Patent US2856404A successfully refreshed from Google Patents.
US2856404A
Expired / Lapsed
US
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Merocyanine dyes and intermediates
Assignee: Eastman Kodak Co
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Filing: 1956-06-20
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Granted: 1958-10-14
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Expires: 1976-06-20
Abstract
No abstract record available.
Inventors
- 👤 Leslie G S Brooker
- 👤 Donald W Heseltine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:05
CPC Classifications
C; C07; C07D; C07D413/00; C07D413/02; C07D413/10; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/18; C07D231/20; C07D231/22; C07D231/26; C07D239/00; C07D239/02; C07D239/24; C07D239/28; C07D239/46; C07D239/60; C07D261/00; C07D261/02; C07D261/06; C07D261/10; C07D261/12; C07D277/00; C07D277/02; C07D277/20; C07D277/32; C07D277/36; C07D417/00; C07D417/02; C07D417/04; C07D417/10; C07D417/14; C07D421/00; C07D421/02; C07D421/10; C09; C09B; C09B23/00; C09B23/0066; C09B23/10; C09B23/102
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
A PROCESS FOR MAKING POLYMETHINE DYES COMPRISING CONDENSING IN THE PRESENCE OF A BASIC CONDENSING AGENT AN INTERMEDIATE SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
27 words
A PROCESS FOR MAKING POLYMETHINE DYES COMPRISING CONDENSING IN THE PRESENCE OF A BASIC CONDENSING AGENT AN INTERMEDIATE SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |