Patent US3214262A successfully refreshed from Google Patents.
US3214262A
Expired / Lapsed
US
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Process for producing dense iron powders from sponge iron
Assignee: Huettenwerk Oberhausen AG
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Filing: 1962-11-19
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Granted: 1965-10-26
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Expires: 1982-11-19
Abstract
No abstract record available.
Inventors
- 👤 Bogdandy Ludwig Von
- 👤 Eisfelder Hans-Jurgen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:10
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0235; B; B22; B22F; B22F9/00; B22F9/02; B22F9/04; B22F9/16; B22F9/18; B22F9/20; B22F9/22; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/365; C21; C21B; C21B13/00; C21B13/0046; C21B13/0086; C21B13/08; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A METHOD OF PRODUCING DENSE IRON POWDER HAVING LIMITED POROSITY, COMPRISING THE SUCCESSIVE STEPS OF AGGLOMERATING AN IORN-OXIDE POWDER TO PRODUCE COHERENT BRIQUETTES THEREOF HAVING A DIAMETER BETWEEN SUBSTANTIALLY 10 AND 50 MM.; HEATING SAID BRIQUETTES IN A REDUCING ATMOSPHERE TO CONVERT SAID BRIQUETTES OF IORN-OXIDE INTO COHERENT BODIES CONSISTING SUBSTANTIALLY EXCLUSIVELY OF SPONGE IRON; COOLING SAID BODIES; THEREAFTER HEATING SAID BODIES IN THEIR COHERENT STATE TO A TEMPERATURE BETWEEN SUBSTANTIALLY 1000* AND 1400*C. IN A NONOXIDIZING ATMOSPHERE FOR A PERIOD BETWEEN SUBSTANTIALLY ONE-HALF AND THREE HOURS; AND THEREAFTER COMMINUTING SAID BODIES TO PRODUCE A POWDER HAVING A PARTICLE SIZE LESS THAN APPROXIMATELY 1 MM.
Claim 2
Independent Claim
105 words
A METHOD OF PRODUCING DENSE IRON POWDER HAVING LIMITED POROSITY, COMPRISING THE SUCCESSIVE STEPS OF AGGLOMERATING AN IORN-OXIDE POWDER TO PRODUCE COHERENT BRIQUETTES THEREOF HAVING A DIAMETER BETWEEN SUBSTANTIALLY 10 AND 50 MM.; HEATING SAID BRIQUETTES IN A REDUCING ATMOSPHERE TO CONVERT SAID BRIQUETTES OF IORN-OXIDE INTO COHERENT BODIES CONSISTING SUBSTANTIALLY EXCLUSIVELY OF SPONGE IRON; COOLING SAID BODIES; THEREAFTER HEATING SAID BODIES IN THEIR COHERENT STATE TO A TEMPERATURE BETWEEN SUBSTANTIALLY 1000* AND 1400*C. IN A NONOXIDIZING ATMOSPHERE FOR A PERIOD BETWEEN SUBSTANTIALLY ONE-HALF AND THREE HOURS; AND THEREAFTER COMMINUTING SAID BODIES TO PRODUCE A POWDER HAVING A PARTICLE SIZE LESS THAN APPROXIMATELY 1 MM.
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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) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |