US4189618A
Expired / Lapsed
US
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Electromagnetic shielding envelopes from wound glassy metal filaments
Assignee: Honeywell International Inc
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Filing: 1978-07-31
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Granted: 1980-02-19
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Expires: 1998-07-31
Abstract
Abstract Efficient electromagnetic shielding envelopes made of wound metallic glass filaments are disclosed. They are made by winding the filaments around a suitably shaped mandrel and embedding the filaments in a matrix. These shielding envelopes have high shielding ratios at low magnetic fields and are easily manufactured.
Inventors
- 👤 Gerald R. Bretts
- 👤 Dirk A. Timan
- 👤 Gregory J. Sellers
- 👤 Wayne H. Witte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:23
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/009; C; C22; C22C; C22C45/00; C22C45/008; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; H01J; H01J1/00; H01J1/52; H01J29/00; H01J29/86; H01J29/867; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/249921; Y10T428/249922
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
34 words
An electromagnetic shielding envelope comprising a shell of a wound metallic glass filament which is primarily glassy and has a maximum permeability of at least about 25,000, said filament being embedded in a matrix.
Claim 2
Dependent Claim
34 words
An electromagnetic shielding envelope comprising a shell of a wound metallic glass filament which is primarily glassy and has a maximum permeability of at least about 25,000, said filament being embedded in a matrix.
Claim 3
Dependent Claim
87 words
The envelope of claim 1 wherein the metallic glass filament consists essentially of about 70 to 90 atom percent of at least one metal selected from the group consisting of iron and cobalt, up to about 3/4 of which may be replaced by nickel, and the balance at least one metalloid selected from the group consisting of boron, carbon and phosphorus, up to about 3/5 of which may be replaced by silicon, and up to about 1/3 of which may be replaced by aluminum, plus incidental impurities.
Claim 4
Dependent Claim
23 words
The envelope of claim 2 wherein the metallic glass filament provides at least about 60 percent coverage of the area of the envelope.
Claim 5
Dependent Claim
16 words
The envelope of claim 2 employing up to about 30 layers of wound metallic glass filament.
Claim 6
Dependent Claim
24 words
The envelope of claim 2 employing at least two layers of metallic glass filament, which are spaced apart by means of a nonmagnetic spacer.
Claim 7
Dependent Claim
12 words
The envelope of claim 5 wherein the spacer is an electrical insulator.
Claim 8
Dependent Claim
12 words
The envelope of claim 5 wherein the spacer is an electrical conductor.
Claim 9
Dependent Claim
19 words
The envelope of claim 2 in form of a cylindrical shell wherein the metallic glass filament is helically wound.
Claim 10
Dependent Claim
18 words
The envelope of claim 8 wherein the helically wound metallic glass filament is embedded in a flexible matrix.
Claim 11
Dependent Claim
18 words
The envelope of claim 9 wherein the helically wound metallic glass filament is embedded in a rigid matrix.
Claim 12
Dependent Claim
74 words
The method for making electromagnetic shielding envelopes of claim 1 which comprises winding a metallic glass filament which is primarily glassy and has a maximum permeability of at least about 25,000 around a mandrel having the desired shape of the envelope, applying a liquid resin composition curable to the solid state to the wound filament to embed the filament therein, followed by curing the resin composition to the solid state and withdrawing the mandrel.
Claim 13
Dependent Claim
31 words
The method of claim 11 wherein the metallic glass filament is wound around the mandrel to obtain even coverage of at least about 60 percent of the surface of the mandrel.
Claim 14
Dependent Claim
28 words
The method of claim 11 wherein the envelope is subjected to thermal annealing at temperature above the Curie temperature but below the crystallization temperature of the metallic glass.
Claim 15
Dependent Claim
49 words
The method of claim 13 wherein the envelope is subjected to thermal annealing at temperature at least about 25° C. above the Curie temperature but at least about 15° below the crystallization temperature of the metallic glass for time period of between about 1 second and about 10 hours.
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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) | 1983-02-18 | 1983-08-20 | 1984-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-18 | 1987-08-20 | 1988-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-18 | 1991-08-20 | 1992-02-19 | $7700.00 | Window Closed / Lapsed |