US2541400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N, n'-alkylenecyanine dyes
Assignee: Eastman Kodak Co
•
Filing: 1949-02-17
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Granted: 1951-02-13
•
Expires: 1969-02-17
Abstract
No abstract record available.
Inventors
- 👤 Leslie G S Brooker
- 👤 Robert H Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:46
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/02; C09B23/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
9 words
THE ASYMMETRICAL N,N''-ALKYLENECYANINE DYES OF THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
US2478367A
Cited
US2479152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |