US3521871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lance for blowing gases into contact with molten metal
Assignee: Der Eisenhuttentechnik Mbh Gesell zur Forderung
•
Filing: 1966-12-29
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Granted: 1970-07-28
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Expires: 1986-12-29
Abstract
No abstract record available.
Inventors
- 👤 Rudolf Wurzbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:08
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4606; C21C5/462
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
AT81700B
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US1146394A
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FR808111A
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US2829960A
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US3045997A
Cited
US3241825A
Cited
US3292662A
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US3321139A
Cited
US3379428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |