Patent US3704088A successfully refreshed from Google Patents.
US3704088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of restricting oxidation of sponge iron
Assignee: Steel Company of Canada Ltd
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Filing: 1970-05-22
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Granted: 1972-11-28
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Expires: 1990-05-22
Abstract
Abstract A SYSTEM FOR REDUCING THE OXIDATION OF AGGLORMERATED SPONGE IRON DURING STORAGE OR TRANSIT WHEREIN THE MASS OF IRON IS STORED IN AN ENCLOSURE HAVING A GAS-PERMEABLE BOTTOM AND AIR, NITROGEN-ENRICHED AIR OR NITROGEN TREATED TO REMOVE MOISTURE AND ACIDIC CONSTITUENTS, IS PASSED THROUGH THE MASS AT A PREDETERMINED RATE. D R A W I N G
Inventors
- 👤 Horst Nagel
- 👤 Wilhelm Thumm
- 👤 Horst Garbe
- 👤 William H Dailey
- 👤 Egon Goedeke
- 👤 Rolf Dadazynski
- 👤 Bergen Enkheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:44
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0086; F; F16; F16B; F16B2/00; F16B2/02; F16B2/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |