US2511210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methine dyestuffs
Assignee: Ilford Imaging UK Ltd
•
Filing: 1947-03-19
•
Granted: 1950-06-13
•
Expires: 1967-03-19
Abstract
No abstract record available.
Inventors
- 👤 Kendall John David
- 👤 Edwards Harry Derek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:16
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/0091
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
PROCESS FOR THE PRODUCTION OF DYESTUFFS WHICH COMPRISES CONDENSING A COMPOUND OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
15 words
PROCESS FOR THE PRODUCTION OF DYESTUFFS WHICH COMPRISES CONDENSING A COMPOUND OF THE GENERAL FORMULA:
References Cited (Backward Citations)
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US2028141A
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Cited
US2340882A
Cited
US2342546A
Cited
US2166736A
Cited
US2263749A
Cited
US2322015A
Cited
US2397013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-12 | 1953-12-12 | 1954-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-12 | 1957-12-12 | 1958-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-12 | 1961-12-12 | 1962-06-13 | $7700.00 | Window Closed / Lapsed |