US2600380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymethine dyestuffs
Assignee: Ilford Imaging UK Ltd
•
Filing: 1949-09-22
•
Granted: 1952-06-17
•
Expires: 1969-09-22
Abstract
No abstract record available.
Inventors
- 👤 Edwards Harry Derek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:19
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/0008; C09B23/0033; C09B23/0091
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
PROCESS FOR THE PRODUCTION OF METHINE DYE STUFFS WHICH COMPRISES REACTING A COMPOUND OF THE GENERAL FORMULA;
Claim 2
Dependent Claim
17 words
PROCESS FOR THE PRODUCTION OF METHINE DYE STUFFS WHICH COMPRISES REACTING A COMPOUND OF THE GENERAL FORMULA;
References Cited (Backward Citations)
US2353164A
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US2340882A
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US2342546A
Cited
US2166736A
Cited
US2263749A
Cited
US2322015A
Cited
US2511210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-17 | 1955-12-17 | 1956-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-17 | 1959-12-17 | 1960-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-17 | 1963-12-17 | 1964-06-17 | $7700.00 | Window Closed / Lapsed |