US3231367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron producing blast furnace operations
Assignee: National Steel Corp
•
Filing: 1961-11-24
•
Granted: 1966-01-25
•
Expires: 1981-11-24
Abstract
No abstract record available.
Inventors
- 👤 Julius H Strassburger
- 👤 Edward J Ostrowski
- 👤 James R Dietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:15
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/001; C21B5/003; C21B5/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2279399A
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US2824792A
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US2938182A
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US2833643A
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GB834043A
Cited
US2980416A
Cited
US2970901A
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US3116143A
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US3110584A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |