Patent US2310640A successfully refreshed from Google Patents.
US2310640A
Expired / Lapsed
US
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Production of compounds of the cyanine type
Assignee: Ilford Imaging UK Ltd
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Filing: 1934-05-12
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Granted: 1943-02-09
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Expires: 1954-05-12
Abstract
No abstract record available.
Inventors
- 👤 Kendall John David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:00
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/02; C09B23/04
Claims Analysis
Total Claims: 0
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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) | 1946-02-08 | 1946-08-10 | 1947-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-02-08 | 1950-08-10 | 1951-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-02-08 | 1954-08-10 | 1955-02-09 | $7700.00 | Window Closed / Lapsed |