US2834119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contacting of granular materials with gases
Assignee: Ruhrchemie AG
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Filing: 1951-12-12
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Granted: 1958-05-13
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Expires: 1971-12-12
Abstract
No abstract record available.
Inventors
- 👤 Schaub Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:39
CPC Classifications
F; F28; F28C; F28C3/00; F28C3/10; F28C3/12; B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/44; F23; F23J; F23J15/00; F23J15/02; F23J15/022; F23J15/025; F23J2217/00; F23J2217/10; F23J2217/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
BE498587A
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BE501224A
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GB110235A
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US1836301A
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GB360547A
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US1895601A
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US2202258A
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US2444128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |