US2689849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyanine dyes containing the triazolo[4, 3-alpha] quinoline or tetrazolo[alpha] quinoline nucleus
Assignee: Eastman Kodak Co
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Filing: 1952-09-10
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Granted: 1954-09-21
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Expires: 1972-09-10
Abstract
No abstract record available.
Inventors
- 👤 Leslie G S Brooker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:11
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/14; C09B23/145; C09B23/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A CYANINE DYE SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
12 words
A CYANINE DYE SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
US2443136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |