US1782747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of splitting off sulphogroups from anthraquinone sulphonic acid derivatives
Assignee: General Aniline Works Inc
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Filing: 1926-04-13
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Granted: 1930-11-25
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Expires: 1946-04-13
Abstract
No abstract record available.
Inventors
- 👤 Schmidt Robert Emanuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:13
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/02; C09B1/06; C07; C07C; C07C225/00; C07C225/24; C07C225/26; C07C225/32; C07C225/34; C09B1/50; C09B1/52
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) | 1933-11-24 | 1934-05-26 | 1934-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-11-24 | 1938-05-26 | 1938-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-11-24 | 1942-05-26 | 1942-11-25 | $7700.00 | Window Closed / Lapsed |