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Patent US2559667A successfully refreshed from Google Patents.
US2559667A
Expired / Lapsed
US
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Azo dye intermediates of the anthraquinone series
Assignee: EIDP Inc
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Filing: 1949-06-17
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Granted: 1951-07-10
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Expires: 1969-06-17
Abstract
No abstract record available.
Inventors
- 👤 Herman E Schroeder
- 👤 Deinet Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:55
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/36; C09B1/42; C09B43/00; C09B43/32; C09B43/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
THE COMPOUNDS OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
6 words
THE COMPOUNDS OF THE GENERAL FORMULA:
References Cited (Backward Citations)
FR348018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |