Patent US2731464A successfully refreshed from Google Patents.
US2731464A
Expired / Lapsed
US
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Production of vat dyestuffs
Assignee: BASF SE
•
Filing: 1952-09-04
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Granted: 1956-01-17
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Expires: 1972-09-04
Abstract
No abstract record available.
Inventors
- 👤 Ebel Friedrich
- 👤 Rupp Walter
- 👤 Keller Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:59
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE COMPOUNDS HAVING THE FOLLOWING STRUCTURAL FORMULAS:
Claim 2
Dependent Claim
15 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE COMPOUNDS HAVING THE FOLLOWING STRUCTURAL FORMULAS:
References Cited (Backward Citations)
US2299141A
Cited
US2567821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |