US2049359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying silicic acid
Assignee: General Electric Co
•
Filing: 1933-10-25
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Granted: 1936-07-28
•
Expires: 1953-10-25
Abstract
No abstract record available.
Inventors
- 👤 Dusing Werner
- 👤 Ensz Johann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:21
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193; C03; C03C; C03C1/00; C03C1/02; C03C1/022; C01P; C01P2002/00; C01P2002/80; C01P2002/84; C01P2006/00; C01P2006/80; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/905
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) | 1939-07-28 | 1940-01-27 | 1940-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-07-28 | 1944-01-27 | 1944-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-07-28 | 1948-01-27 | 1948-07-28 | $7700.00 | Window Closed / Lapsed |