US3034775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic change-over system for blast stoves for blast furnaces
Assignee: Zimmermann and Jansen GmbH
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Filing: 1959-11-12
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Granted: 1962-05-15
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Expires: 1979-11-12
Abstract
No abstract record available.
Inventors
- 👤 Jansen Hermann
- 👤 Walther Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:57
CPC Classifications
C; C21; C21B; C21B9/00; C21B9/10
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) | 1965-05-14 | 1965-11-13 | 1966-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-14 | 1969-11-13 | 1970-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-14 | 1973-11-13 | 1974-05-15 | $7700.00 | Window Closed / Lapsed |