US2646430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quinoline dyes of the polymethine series and process of preparation
Assignee: Eastman Kodak Co
•
Filing: 1950-04-08
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Granted: 1953-07-21
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Expires: 1970-04-08
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
2026-11-05 05:23
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/14; C09B23/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
A POLYMETHINE DYE SELECTED FROM THE GROUP CONSISTING OF THOSE REPRESENTED BY THE FOLLOWING FOUR GENERAL FORMULAS:
Claim 2
Dependent Claim
17 words
A POLYMETHINE DYE SELECTED FROM THE GROUP CONSISTING OF THOSE REPRESENTED BY THE FOLLOWING FOUR GENERAL FORMULAS:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |