Patent US2557285A successfully refreshed from Google Patents.
US2557285A
Expired / Lapsed
US
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Monoazo dyestuffs
Assignee: Imperial Chemical Industries Ltd
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Filing: 1946-07-09
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Granted: 1951-06-19
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Expires: 1966-07-09
Abstract
No abstract record available.
Inventors
- 👤 Heywood Basil Jason
- 👤 Knight Arthur Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:06
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/34; C09B29/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
13 words
A MONOAZO DYESTUFF WHICH IN ITS ACID FORM IS REPRESENTED BY THE 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) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |