US2697707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing cyanine dyestuffs
Assignee: Ilford Imaging UK Ltd
•
Filing: 1951-11-26
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Granted: 1954-12-21
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Expires: 1971-11-26
Abstract
No abstract record available.
Inventors
- 👤 Kendall John David
- 👤 Suggate Harold Gordon
- 👤 Mayo John Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:09
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/22; C; C09; C09B; C09B23/00; C09B23/0091; C09B23/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2511210A
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US2603642A
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US2573555A
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US2600380A
Cited
US2638473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |