Patent US2952851A successfully refreshed from Google Patents.
Patent US1913794A successfully refreshed from Google Patents.
US1913794A
Expired / Lapsed
US
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Process of preparing ethionic acid or carbyl sulphate
Assignee: IG Farbenindustrie AG
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Filing: 1931-05-11
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Granted: 1933-06-13
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Expires: 1951-05-11
Abstract
No abstract record available.
Inventors
- 👤 Daimler Karl
- 👤 Platz Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:52
CPC Classifications
C; C07; C07D; C07D327/00; C07C; C07C303/00; C07C303/02; C07C303/04; C07C303/06; C07C303/24
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) | 1936-06-12 | 1936-12-12 | 1937-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-06-12 | 1940-12-12 | 1941-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-06-12 | 1944-12-12 | 1945-06-13 | $7700.00 | Window Closed / Lapsed |