Patent US2564243A successfully refreshed from Google Patents.
US2564243A
Expired / Lapsed
US
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Azo dyestuffs
Assignee: Imperial Chemical Industries Ltd
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Filing: 1947-12-29
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Granted: 1951-08-14
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Expires: 1967-12-29
Abstract
No abstract record available.
Inventors
- 👤 Beech Walter Francis
- 👤 Mendoza Mordecai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:01
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/14; C09B45/16; C09B45/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
MONOAZO DYESTUFFS OF CLEAR GREEN SHADE WHEN CHROMED AND HAVING A HIGH METACHROME DYEING EFFICIENCY AND LIGHT-FASTNESS OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
21 words
MONOAZO DYESTUFFS OF CLEAR GREEN SHADE WHEN CHROMED AND HAVING A HIGH METACHROME DYEING EFFICIENCY AND LIGHT-FASTNESS 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) | 1954-08-13 | 1955-02-12 | 1955-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-13 | 1959-02-12 | 1959-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-13 | 1963-02-12 | 1963-08-14 | $7700.00 | Window Closed / Lapsed |