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Patent US2503776A successfully refreshed from Google Patents.
US2503776A
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US
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Cyanine dyes containing a sulfohydrocarbon radical
Assignee: Eastman Kodak Co
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Filing: 1947-03-21
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Granted: 1950-04-11
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Expires: 1967-03-21
Abstract
No abstract record available.
Inventors
- 👤 Robert H Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:32
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/02; C09B23/06; C09B23/10; C09B23/105
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
THE ANHYDRO CYANINE HYDROXIDES WHICH ARE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
12 words
THE ANHYDRO CYANINE HYDROXIDES WHICH ARE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
US2430558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |