US1790220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of calcium compounds
Assignee: IG Farbenindustrie AG
•
Filing: 1928-07-03
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Granted: 1931-01-27
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Expires: 1948-07-03
Abstract
No abstract record available.
Inventors
- 👤 Balz Otto
- 👤 Wagner Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:12
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/04; C05B11/08; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/22; C01B25/26; C01B25/30; C01B25/301; C01F; C01F11/00; C01F11/46
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) | 1934-01-26 | 1934-07-28 | 1935-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-01-26 | 1938-07-28 | 1939-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-01-26 | 1942-07-28 | 1943-01-27 | $7700.00 | Window Closed / Lapsed |