Patent US2843522A successfully refreshed from Google Patents.
Patent US3782945A successfully refreshed from Google Patents.
US3782945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercaptotetrazaindene in photographic printing plate development
Assignee: Fujifilm Holdings Corp
•
Filing: 1971-06-11
•
Granted: 1974-01-01
•
Expires: 1991-06-11
Abstract
Abstract A PROCESS FOR DEVELOPING A SILVER HALIDE PHOTOGRAPHIC ELEMENT WHICH COMPRISES DEVELOPING A LITHOGRAPHIC LIGHTSENSITIVE MATERIAL IN THE PRESENCE OF THE COMPOUND REPRESENTED BY THE FOLLOWING GENERAL FORMULA, 2-R1,5-R4,6-R3,7-R2-2H-IMIDAZO(4,5-B)PYRIDINE WHEREIN R1 AND R2 WHICH MAY BE THE SAME OF DIFFERENT, REPRESENT A HYDROGEN ATOM, A HYDROXYL GROUP, AHYDROCARBON GROUP OR -SR5; AT LEAST ONE OF SAID R1 AND R2 BEING -SR5; R5 REPRESENT A HYDROGEN ATOM OR ALKYL RADICAL; AND R3 AND R4, WHICH MAY BE THE SAME OR DIFFERENT, REPRESENT A HYDROGEN ATOM, A HYDROXYL GROUP A HALOGEN ATOM, OR A HYDROCARBON GROUP; SAID R3 AND R4 MAY BE RING-CLOSED TO FORM A 5- OR 6 MEMBERED RING.
Inventors
- 👤 T Shishido
- 👤 R Ohi
- 👤 E Okutsu
- 👤 H Iwano
- 👤 I Shimamura
- 👤 Y Iijima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:27
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34; G03C1/346
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |