US2176441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of gaseous weak acid from gases containing the same
Assignee: IG Farbenindustrie AG
•
Filing: 1936-03-31
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Granted: 1939-10-17
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Expires: 1956-03-31
Abstract
No abstract record available.
Inventors
- 👤 Ulrich Heinrich
- 👤 Fick Reinhold
- 👤 Baehr Hans
- 👤 Wenzel Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:25
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/52; B01D53/526
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) | 1942-10-16 | 1943-04-17 | 1943-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-10-16 | 1947-04-17 | 1947-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-10-16 | 1951-04-17 | 1951-10-17 | $7700.00 | Window Closed / Lapsed |