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US2676958A
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Azo-dyestuffs
Assignee: BASF Schweiz AG
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Filing: 1951-03-12
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Granted: 1954-04-27
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Expires: 1971-03-12
Abstract
No abstract record available.
Inventors
- 👤 Hanhart Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:15
CPC Classifications
C; C09; C09B; C09B33/00; C09B33/02; C09B33/153
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
AN AZO DYESTUFF WHICH IN ITS FREE ACID STATE CORRESPOND TO THE FORMULA
Claim 2
Dependent Claim
13 words
AN AZO DYESTUFF WHICH IN ITS FREE ACID STATE CORRESPOND TO 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) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |