US4004077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water blocked electric cables
Assignee: Nortel Networks Ltd
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Filing: 1975-03-07
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Granted: 1977-01-18
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Expires: 1995-03-07
Abstract
Abstract An electric cable having a multi-stranded core and a jacket, in which the voids between and around the core are at least partially filled with a mixture of a hydrophobic powder and a hydrophilic powder. The hydrophobic powder may be coated calcium carbonate and a hydrophilic powder may be polyacrylamide, in which case the polyacrylamide should be between 8% and 30% by weight of the mixture. Preferably the individual conductors are coated with a hydrophobic oil such as a low viscosity paraffinic oil.
Inventors
- 👤 Leo Victor Woytiuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:21
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/285; H01B7/288; Y; Y02; Y02A; Y02A30/00; Y02A30/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
59 words
An electric cable having a core of a plurality of conductors and a jacket, the interstices between the conductors and within the jacket being at least partially filled with a mixture of a hydrophobic and a hydrophilic powder, the hydrophilic powder forming on contact with water a viscous, non-swelling material, the conductors being each coated with a hydrophobic oil.
Claim 2
Dependent Claim
59 words
An electric cable having a core of a plurality of conductors and a jacket, the interstices between the conductors and within the jacket being at least partially filled with a mixture of a hydrophobic and a hydrophilic powder, the hydrophilic powder forming on contact with water a viscous, non-swelling material, the conductors being each coated with a hydrophobic oil.
Claim 3
Dependent Claim
18 words
A cable as claimed in claim 1 in which the hydrophobic oil is a low viscosity paraffinic oil.
References Cited (Backward Citations)
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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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |