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Patent US1804527A successfully refreshed from Google Patents.
US1804527A
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US
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Aromatic sulfonic acids and process of preparing the same
Assignee: IG Farbenindustrie AG
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Filing: 1926-05-27
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Granted: 1931-05-12
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Expires: 1946-05-27
Abstract
No abstract record available.
Inventors
- 👤 Dachlauer Karl
- 👤 Thiel Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:23
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/28; C07C309/33; C07C309/34; C07C309/35; C07C309/36
Claims Analysis
Total Claims: 0
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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) | 1934-05-11 | 1934-11-10 | 1935-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-05-11 | 1938-11-10 | 1939-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-05-11 | 1942-11-10 | 1943-05-12 | $7700.00 | Window Closed / Lapsed |