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US4992329A
Expired / Lapsed
US
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Magnetic-shielding sheet
Assignee: Riken and Simizu Construction Co
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Filing: 1989-03-24
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Granted: 1991-02-12
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Expires: 2009-03-24
Abstract
Abstract A magnetic-shielding sheet comprising a laminated-structure layer of soft magnetic amorphous alloy flakes, said soft magnetic amorphous alloy flakes being of 5 to 100 μm thick and 10-15000 in aspect ratio (ratio of maximum length to maximum thickness) is provided.
Inventors
- 👤 Hiroyoshi Ishii
- 👤 Kenzo Suzuki
- 👤 Misao Kaneko
- 👤 Noboru Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:21
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/06; B22F9/08; B22F9/10; H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0086; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15358; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/29; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
A magnetic-shielding sheet against static and low frequency magnetic fields having flexibility and comprising a laminated-structural layer of soft magnetic amorphous alloy flakes being interposed between non-metal films, each of said soft magnetic amorphous alloy flakes being 20 to 60 μm thick and having an aspect ratio of 50 to 10,000; said soft magnetic amorphous alloy flakes being distributed along said non-metal film's plane direction in such a manner that said flakes substantially contact each other and are laminated in said non-metal film's thickness direction in such a manner as to substantially contact each other.
Claim 2
Dependent Claim
95 words
A magnetic-shielding sheet against static and low frequency magnetic fields having flexibility and comprising a laminated-structural layer of soft magnetic amorphous alloy flakes being interposed between non-metal films, each of said soft magnetic amorphous alloy flakes being 20 to 60 μm thick and having an aspect ratio of 50 to 10,000; said soft magnetic amorphous alloy flakes being distributed along said non-metal film's plane direction in such a manner that said flakes substantially contact each other and are laminated in said non-metal film's thickness direction in such a manner as to substantially contact each other.
Claim 3
Dependent Claim
33 words
A magnetic shielding sheet as claimed in claim 1 wherein said soft magnetic amorphous alloy flakes are cobalt-based amorphous alloy flakes of magnetostriction (-10 to +10)×10 -6 and magnetic permeability 1000 or more.
Claim 4
Dependent Claim
30 words
A magnetic shielding sheet as claimed in claim 1 wherein said soft magnetic amorphous alloy flakes are iron based amorphous alloy flakes of magnetic flux density 12000 gausses or more.
Claim 5
Dependent Claim
49 words
A magnetic shielding sheet as claimed in claim 1 wherein said soft magnetic amorphous alloy flakes are composed of cobalt-based amorphous alloy flakes of magnetostriction (-10 to +10)×10 -6 and magnetic permeability 1000 or more and an iron-based amorphous alloy flakes of magnetic flux density 12000 gausses or more.
Claim 6
Dependent Claim
27 words
A magnetic shielding sheet as claimed in claim 1 wherein said soft magnetic amorphous alloy flakes are laminated in the state uniformly distributed and directed at random.
Claim 7
Dependent Claim
21 words
A magnetic shielding sheet as claimed in claim 1 wherein said soft magnetic amorphous alloy flakes are flaked or squamose pieces.
References Cited (Backward Citations)
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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) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |