US3671663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive thermoplastic composition useful for high tension cables
Assignee: Huels AG
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Filing: 1970-03-25
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Granted: 1972-06-20
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Expires: 1990-03-25
Abstract
Abstract The invention relates to electrically conductive thermoplastic compositions suitable for use as intermediate layers in high tension cables having an outer insulating layer comprising poly (butene-1). The composition comprises stated amounts of isotactic poly (butene-1), amorphous and/or atactic thermoplastic compositions, and an electrically conductive carbon black.
Inventors
- 👤 Friedrich Seifert
- 👤 Josef Bittscheidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:15
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08L; C08L23/00; C08L23/02; C08L23/18; C08L23/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
14 words
The electric cable of claim 1 wherein said thermoplastic material is atactic poly (butene-1).
Claim 2
Dependent Claim
13 words
The electric cable of claim 1 wherein said thermoplastic material is atactic pOlypropylene.
Claim 3
Dependent Claim
13 words
The electric cable of claim 1 wherein said thermoplastic material is ethylene-propylene rubber.
Claim 4
Dependent Claim
12 words
The electric cable of claim 1 wherein said thermoplastic material is polyisobutylene.
Claim 5
Dependent Claim
13 words
The electric cable of claim 1 wherein said carbon black is acetylene black.
Claim 6
Dependent Claim
13 words
The electric cable of claim 1 wherein said carbon black is furnace black.
Claim 7
Dependent Claim
76 words
The electric cable of claim 1 wherein the conductive carbon black is an acetylene black having an average particle size of 30-60 m Mu , a specific surface area of 95-53 m2/g and is not more than 1 percent by weight of volatile components, or a furnace black having an average particle size of 20-29 m Mu , a specific surface area of 140-85 m2/g, and not more than 2 percent by weight of volatile components.
Claim 8
Dependent Claim
31 words
The electric cable of claim 1 wherein said layer surrounding said core comprises 40-48 percent of isotactic poly(butene-1), 23-27 percent of said thermoplastic material, and 29-33 percent of said carbon black.
Claim 9
Dependent Claim
27 words
An electric cable as defined by claim 1, further comprising a second and outer layer enveloping said surrounding layer, said second outer layer comprising partially crystalline poly(butene-1).
Claim 10
Dependent Claim
27 words
An electric cable as defined by claim 8, further comprising a second and outer layer enveloping said surrounding layer, said second outer layer comprising partially crystalline poly(butene-1).
References Cited (Backward Citations)
CA508338A
Cited
US2512459A
Cited
US2597741A
Cited
US2830919A
Cited
GB842479A
Cited
US3096210A
Cited
US3517086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |