US3567647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphorescent crystals
Assignee: Wyeth Holdings LLC
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Filing: 1968-03-27
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Granted: 1971-03-02
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Expires: 1988-03-27
Abstract
Abstract A PHOSPHORESCENT COMPOSITION COMPRISING MIXED CRYSTALS OF (A) A POLYNUCLEAR CONDENSED RING COMPOUND SUCH AS PYRENE, A HALOPYRENE, BENZ(A)ANTHRACENE, BENZOL(GHI) PERYLENE, CORONENE AND/OR THE CORRESPONDING DEUTERATED COMPOUNDS, AND (B) ANTHRAQUINONE, A HALOGENATED ANTHRAQUINONE AND/OR AN ALKYL ANTHRAQUINONE. THE MIXED CRYSTALS CONTAIN AT LEAST 0.001 MOLE PERCENT OF COMPONENT (A). THE PHOSPHORESCENT COMPOSITIONS CAN BE INCORPORATED IN LIQUID VEHICLES SUCH AS LACQUERS, PAINTS OR PRINTING INKS, AND CAN BE APPLIED TO THE SURFACE OF SOLID ARTICLES SUCH AS PAPER, WOOD, OR METALS TO IMPART PHOSPHORESCENCE THERETO.
Inventors
- 👤 Gerard Ernest Gerhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:32
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/06
Claims Analysis
Total Claims: 0
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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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |