US2965579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing ultra-violet luminescing silicates
Assignee: US Philips Corp
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Filing: 1956-05-08
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Granted: 1960-12-20
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Expires: 1976-05-08
Abstract
No abstract record available.
Inventors
- 👤 Cox Anna Petronella Maria
- 👤 Hoekstra Age Hylke
- 👤 Klasens Hendrik Anne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:07
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/66; C09K11/666
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
60 words
A METHOD OF PRODUCING A LUMINESCENT LEAD-ACTIVATED SILICATE WHICH EXHIBITS A MAXIMUM EMISSION OF ULTRAVIOLET RADIATION BETWEEN 2800 A. AND 3500 A. COMPRISING FORMING A MIXTURE OF COMPOUNDS OF CALCIUM, MAGNESIUM, SILICON AND LEAD SELECTED FROM THE GROUP CONSISTING OF OXIDES, NITRATES AND CARBONATES IN WHICH THE ATOMIC RATIOS OF THE ELEMENTS IN THE MIXTURE FALL WITHIN THE FOLLOWING RANGE:
Claim 2
Independent Claim
60 words
A METHOD OF PRODUCING A LUMINESCENT LEAD-ACTIVATED SILICATE WHICH EXHIBITS A MAXIMUM EMISSION OF ULTRAVIOLET RADIATION BETWEEN 2800 A. AND 3500 A. COMPRISING FORMING A MIXTURE OF COMPOUNDS OF CALCIUM, MAGNESIUM, SILICON AND LEAD SELECTED FROM THE GROUP CONSISTING OF OXIDES, NITRATES AND CARBONATES IN WHICH THE ATOMIC RATIOS OF THE ELEMENTS IN THE MIXTURE FALL WITHIN THE FOLLOWING RANGE:
Claim 3
Dependent Claim
12 words
AN ULTRA-VIOLET LUMINESCENT, LEAD-ACTIVATED SILICATE PRODUCED BY THE METHOD OF CLAIM 1.
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) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |