US2783884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for the contacting of granular materials with liquids and gases
Assignee: Ruhrchemie AG
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Filing: 1951-12-04
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Granted: 1957-03-05
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Expires: 1971-12-04
Abstract
No abstract record available.
Inventors
- 👤 Schaub Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:08
CPC Classifications
C; C11; C11B; C11B1/00; C11B1/10; B; B03; B03D; B03D1/00; B03D1/14; B03D1/1412; B03D1/1443; B03D1/1468; B03D1/24; B03D1/245
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) | 1960-03-04 | 1960-09-03 | 1961-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-04 | 1964-09-03 | 1965-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-04 | 1968-09-03 | 1969-03-05 | $7700.00 | Window Closed / Lapsed |