US2741658A
Expired / Lapsed
US
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Acid amide derivatives of azo-dyestuffs
Assignee: BASF Schweiz AG
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Filing: 1953-10-19
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Granted: 1956-04-10
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Expires: 1973-10-19
Abstract
No abstract record available.
Inventors
- 👤 Schmid Max
- 👤 Moser Eduard
- 👤 Danuser Jakob
- 👤 Mory Rudolf
- 👤 Mueller Willy
- 👤 Wuergler Jakob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:55
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/32; C09B43/38; D; D06; D06P; D06P1/00; D06P1/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
AN ACID AMIDE DERIVATIVE OF AN AZO DYESTUFF, WHICH DERIVATIVE IS FREE FRO SULFONIC ACID GROUPS AND CORRESPONDS TO THE FORMULA
Claim 2
Dependent Claim
21 words
AN ACID AMIDE DERIVATIVE OF AN AZO DYESTUFF, WHICH DERIVATIVE IS FREE FRO SULFONIC ACID GROUPS AND CORRESPONDS TO THE FORMULA
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |