US2426977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disazo dyes from dihydroxy benzidines
Assignee: BASF Schweiz AG
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Filing: 1943-08-16
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Granted: 1947-09-09
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Expires: 1963-08-16
Abstract
No abstract record available.
Inventors
- 👤 Straub Fritz
- 👤 Brassel Jakob
- 👤 Pieth Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:25
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02; C09B35/039; C09B35/08; C09B35/10; C09B35/18; C09B35/16; C09B41/00; C09B41/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190916092A
Cited
US1210751A
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GB102881A
Cited
US1889732A
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GB352956A
Cited
CH163896A
Cited
US2193438A
Cited
US2241796A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-08 | 1951-03-10 | 1951-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-08 | 1955-03-10 | 1955-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-08 | 1959-03-10 | 1959-09-09 | $7700.00 | Window Closed / Lapsed |