Patent US2512845A successfully refreshed from Google Patents.
US2512845A
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Monoazo-dyestuffs
Assignee: BASF Schweiz AG
•
Filing: 1947-06-24
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Granted: 1950-06-27
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Expires: 1967-06-24
Abstract
No abstract record available.
Inventors
- 👤 Widmer Willy
- 👤 Mannhart Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:07
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/14; C09B45/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
A MONOAZO-DYESTUFF CONTANING A SINGLE SULFONIC ACID GROUP, BEING FREE FROM -COOHGROUPS AND CORRESPONDING TO THE GENERAL FORMULA
Claim 2
Dependent Claim
18 words
A MONOAZO-DYESTUFF CONTANING A SINGLE SULFONIC ACID GROUP, BEING FREE FROM -COOHGROUPS AND CORRESPONDING TO THE GENERAL FORMULA
References Cited (Backward Citations)
US1128813A
Cited
GB126460A
Cited
CH115470A
Cited
US1821938A
Cited
US1728998A
Cited
US1918002A
Cited
US2033341A
Cited
US2086854A
Cited
US2090432A
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US2122127A
Cited
US2205481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-26 | 1953-12-26 | 1954-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-26 | 1957-12-26 | 1958-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-26 | 1961-12-26 | 1962-06-27 | $7700.00 | Window Closed / Lapsed |