US4555422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat shrinkable magnetic shielding article
Assignee: Fujikura Ltd
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Filing: 1984-01-10
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Granted: 1985-11-26
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Expires: 2004-01-10
Abstract
Abstract An article comprising a magnetic shielding thermoplastic polymeric material containing a powdery ferrite and a heat shrinkable thermoplastic polymeric material layer. Due to its specific structure, this article is excellent in applicability over any electrical component, and may provide over the component a cover having excellent magnetic shielding and mechanical strength properties. It may also bring about a substantial increase in inductance of the component.
Inventors
- 👤 Koichi Nakamura
- 👤 Masashi Ishibashi
- 👤 Hideki Kameda
- 👤 Minoru Makiyo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:37
CPC Classifications
B; B29; B29C; B29C61/00; B29C61/06; B29C61/0608; B29C61/0616; H; H01; H01R; H01R4/00; H01R4/70; H01R4/72; H02; H02G; H02G15/00; H02G15/08; H02G15/18; H02G15/184; H02G15/188; Y; Y10; Y10S; Y10S174/00; Y10S174/08; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/24; Y10T428/24628; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31551; Y10T428/31565; Y10T428/31573; Y10T428/31652; Y10T428/31663; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31931
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
128 words
A heat shrinkable magnetic shielding article which comprises: a heat shrinkable layer comprising a thermoplastic polymeric material; and, arranged under the layer, directly or via an adhesive layer, a magnetic shielding layer comprising a thermoplastic polymeric material and at least one powdery ferrite selected from the group consisting of MnO.Fe 2 O 3 , FeO.Fe 2 O 3 , CoO.Fe 2 O 3 , NiO.Fe 2 O 3 , CuO.Fe 2 O 3 and ZnO.Fe 2 O 3 , said magnetic shielding layer being heat shrinkable or being adapted to flow due to the force exerted by shrinkage of the heat shrinkable layer, said ferrite being contained in the magnetic shielding layer in an amount of from 10 to 90% based on the total weight of the layer.
Claim 2
Dependent Claim
128 words
A heat shrinkable magnetic shielding article which comprises: a heat shrinkable layer comprising a thermoplastic polymeric material; and, arranged under the layer, directly or via an adhesive layer, a magnetic shielding layer comprising a thermoplastic polymeric material and at least one powdery ferrite selected from the group consisting of MnO.Fe 2 O 3 , FeO.Fe 2 O 3 , CoO.Fe 2 O 3 , NiO.Fe 2 O 3 , CuO.Fe 2 O 3 and ZnO.Fe 2 O 3 , said magnetic shielding layer being heat shrinkable or being adapted to flow due to the force exerted by shrinkage of the heat shrinkable layer, said ferrite being contained in the magnetic shielding layer in an amount of from 10 to 90% based on the total weight of the layer.
Claim 3
Dependent Claim
34 words
An article according to claim 1, which further comprises a second heat shrinkable layer comprising a thermoplastic polymeric material, said layer being arranged, directly or via an adhesive layer, under the magnetic shielding layer.
Claim 4
Dependent Claim
17 words
An article according to claim 1, wherein said heat shrinkable layer comprises a crosslinked thermoplastic polymeric material.
Claim 5
Dependent Claim
40 words
An article according to claim 1, wherein said heat shrinkable layer comprises a crosslinked thermoplastic polymeric material and further at least one additive selected from the group consisting of coloring agents, basic materials, filling materials, plasticizers, crosslinking agents and antioxidants.
Claim 6
Dependent Claim
19 words
An article according to claim 1, wherein said ferrite has a particle diameter of from 3 to 300 microns.
Claim 7
Dependent Claim
12 words
An article according to claim 1, which is in a tubing form.
Claim 8
Dependent Claim
15 words
An article according to claim 6, wherein said tubing form has a circular cross section.
Claim 9
Dependent Claim
12 words
An article according to claim 1, which is in a planar form.
Claim 10
Dependent Claim
12 words
An article according to claim 1, which is in a cap form.
Claim 11
Dependent Claim
34 words
An article according to claim 1, wherein said magnetic shielding layer has a thickness of from 1.0 to 2.5 mm and said heat shrinkable layer has a thickness of from 0.2 to 2.5 mm.
Claim 12
Dependent Claim
18 words
An article according to claim 1, wherein said magnetic shielding layer comprises a copolymer of ethylene and propylene.
Claim 13
Dependent Claim
18 words
An article according to claim 1, wherein said magnetic shielding layer comprises a polyester elastomer or silicone rubber.
Claim 14
Dependent Claim
14 words
An article according to claim 1, wherein said heat shrinkable layer comprises a polyolefin.
Claim 15
Dependent Claim
22 words
An article according to claim 1, wherein said heat shrinkable layer comprises a polyester elastomer, or elastomeric copolymer of ethylene and propylene.
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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) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |