US1832853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for denitrating acid mixtures and concentrating acid mixtures
Assignee: Hercules Powder Co
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Filing: 1928-10-26
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Granted: 1931-11-24
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Expires: 1948-10-26
Abstract
No abstract record available.
Inventors
- 👤 James L Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:49
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/38; C01B21/46
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) | 1934-11-23 | 1935-05-25 | 1935-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-11-23 | 1939-05-25 | 1939-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-11-23 | 1943-05-25 | 1943-11-24 | $7700.00 | Window Closed / Lapsed |