Patent US2235193A successfully refreshed from Google Patents.
Patent US3328419A successfully refreshed from Google Patents.
US3328419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colour couplers and their production and use in colour photography
Assignee: Ilford Imaging UK Ltd
•
Filing: 1964-06-15
•
Granted: 1967-06-27
•
Expires: 1984-06-15
Abstract
No abstract record available.
Inventors
- 👤 Anderson Brian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:53
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/3212; C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/44; C07D231/52; C07D307/00; C07D307/77; C07D307/87; C07D307/89
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
17 words
A COLOR COUPLER WHICH IS A COMPOUND SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULA:
Claim 2
Dependent Claim
17 words
A COLOR COUPLER WHICH IS A COMPOUND SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULA:
Claim 3
Dependent Claim
10 words
A COMPOUND ACCORDING TO CHAIN 1 WHEREIN B REPRESENTS 1-PHENYL-5-PYRAZOLONYL-1.
Claim 4
Dependent Claim
10 words
A COMPOUND ACCORDING TO CHAIN 1 WHEREIN B REPRESENTS 1-PHENYL-5-PYRAZOLONYL-1.
References Cited (Backward Citations)
US2905694A
Cited
US2083216A
Cited
US2710803A
Cited
US2837557A
Cited
US2933391A
Cited
US2878263A
Cited
US3034891A
Cited
US2983608A
Cited
US3148178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |