US4530949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Housing for electrical or electronic equipment
Assignee: T&N Materials Research Ltd
•
Filing: 1984-07-19
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Granted: 1985-07-23
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Expires: 2004-07-19
Abstract
Abstract A housing for electrical or electronic equipment is made by moulding under heat a composition comprising an organic thermosetting resin which includes exfoliated graphite in an amount which is enough to impart to the moulded article an electrical resistivity not greater than 10 ohm-cm. The housing has an excellent capacity to reduce the level of electromagnetic radiation emitted by equipment within it and to shield electronic equipment from external electromagnetic radiation.
Inventors
- 👤 Alan W. Atkinson
- 👤 David R. Hurst
- 👤 Kenneth T. Somerfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:21
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0083; H05K9/0007; H05K9/0047
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
A housing for electrical or electronic equipment made by moulding under heat a composition comprising an organic thermosetting resin which contains an amount of heat-exfoliated porous graphite of density below 100 kg/m 3 , said amount being sufficient to impart to the moulded article an electrical resistivity not greater than 10 ohm-cm and forming 0.5 to 20% by weight of the composition.
Claim 2
Dependent Claim
62 words
A housing for electrical or electronic equipment made by moulding under heat a composition comprising an organic thermosetting resin which contains an amount of heat-exfoliated porous graphite of density below 100 kg/m 3 , said amount being sufficient to impart to the moulded article an electrical resistivity not greater than 10 ohm-cm and forming 0.5 to 20% by weight of the composition.
Claim 3
Dependent Claim
22 words
A housing according to claim 1, in which the amount of exfoliated graphite forms 2.5 to 20% by weight of the composition.
Claim 4
Dependent Claim
22 words
A housing according to claim 1, in which the amount of exfoliated graphite forms 5 to 20% by weight of the composition.
Claim 5
Dependent Claim
19 words
A housing according to claim 1, in which the organic thermosetting resin forms 20-95% by weight of the composition.
Claim 6
Dependent Claim
19 words
A housing according to claim 3, in which the composition contains up to 60% by weight of reinforcing fibre.
Claim 7
Dependent Claim
19 words
A housing according to claim 3, in which the composition contains up to 60% by weight of non-fibrous filler.
Claim 8
Dependent Claim
15 words
A housing according to claim 1 in which the thermosetting resin is a phenolic resin.
Claim 9
Dependent Claim
16 words
A housing according to claim 1 in which the thermosetting resin is an unsaturated polyester resin.
Claim 10
Dependent Claim
64 words
A housing for electrical or electronic equipment made by moulding under heat a composition consisting essentially of an organic thermosetting resin which contains an amount of heat-exfoliated porous graphite of density below 100 kg/m 3 , said amount being sufficient to impart to the moulded article an electrical resistivity not greater than 10 ohm-cm and forming 0.5 to 20% by weight of the composition.
Claim 11
Dependent Claim
64 words
A housing for electrical or electronic equipment made by moulding under heat a composition consisting essentially of an organic thermosetting resin which contains an amount of heat-exfoliated porous graphite of density below 100 kg/m 3 , said amount being sufficient to impart to the moulded article an electrical resistivity not greater than 10 ohm-cm and forming 0.5 to 20% by weight of the composition.
References Cited (Backward Citations)
US3389200A
Cited
US3801727A
Cited
GB1411731A
Cited
GB1429576A
Cited
GB2046274A
Cited
GB2072694A
Cited
US4382882A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |