US2920046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminescent materials
Assignee: EMI Group Ltd
•
Filing: 1953-07-22
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Granted: 1960-01-05
•
Expires: 1973-07-22
Abstract
No abstract record available.
Inventors
- 👤 Ranby Peter Whitten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:28
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/0877
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
AN ARTIFICIAL LUMINESCENT MATERIAL IN THE FORM OF A SOFT POWDER AND COMPRISING THE BORATE OF AT LEAST ONE OF THE METALS SELECTED FROM THE GROUP CONSISTING OF CALCIUM, STROTIUM, BARIUM AND CADMIUM, SAID BORATE BEING ACTIVATED BY 0.001 GRAM ATOM TO 0.1 GRAM ATOM OF MANGANESE AND BETWEEN ABOUT 0.005 TO 0.7 GRAM ATOM OF BISMUTH, AND IN WHICH THE RATIO OF METAL OXIDE, EXCLUSIVE OF THE ACTIVATOR, TO BORIC ACID LIES BETWEEN 1/2 AND 1/7.
Claim 2
Dependent Claim
77 words
AN ARTIFICIAL LUMINESCENT MATERIAL IN THE FORM OF A SOFT POWDER AND COMPRISING THE BORATE OF AT LEAST ONE OF THE METALS SELECTED FROM THE GROUP CONSISTING OF CALCIUM, STROTIUM, BARIUM AND CADMIUM, SAID BORATE BEING ACTIVATED BY 0.001 GRAM ATOM TO 0.1 GRAM ATOM OF MANGANESE AND BETWEEN ABOUT 0.005 TO 0.7 GRAM ATOM OF BISMUTH, AND IN WHICH THE RATIO OF METAL OXIDE, EXCLUSIVE OF THE ACTIVATOR, TO BORIC ACID LIES BETWEEN 1/2 AND 1/7.
References Cited (Backward Citations)
US2241950A
Cited
US2270124A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |