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Galvanically destructing metal structures

Assignee: Dow Chemical Co
•
Filing: 1970-01-21
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Granted: 1971-12-21
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Expires: 1990-01-21
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Abstract

Abstract A metal laminate is provided which will deteriorate at least in part after the interior of the laminate is contacted by moisture. Self-destructing containers are fabricated of this structural laminate. The laminate includes at least two layers of dissimilar metals, the layers being electronically connected and one layer being anodic to the other layer. Positioned between the metal layers is at least one layer of an electrolyte-forming composition capable of establishing ionic communication between the metal layers when the composition is contacted with moisture. A preferred electrolyte-forming composition is an inorganic salt, such as ammonium chloride or sodium chloride. When the electrolyte-forming composition is contacted by sufficient moisture to provide ionic conduction between the metal layers, a galvanic cell is formed in which the anodic metal layer deteriorates by galvanic corrosion.

Inventors

  • 👤 Percy F George

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 21:36
CPC Classifications
B; B65; B65D; B65D7/00; Y; Y10; Y10S; Y10S220/00; Y10S220/30; Y10S220/906; Y10S220/917; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/936; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12736

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 20 words
The container of claim 1 which includes means integral with the laminate structure for severing a portion of the laminate.
Claim 2
Dependent Claim 20 words
The container of claim 1 in which the overall thickness of the laminate is not more than about 0.250 inch.
Claim 3
Dependent Claim 15 words
The container of claim 1 in which the electrolyte-forming composition is sealed from the atmosphere.
Claim 4
Dependent Claim 20 words
The container of claim 1 in which the electrode potential difference between the metal layers is at least 0.10 volt.
Claim 5
Dependent Claim 18 words
The container of claim 1 in which the electrolyte-forming composition is impregnated into a strip of bibulous material.
Claim 6
Dependent Claim 19 words
The container of claim 1 in which the electrolyte-forming composition is a dry, essentially nonconducting, water-soluble, ionizable inorganic salt.
Claim 7
Dependent Claim 25 words
The container of claim 1 in which one of the metal layers is an aluminum-based metal and the other metal layer is an iron-based metal.
Claim 8
Dependent Claim 13 words
The container of claim 8 in which the electrolyte-forming composition is ammonium chloride.
Claim 9
Dependent Claim 99 words
A metal container having at least one sidewall member, a top wall member and a bottom wall member, the respective wall members comprising a structural laminate including: a. at least a first metal layer and a second metal layer wherein the metal layers are electronically connected and one of the layers is anodic to the other layer: b. at least one layer of an electrolyte-forming composition comprising an inorganic metal or nonmetal salt, the electrolyte-forming composition being positioned between the metal layers and being capable, when contacted with moisture, of ionizing to provide ionic communication between the metal layers.
Claim 10
Dependent Claim 64 words
The container of claim 10 which includes a chime portion formed by the juncture of the top wall member and bottom wall member with the sidewall member, wherein adjacent metal layers in the said chime portions have at least one perforation therethrough to enhance moisture communication between the said top wall member and sidewall member and the said bottom wall member and sidewall member.

References Cited (Backward Citations)

US1837051A Cited
US1811160A Cited
GB368816A Cited
US2490978A Cited
US2722311A Cited
GB853946A Cited
US3265598A Cited
US3210840A Cited
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US3388824A Cited
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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) 1974-12-20 1975-06-21 1975-12-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-12-20 1979-06-21 1979-12-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-12-20 1983-06-21 1983-12-21 $7700.00 Window Closed / Lapsed

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