Patent US3097090A successfully refreshed from Google Patents.
US3097090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgical process
Assignee: Independence Foundation
•
Filing: 1960-06-23
•
Granted: 1963-07-09
•
Expires: 1980-06-23
Abstract
No abstract record available.
Inventors
- 👤 Olav C Aamot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:11
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
136 words
A PROCESS FOR PARTIAL PRE-REDUCTION OF IRON OXIDECONTAINING MATERIALS IN A ROTARY KILN THAT COMPRISES INTRODUCING INTO SAID KILM SAID OXIXE MATERIAL SUBSTANTIALLY WITHIN THE SIZE RANGE OF MINUS 3 TO PLUS 28 MESH IN ADMIXTURE WITH A FINELY-DIVIDED CARBONACEOUS REDUCTANT, AND SUBSTANTIALLY LARGER PIECES OF ADDITIONAL CARBONACEOUS REDUCTANT OF AT LEAST APPROXIMATELY 1 1/2 INCH SIZE, SAID FIENLY-DIVIDED REDUCTANT BEING PRESENT IN AN AMOUNT SUFFICIENT TO REDUCE SAID METALLIC OXIDES AT LEAST IN PART TO THE METALLIC STATE AND SAID LARGER PIECES OF REDUCTANT BEING PRESENT IN AN AMOUNT SUFFICIENT TO FORM AN EFFECTIVE COVER OVER SAID KILN CHARGE, ESTABLISHING A MOVING BED OF SAID CHARGE AND CARBONACEOUS COVER WITHIN SAID KILN AT AN ELEVATED TEMPERATURE TO EFFECT AT LEAST PARTIAL REDUCTION OF SAID OXIDES, AND DISCHARGING SAID CHARGE AND CARBONACEOUS COVER FROM SAID KILN.
References Cited (Backward Citations)
GB674236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-07-08 | 1967-01-07 | 1967-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-08 | 1971-01-07 | 1971-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-08 | 1975-01-07 | 1975-07-09 | $7700.00 | Window Closed / Lapsed |