US2573555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making methine dyestuffs
Assignee: Ilford Imaging UK Ltd
•
Filing: 1949-09-22
•
Granted: 1951-10-30
•
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
2026-11-01 23:22
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/0008; C09B23/0033; C09B23/0091
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
PROCESS FOR THE PRODUCTION OF METHINE DYESTUFFS WHICH COMPRISES REACTING A COMPOUND OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
16 words
PROCESS FOR THE PRODUCTION OF METHINE DYESTUFFS WHICH COMPRISES REACTING A COMPOUND OF THE GENERAL FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |