US2862807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Updraft pelletizing method
Assignee: Cleveland Cliffs Iron Co
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Filing: 1957-05-02
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Granted: 1958-12-02
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Expires: 1977-05-02
Abstract
No abstract record available.
Inventors
- 👤 Louis J Erck
- 👤 Donald C Violetta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:39
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/26; C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/2413
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
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
Claim 2
Independent Claim
183 words
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
References Cited (Backward Citations)
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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) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |