US1479852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating and purifying gases containing hydrogen sulphide
Assignee: Bayer AG
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Filing: 1921-08-08
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Granted: 1924-01-08
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Expires: 1941-08-08
Abstract
No abstract record available.
Inventors
- 👤 Engelhardt Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:00
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/046; C01B17/0469
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) | 1927-01-07 | 1927-07-09 | 1928-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-01-07 | 1931-07-09 | 1932-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-01-07 | 1935-07-09 | 1936-01-08 | $7700.00 | Window Closed / Lapsed |