US3560216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light sensitive free radical imaging material containing pyrazoline sensitizers
Assignee: Keuffel and Esser Co
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Filing: 1967-12-15
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Granted: 1971-02-02
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Expires: 1987-12-15
Abstract
Abstract LIGHT-SENSITIVE IMAGING MATERIALS COMPRISING COLOR MODIFIERS WHICH VISIBLY CHANGE IN COLOR OR SHADE IN THE PRESENCE OF FREE RADICALS IN COMBINATION WITH PHOTOACTIVATORS WHICH YIELD FREE RADICALS UPON EXPOSURE TO ACTINIC LIGHT ARE SUBSTANTIALLY INCREASED IN LIGHT-SENSITIVITY BY THE ADDITION OF AN ARYL-SUBSTITUTED PYRAZOLINE COMPOUND. SUCH SENSITIZERS ARE PARTICULARLY EFFECTIVE IN INCREASING THE RATE OF IMAGE-FORMING REACTION WITH RESPECT TO NORMAL SPECTRAL RANGES RATHER THAN IN BROADENING THE BAND OF SPECTRAL RESPONSE OF SUCH MATERIALS.
Inventors
- 👤 Haruo Hori
- 👤 Masahiko Taguchi
- 👤 Shoichiro Hoshino
- 👤 Akira Kato
- 👤 Keiichi Yumiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:53
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/732; G03C1/675
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |