Patent US1893946A successfully refreshed from Google Patents.
US1893946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of calcium nitrate
Assignee: Individual
•
Filing: 1932-01-09
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Granted: 1933-01-10
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Expires: 1952-01-09
Abstract
No abstract record available.
Inventors
- 👤 Kaselitz Oscar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:49
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/38; C01B21/46; C01F; C01F11/00; C01F11/36; C01F11/38; C05; C05C; C05C5/00; C05C5/04
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) | 1936-01-10 | 1936-07-11 | 1937-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-01-10 | 1940-07-11 | 1941-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-01-10 | 1944-07-11 | 1945-01-10 | $7700.00 | Window Closed / Lapsed |