Patent US3658817A successfully refreshed from Google Patents.
US3658817A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4 4'-bis(2-phenyl-5-pyrimidinol)
Assignee: General Electric Co
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Filing: 1970-01-07
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Granted: 1972-04-25
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Expires: 1990-01-07
Abstract
Abstract OXIDATIN OF 2-PHENYL-5-PYRIMIDINOL, ALSO CALLED 2-PHENYL-5-HYDROXPYRMINDINE, WITH LEAD DIOXIDE OR SILVER OXIDE IN A BENZENE SOLUTION CAUSES OXIDATIVE COUPLING THROUGH THE 4-POSITIN TO PRODUCE A DIMER AS A CRYSTALLINE SOLID WHICH UNDER ULTRAVIOLET IRRADIATIN FLUORESCES WITH A VERY BRIGHT YELLOW COLOR EITHER AS A SOLID OR IN SOLUTION. THIS COMPOUND BECAUSE OF ITS SOLUBILITY IN ORDINARY SOLVENTS CAN BE INCORPORATED IN LACQUERS OR POLYMERIC COMPOSTIONS TO IMPART ITS FLUORESCENT PROPERITIES TO THE COMPOSTION.
Inventors
- 👤 Charles M Orlando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:07
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/32; C07D239/34; C07D239/36
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |