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Patent US3522936A successfully refreshed from Google Patents.
US3522936A
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Fluidized bed for heat-treating purposes
Assignee: Huettenwerk Oberhausen AG
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Filing: 1968-02-12
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Granted: 1970-08-04
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Expires: 1988-02-12
Abstract
No abstract record available.
Inventors
- 👤 Hans Geipel
- 👤 Eckenhard Forster
- 👤 Wilfried Heinemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:45
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/56; C21D9/573; C21D9/5732; C21D9/567; G; G21; G21C; G21C19/00; G21C19/14; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10S; Y10S118/00; Y10S118/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2971242A
Cited
US2995773A
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US3355159A
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US3390871A
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US3391915A
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US3445100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-03 | 1974-02-02 | 1974-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-03 | 1978-02-02 | 1978-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-03 | 1982-02-02 | 1982-08-04 | $7700.00 | Window Closed / Lapsed |