US3903238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chlorination of tungsten-base alloys
Assignee: Rederi Nordstjernan AB
•
Filing: 1973-08-09
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Granted: 1975-09-02
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Expires: 1993-08-09
Abstract
Abstract A tungsten-base alloy is provided capable of being easily halogenated to form volatile halides from which tungsten values are easily recovered. The tungsten-base alloy contains at least one metal from the group Fe, Co, Ni, Mn and at least one metal from the group consisting of Si and Al. One embodiment resides in halogenating the aforementioned alloy in particulate form with, for example, chlorine while leaving behind very little residues.
Inventors
- 👤 Nils Olle Grinder
- 👤 Lars Henry Ramqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:16
CPC Classifications
C; C22; C22C; C22C27/00; C22C27/04; C01; C01G; C01G41/00; C22B; C22B34/00; C22B34/30; C22B34/36
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
130 words
IN A METHOD OF CHLORINATING TUNGSTEN-BASE ALLOYS CONTAINING AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF FE, CO, NI AND MN AND AT LEAST ONE METAL FROM THE GROUP CONSISTING OF SI AND AL, WHEREIN SAID ALLOY IS CONVERTED TO A GASEOUS MIXTURE OF METAL CHLORIDES, THE IMPROVEMENT OF MINIZING THE AMOUNT OF RESIDUE REMAINING FROM SAID CHLORINATION WHICH COMPRISES SELECTING SAID TUNGSTEN-BASE ALLOY IN A CRUSHED, PARTICULATE FORM AND HAVING A CONTROLLED COMPOSITION DEFINED BY AREA BCFGB OF THE ACCOMPANYING DRAWING, AND THEN CHLORINATING IN A REACTOR SAID PARTICULATE ALLOY AT A TEMPERATURE WITHIN THE RANGE OF 400* TO 1000*C WHEREIN SAID ALLOY IS CONVERTED SUBSTANTIALLY TO A GASEOUS MIXTURE OF METAL CHLORINES, SAID REACTOR BEING RUSHED WITH NITROGEN GAS DURING THE HEATING BEING FLUSHED WITH NITROREACTOR.
Claim 2
Dependent Claim
130 words
IN A METHOD OF CHLORINATING TUNGSTEN-BASE ALLOYS CONTAINING AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF FE, CO, NI AND MN AND AT LEAST ONE METAL FROM THE GROUP CONSISTING OF SI AND AL, WHEREIN SAID ALLOY IS CONVERTED TO A GASEOUS MIXTURE OF METAL CHLORIDES, THE IMPROVEMENT OF MINIZING THE AMOUNT OF RESIDUE REMAINING FROM SAID CHLORINATION WHICH COMPRISES SELECTING SAID TUNGSTEN-BASE ALLOY IN A CRUSHED, PARTICULATE FORM AND HAVING A CONTROLLED COMPOSITION DEFINED BY AREA BCFGB OF THE ACCOMPANYING DRAWING, AND THEN CHLORINATING IN A REACTOR SAID PARTICULATE ALLOY AT A TEMPERATURE WITHIN THE RANGE OF 400* TO 1000*C WHEREIN SAID ALLOY IS CONVERTED SUBSTANTIALLY TO A GASEOUS MIXTURE OF METAL CHLORINES, SAID REACTOR BEING RUSHED WITH NITROGEN GAS DURING THE HEATING BEING FLUSHED WITH NITROREACTOR.
Claim 3
Dependent Claim
22 words
The method of claim 1, wherein up to 10% of the tungsten in the alloy subjected to chlorination is replaced by molybdenum.
References Cited (Backward Citations)
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US2021021A
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US2992916A
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US2977225A
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US3711592A
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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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |