US2704755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polynuclear cyanine dyes
Assignee: Ilford Imaging UK Ltd
•
Filing: 1954-02-08
•
Granted: 1955-03-22
•
Expires: 1974-02-08
Abstract
No abstract record available.
Inventors
- 👤 Kendall John David
- 👤 Duffin George Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:51
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/26; C; C09; C09B; C09B23/00; C09B23/0075
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
CYANINE DYES SELECTED FROM THE CLASS CONSISTING OF SALTS OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
13 words
CYANINE DYES SELECTED FROM THE CLASS CONSISTING OF SALTS OF THE GENERAL FORMULA:
References Cited (Backward Citations)
US2353164A
Cited
US2340882A
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US2166736A
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US2263749A
Cited
US2322015A
Cited
US2338782A
Cited
US2320654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-21 | 1958-09-20 | 1959-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-21 | 1962-09-20 | 1963-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-21 | 1966-09-20 | 1967-03-22 | $7700.00 | Window Closed / Lapsed |