US3479022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for vacuum treating liquid steel according to the circulation method
Assignee: STANDARD MESSO DUISBURG
•
Filing: 1966-06-27
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Granted: 1969-11-18
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Expires: 1986-06-27
Abstract
No abstract record available.
Inventors
- 👤 Werner Coupette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:26
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/143
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |