US4895609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activated metal and method of preparing
Assignee: Alloy Surfaces Co Inc
•
Filing: 1988-06-10
•
Granted: 1990-01-23
•
Expires: 2008-06-10
Abstract
Abstract Metals are made pyrophoric by diffusing aluminum or zinc into them and then leaching it out, or by reacting with aluminum and then leaching aluminum out. Powdered aluminum and powdered nickel, iron or cobalt, can thus be carried on an elongated support web and reacted by heating for a few seconds to a few minutes, after which leaching will provide elongated pyrophoric foil suitable for decoying heat-seeking missile.
Inventors
- 👤 Alfonso L. Baldi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:58
CPC Classifications
C; C06; C06B; C06B45/00; B; B22; B22F; B22F7/00; B22F7/002; C06B21/00; C06B21/0083; C06B45/12; C06B45/14; C06C; C06C15/00; H; H05; H05K; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/12063
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
109 words
In the process of preparing a continuous length of pyrophoric metal, the steps of providing a continuous length of a carrier web not over about 3/4 millimeter thick, applying to the web a layer at least about 1/50 millimeter thick of a mixture of aluminum powder and nickel, iron or cobalt powder, the powders being in the proportion of a Raney alloy, and the powder particles being sufficiently small to essentially completely interact when heated, and heating the layer-carrying web to cause the powder particles to essentially completely interact and adhere to the web, the web being sufficiently heat resistant so that it is not disintegrated by the process.
Claim 2
Dependent Claim
109 words
In the process of preparing a continuous length of pyrophoric metal, the steps of providing a continuous length of a carrier web not over about 3/4 millimeter thick, applying to the web a layer at least about 1/50 millimeter thick of a mixture of aluminum powder and nickel, iron or cobalt powder, the powders being in the proportion of a Raney alloy, and the powder particles being sufficiently small to essentially completely interact when heated, and heating the layer-carrying web to cause the powder particles to essentially completely interact and adhere to the web, the web being sufficiently heat resistant so that it is not disintegrated by the process.
Claim 3
Dependent Claim
19 words
The combination of claim 1 in which the heating is for a time no longer than about three minutes.
Claim 4
Dependent Claim
24 words
The combination of claim 1 in which the heating step is followed by a caustic leach to convert the interacted particles into pyrophoric metal.
Claim 5
Dependent Claim
26 words
The combination of claim 3 in which after the conversion into pyrophoric metal the web-supported pyrophoric metal is cut into pieces suitable for decoying heat-seeking missiles.
Claim 6
Dependent Claim
24 words
The combination of claim 1 in which the web is perforated and the powder mixture is applied as a slurry in a binder-containing liquid.
Claim 7
Dependent Claim
14 words
The combination in claim 5 in which the web is a length of screening.
Claim 8
Dependent Claim
9 words
The product produced by the combination of claim 1.
Claim 9
Dependent Claim
9 words
The product produced by the combination of claim 3.
Claim 10
Dependent Claim
18 words
The combination of claim 3 in which the powder mixture also contains about 1/2 to about 5% boron.
Claim 11
Dependent Claim
19 words
The combination of claim 1 in which the heating is for a time no longer than about 3 seconds.
Claim 12
Dependent Claim
27 words
The combination of claim 3 in which the leached product is subjected to a compaction step to reduce the overall thickness of and compact the leached layer.
Claim 13
Dependent Claim
20 words
The combination of claim 1 in which the carrier web is a metal foil not over about 1/4 millimeter thick.
Claim 14
Dependent Claim
44 words
A pyrophoric foil having a core web not over about 3/4 mm thick to which is anchored a layer at least about 1/50 mm thick, the layer being an openly porous array of pyrophoric particles sintered together, the particles themselves having a microporous structure.
Claim 15
Dependent Claim
44 words
A pyrophoric foil having a core web not over about 3/4 mm thick to which is anchored a layer at least about 1/50 mm thick, the layer being an openly porous array of pyrophoric particles sintered together, the particles themselves having a microporous structure.
Claim 16
Dependent Claim
15 words
The combination of claim 13 in which the particles are sintered to the core web.
Claim 17
Dependent Claim
19 words
The combination of claim 13 in which the web is fenestrated and the particles penetrate through the web openings.
Claim 18
Dependent Claim
20 words
The combination of claim 13 in which the core web is metal and is not over about 1/10 mm thick.
References Cited (Backward Citations)
US4349612A
Cited
US4799979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |