Patent US2493748A successfully refreshed from Google Patents.
US2493748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Merocyanine dyes
Assignee: Eastman Kodak Co
•
Filing: 1945-07-16
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Granted: 1950-01-10
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Expires: 1965-07-16
Abstract
No abstract record available.
Inventors
- 👤 Leslie G S Brooker
- 👤 Grafton H Keyes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:30
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/0075; C09B23/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
THE MEROCYANINE DYES REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
9 words
THE MEROCYANINE DYES REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
US2108485A
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US2089729A
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US2078233A
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US2108845A
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US2274782A
Cited
US2231658A
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US2170807A
Cited
US2265908A
Cited
US2338782A
Cited
US2263018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |