Patent US1939162A successfully refreshed from Google Patents.
US1939162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing concentrated nitric acid
Assignee: ALBERT R FRANK DR
•
Filing: 1930-01-11
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Granted: 1933-12-12
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Expires: 1950-01-11
Abstract
No abstract record available.
Inventors
- 👤 Caro Nikodem
- 👤 Frank Albert Rudolph
- 👤 Siebert Werner
- 👤 Fischer Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:43
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26; C01B21/38; C01B21/46; F; F16; F16L; F16L37/00; F16L37/08; F16L37/084
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) | 1936-12-11 | 1937-06-12 | 1937-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-12-11 | 1941-06-12 | 1941-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-12-11 | 1945-06-12 | 1945-12-12 | $7700.00 | Window Closed / Lapsed |