKEN AS LI2O, BEING BETWEEN 5 AND 35%, AND ANTIMONY OXIDE, TAKEN AS SB2O3, BEING BETWEEN 30 AND 70%.
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) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |