Patent US4574111A successfully refreshed from Google Patents.
US4574111A
Expired / Lapsed
US
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Electric insulation
Assignee: Siemens AG
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Filing: 1985-06-28
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Granted: 1986-03-04
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Expires: 2005-06-28
Abstract
Abstract The invention relates to electric insulation of polyolefin suitable for medium and high voltage from about 10 kV which resists the formation of so-called water trees. For this purpose, the insulation contains as an additive at least one alcoholate of magnesium, calcium or aluminum. The electric insulation according to the invention is particularly suitable for use in cables and wires.
Inventors
- 👤 Hans-Joachim Henkel
- 👤 Norbert Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:11
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B7/2813; C; C08; C08K; C08K5/00; C08K5/04; C08K5/05; C08K5/057; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31696; Y10T428/31699
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
58 words
An insulated electrical conductor comprising an electrically conducting material in combination with an electrically insulating polyolefin composition containing at least one alcoholate of magnesium, calcium or aluminum as an additive thereto, said additive acting upon said polyolefin composition to prevent the formation of water trees when said composition is dielectrically stressed by the presence of an electric field.
Claim 2
Dependent Claim
58 words
An insulated electrical conductor comprising an electrically conducting material in combination with an electrically insulating polyolefin composition containing at least one alcoholate of magnesium, calcium or aluminum as an additive thereto, said additive acting upon said polyolefin composition to prevent the formation of water trees when said composition is dielectrically stressed by the presence of an electric field.
Claim 3
Dependent Claim
52 words
An insulated electrical conductor according to claim 1 wherein the alcoholate has the formula M(OR) x , M is magnesium, calcium or aluminum; x is 2 when M is magnesium or calcium, x is 3 when M is aluminum; and R is an alkyl of 1 to 24 carbon, cycloalkyl or alkaryl.
Claim 4
Dependent Claim
28 words
A conductor according to claim 1 wherein the concentration of the additive is about 0.05 to about 10% by weight relative to the total weight of the composition.
Claim 5
Dependent Claim
15 words
A conductor according to claim 3 wherein the additive concentration is 0.1% to about 5%.
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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) | 1989-03-03 | 1989-09-02 | 1990-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-03 | 1993-09-02 | 1994-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-03 | 1997-09-02 | 1998-03-04 | $7700.00 | Window Closed / Lapsed |