US2544507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline earth sulfide phosphorescent pigments
Assignee: EIDP Inc
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Filing: 1949-04-29
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Granted: 1951-03-06
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Expires: 1969-04-29
Abstract
No abstract record available.
Inventors
- 👤 Donald W Lyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:23
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/74; C09K11/7407; C09K11/7421
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
28 words
A PHOSPHORESCENT PIGMENT CONSISTING ESSENTIALLY OF AN ALKALINE EARTH METAL SULFIDE ACTIVATED BY 200-300 P. P. M. OF BISMUTH AND 0.5 TO 12 P. P. M. OF SILVER.
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) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |