US3353951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluffy iron powder and process for preparing same
Assignee: Akzo Nobel Paints LLC
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Filing: 1966-05-09
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Granted: 1967-11-21
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Expires: 1986-05-09
Abstract
No abstract record available.
Inventors
- 👤 William M Shafer
- 👤 Jr George Yurasko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:21
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; C; C21; C21B; C21B13/00; C21B13/008; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12479
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A PROCESS FOR PRODUCING IRON POWDER WHICH COMPRISES THE STEPS OF: (A) FORMING A UNIFORMLY BLENDED POWDERED MIXTURE COMPRISING: (1) FINELY DIVIDED IRON OXIDE HAVING AN OXYGEN CONTENT BETWEEN ABOUT 6 AND 30 WEIGHT PERCENT, BASIS THE WEIGHT OF THE IRON OXIDE, AND CONTAINING LESS THAN ABOUT ONE WEIGHT PERCENT OF ACID INSOLUBLES; (2) FINELY DIVIDED, SOLID, CARVONACEOUS MATERIAL, IN AN AMOUNT SUFFICIENT TO PROVIDE AN IRON OXIDE OXYGEN TO FREE CARBON ATOMIC RATIO IN SAID MIXTURE OF FROM ABOUT 1.5:1 TO ABOUT 3:1; AND (3) OPTIONALLY UP TO ABOUT 3 WEIGHT PERCENT, BASIS THE WEIGHT OF THE IRON OXIDE, OF A FINELY DIVIDED METAL CARBONATE SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METAL CARBONATES; (B) CONTACTING SAID MIXTURE IN A REDUCTION ZONE, AT A TEMPERATURE BETWEEN ABOUT 1550*F. AND ABOUT 1850*F., WITH A FLOW OF HYDROGEN-CONTAINING REDUCTION GAS HAVING A DEW POINT BELOW ABOUT 120*F. FOR A TIME SUFFICIENT TO REDUCE THE IRON OXIDE IN SAID MIX-
Claim 2
Dependent Claim
161 words
A PROCESS FOR PRODUCING IRON POWDER WHICH COMPRISES THE STEPS OF: (A) FORMING A UNIFORMLY BLENDED POWDERED MIXTURE COMPRISING: (1) FINELY DIVIDED IRON OXIDE HAVING AN OXYGEN CONTENT BETWEEN ABOUT 6 AND 30 WEIGHT PERCENT, BASIS THE WEIGHT OF THE IRON OXIDE, AND CONTAINING LESS THAN ABOUT ONE WEIGHT PERCENT OF ACID INSOLUBLES; (2) FINELY DIVIDED, SOLID, CARVONACEOUS MATERIAL, IN AN AMOUNT SUFFICIENT TO PROVIDE AN IRON OXIDE OXYGEN TO FREE CARBON ATOMIC RATIO IN SAID MIXTURE OF FROM ABOUT 1.5:1 TO ABOUT 3:1; AND (3) OPTIONALLY UP TO ABOUT 3 WEIGHT PERCENT, BASIS THE WEIGHT OF THE IRON OXIDE, OF A FINELY DIVIDED METAL CARBONATE SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METAL CARBONATES; (B) CONTACTING SAID MIXTURE IN A REDUCTION ZONE, AT A TEMPERATURE BETWEEN ABOUT 1550*F. AND ABOUT 1850*F., WITH A FLOW OF HYDROGEN-CONTAINING REDUCTION GAS HAVING A DEW POINT BELOW ABOUT 120*F. FOR A TIME SUFFICIENT TO REDUCE THE IRON OXIDE IN SAID MIX-
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |