Patent US3563750A successfully refreshed from Google Patents.
US3563750A
Expired / Lapsed
US
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Hexaarylbiimidazole hydroxyphthalein compositions
Assignee: EIDP Inc
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Filing: 1967-07-20
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Granted: 1971-02-16
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Expires: 1987-07-20
Abstract
Abstract VISIBLE-LIGHT ACTIVATED PHOTOTROPIC COMPOSITIONS OF A HEXAARYLBINIDAZOLE THAT NORMALLY REQUIRES ULTRAVIOLET LIGHT OF ACTIVATION AND A HYDROXYPHTHALEIN DYE THAT IS A VISIBLE-LIGHT ABSORBIND ENERGY-TRANSFER AGENT, AND OPTIONALLY, AN OXIDIZABLE LEUCO FORM OF DYE, PREFERABLY AN AMINOTRIARYLMETHANE. A METHOD FOR IRRADIATING THE COMPOSTION WITH VISIBLE LIGHT IN THE 400-600 MU RANGE.
Inventors
- 👤 Peter Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:37
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/732; Y; Y10; Y10S; Y10S430/00; Y10S430/163
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |