US3271141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a columbium addition agent
Assignee: Elkem Metals Co LP
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Filing: 1964-02-13
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Granted: 1966-09-06
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Expires: 1984-02-13
Abstract
No abstract record available.
Inventors
- 👤 Thomas F Kaveney
- 👤 Rodney F Merkert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:49
CPC Classifications
E; E04; E04G; E04G1/00; E04G1/34; C; C21; C21C; C21C7/00; C21C7/0006; C22; C22C; C22C27/00; C22C27/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A PROCESS FOR PRODUCING A SINTERED, COLUMBIUMCONTAINING, LOW-CARBON FERROCHROMIUM ADDITION AGENT WHICH COMPRISES ADMIXING A PARTICULATE HIGH-CARBON FERROCHROMIUM, A PARTICULATE OXIDIC COLUMBIUM MATERIAL, AND A BINDER; COMPACTING THE RESULTING ADMIXTURE SO AS TO FORM A COHERENT BODY, HEATING THE COHERENT BODY UNDER A PRESSURE BELOW ABOUT 3 MM. OF HG TO A TEMPERATURE BELOW ABOUT 1500*C. BUT SUFFICIENTLY HIGH TO REACT THE CARBON PRESENT IN THE FERROCHROMIUM WITH THE OXYGEN PRESENT IN THE OXIDIC COLUMBIUM MATERIALS; MAINTAININT THE COHERENT BODY AT SUCH TEMPERATURE AND PRESSURE UNTIL THE EVOLUTION OF CARBON OXIDES SUBSTANTIALLY SUBSIDES; AND THEREAFTER RECOVERING THE SINTERED, COLUMBIUM-CONTAINING, LOW-CARBON FERROCHROMIUM ADDITION AGENT.
Claim 2
Dependent Claim
103 words
A PROCESS FOR PRODUCING A SINTERED, COLUMBIUMCONTAINING, LOW-CARBON FERROCHROMIUM ADDITION AGENT WHICH COMPRISES ADMIXING A PARTICULATE HIGH-CARBON FERROCHROMIUM, A PARTICULATE OXIDIC COLUMBIUM MATERIAL, AND A BINDER; COMPACTING THE RESULTING ADMIXTURE SO AS TO FORM A COHERENT BODY, HEATING THE COHERENT BODY UNDER A PRESSURE BELOW ABOUT 3 MM. OF HG TO A TEMPERATURE BELOW ABOUT 1500*C. BUT SUFFICIENTLY HIGH TO REACT THE CARBON PRESENT IN THE FERROCHROMIUM WITH THE OXYGEN PRESENT IN THE OXIDIC COLUMBIUM MATERIALS; MAINTAININT THE COHERENT BODY AT SUCH TEMPERATURE AND PRESSURE UNTIL THE EVOLUTION OF CARBON OXIDES SUBSTANTIALLY SUBSIDES; AND THEREAFTER RECOVERING THE SINTERED, COLUMBIUM-CONTAINING, LOW-CARBON FERROCHROMIUM ADDITION AGENT.
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) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |