US2603642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methine dyestuffs
Assignee: Ilford Imaging UK Ltd
•
Filing: 1950-08-28
•
Granted: 1952-07-15
•
Expires: 1970-08-28
Abstract
No abstract record available.
Inventors
- 👤 Edwards Harry Derek
- 👤 Kendall John David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:13
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/0091
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
PROCESS FOR THE PRODUCTIONOF DYESTUFFS WHICH COMPRISES REACTING A BB-DICYANO KETENE DIALKYL MERCAPTOLE OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
17 words
PROCESS FOR THE PRODUCTIONOF DYESTUFFS WHICH COMPRISES REACTING A BB-DICYANO KETENE DIALKYL MERCAPTOLE OF THE GENERAL FORMULA:
References Cited (Backward Citations)
US2353164A
Cited
US2340882A
Cited
US2166736A
Cited
US2263749A
Cited
US2322015A
Cited
US2338782A
Cited
US2320654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-15 | 1956-01-14 | 1956-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-15 | 1960-01-14 | 1960-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-15 | 1964-01-14 | 1964-07-15 | $7700.00 | Window Closed / Lapsed |