US1880901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of maleic acid and its anhydride
Assignee: IG Farbenindustrie AG
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Filing: 1931-09-12
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Granted: 1932-10-04
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Expires: 1951-09-12
Abstract
No abstract record available.
Inventors
- 👤 Drossbach Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:15
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/23
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) | 1935-10-04 | 1936-04-04 | 1936-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-10-04 | 1940-04-04 | 1940-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-10-04 | 1944-04-04 | 1944-10-04 | $7700.00 | Window Closed / Lapsed |