US2766534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for treating granular materials with gases
Assignee: Ruhrchemie AG
•
Filing: 1954-02-17
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Granted: 1956-10-16
•
Expires: 1974-02-17
Abstract
No abstract record available.
Inventors
- 👤 Schaub Franz
- 👤 Tramm Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:35
CPC Classifications
F; F26; F26B; F26B17/00; F26B17/12; F26B17/14; F26B17/1433; F26B17/1441; F26B17/1458; B; B01; B01D; B01D46/00; B01D46/30; B01D46/32; B29; B29B; B29B13/00; B29B13/02; B29B13/06; B29B13/065; B29B2013/002
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-16 | 1960-04-16 | 1960-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-16 | 1964-04-16 | 1964-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-16 | 1968-04-16 | 1968-10-16 | $7700.00 | Window Closed / Lapsed |