Patent US3539223A successfully refreshed from Google Patents.
US3539223A
Expired / Lapsed
US
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System for the introduction of powdery material into an enclosure containing a gas
Assignee: CREUSOT FORGES ATELIERS
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Filing: 1968-09-16
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Granted: 1970-11-10
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Expires: 1988-09-16
Abstract
No abstract record available.
Inventors
- 👤 Rene Bovagne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:47
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/0015; B01J8/0025; F; F27; F27B; F27B7/00; F27B7/20; F27B7/2016; F27B7/2025; F27D; F27D3/00; F27D3/0033
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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |