Patent US2820704A successfully refreshed from Google Patents.
US2820704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving characteristics of iron oxide agglomerates
Assignee: United States Steel Corp
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Filing: 1956-01-06
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Granted: 1958-01-21
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Expires: 1976-01-06
Abstract
No abstract record available.
Inventors
- 👤 Walter C Allen
- 👤 Thomas F Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:05
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
A METHOD OF IMPROVING THE MECHANICAL STRENGTH OF PARTIALLY FUSED IRON OXIDE AGGIOMERATES FORMED AT ABOUT 2400 TO 2600*F COMPRISING COOLING THESE AGGLOMERATES FROM AN INITIAL TEMPERATURE APPROXIMATING THAT AT WHICH
Claim 2
Independent Claim
31 words
A METHOD OF IMPROVING THE MECHANICAL STRENGTH OF PARTIALLY FUSED IRON OXIDE AGGIOMERATES FORMED AT ABOUT 2400 TO 2600*F COMPRISING COOLING THESE AGGLOMERATES FROM AN INITIAL TEMPERATURE APPROXIMATING THAT AT WHICH
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US2608481A
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US2676095A
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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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |