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US3784371A Expired / Lapsed US ⏱️ 0.0 years remaining

Corrosion resistant frozen wall

Assignee: Dow Chemical Co
•
Filing: 1971-12-27
•
Granted: 1974-01-08
•
Expires: 1991-12-27
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Abstract

Abstract Highly corrosive molten or vaporous halometaliferous systems comprising metals and metal halides are confined by heat transferring walls on which a frozen layer of the highest melting component of the system is maintained as a protective coating. The confining walls are in essence composites which, in transverse cross-section, consist of a thermally conductive structural wall member having an adherent solid layer of the highest melting component of the confined system. The structural member is continuously cooled sufficiently to maintain its temperature below the melting point of the adhering solid layer. In one embodiment of the invention, the protected walls are employed as heat exchanging surfaces on which vaporous mixtures of metal halides and metal vapors are condensed.

Inventors

  • 👤 L Bangs
  • 👤 J Huml
  • 👤 G Layne

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 07:47
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/0038; C22B21/0046

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 38 words
A method as in claim 1 and including the additional step of collecting the condensate in a vessel, the walls of which are protected by a frozen layer of magnesium fluoride produced upon condensation of the halometalliferous vapors.
Claim 2
Dependent Claim 20 words
The method of claim 1 wherein said structural wall member is preferentially wet by the metal halide relative to aluminum.
Claim 3
Dependent Claim 24 words
The method of claim 1 including maintaining the frozen layer at a thickness within the range of from about 0.5 to about 1,000 millimeters.

References Cited (Backward Citations)

US2184705A Cited
US2271023A Cited
US2470305A Cited
US2720456A Cited
US2724644A Cited
GB734480A Cited
US3136627A Cited
US3397056A Cited
US3477812A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-01-07 1977-07-09 1978-01-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-01-07 1981-07-09 1982-01-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-01-07 1985-07-09 1986-01-08 $7700.00 Window Closed / Lapsed

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