US4699743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering a heat shrinkable magnetic shielding article over an electrical component
Assignee: Fujikura Ltd
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Filing: 1985-08-30
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Granted: 1987-10-13
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Expires: 2005-08-30
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
2026-10-30 19:53
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
200 words
A method for providing a magnetic shielding over an electrical component which comprises: (1) positioning over an electrical component 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; (2) heating the heat shrinkable magnetic shielding article on its side of the heat shrinkable layer, causing the article to shrink over the electrical component, thereby to provide over the component a cover having excellent magnetic shielding and mechanical strength properties, said cover bringing about a substantial increase in inductance of the component.
Claim 2
Independent Claim
200 words
A method for providing a magnetic shielding over an electrical component which comprises: (1) positioning over an electrical component 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; (2) heating the heat shrinkable magnetic shielding article on its side of the heat shrinkable layer, causing the article to shrink over the electrical component, thereby to provide over the component a cover having excellent magnetic shielding and mechanical strength properties, said cover bringing about a substantial increase in inductance of the component.
Claim 3
Dependent Claim
105 words
A method according to claim 1, wherein as the heat shrinkable magnetic shielding article use is made of an article which comprises a first heat shrinkable layer comprising a thermoplastic polymeric material and, arranged under the shrinkable layer, directly or via a first adhesive layer, a magnetic shielding layer comprising a thermoplastic polymeric material and powdery ferrite, and further, arranged under the shielding layer, directly or via a second adhesive layer, a second heat shrinkable layer comprising a thermoplastic polymeric material, said magnetic shielding layer being heat shrinkable or being adapted to flow due to the force exerted by shrinkage of the heat shrinkable layer.
Claim 4
Dependent Claim
26 words
A method according to claim 1, wherein as the thermoplastic polymeric material of the heat shrinkable layer use is made of a crosslinked thermoplastic polymeric material.
Claim 5
Dependent Claim
35 words
A method according to claim 3, wherein at least one additive selected from the group consisting of coloring agents, basic materials, filling materials, plasticizers, crosslinking agents and antioxidants is contained in the heat shrinkable layer.
Claim 6
Dependent Claim
19 words
A method according to claim 1, wherein said ferrite has a particle diameter of from 3 to 300 microns.
Claim 7
Dependent Claim
23 words
A method according to claim 1, wherein as the heat shrinkable magnetic shielding article use is made of one in a tubing form.
Claim 8
Dependent Claim
15 words
A method according to claim 6, wherein said tubing form has a circular cross section.
Claim 9
Dependent Claim
23 words
A method according to claim 1, wherein as the heat shrinkable magnetic shielding article use is made of one in a planar form.
Claim 10
Dependent Claim
23 words
A method according to claim 1, wherein as the heat shrinkable magnetic shielding article use is made of one in a cap form.
Claim 11
Dependent Claim
34 words
A method 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
27 words
A method according to claim 1, wherein as the thermoplastic polymeric material of the magnetic shielding layer use is made of a copolymer of ethylene and propylene.
Claim 13
Dependent Claim
27 words
A method according to claim 1, wherein as the thermoplastic polymeric material of the magnetic shielding layer use is made of a polyester elastomer or silicone rubber.
Claim 14
Dependent Claim
23 words
A method according to claim 1, wherein as the thermoplastic polymeric material of the heat shrinkable layer use is made of a polyolefin.
Claim 15
Dependent Claim
32 words
A method according to claim 1, wherein as the thermoplastic polymeric material of the heat shrinkable layer use is made of a polyester elastomer or an 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) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |