Patent US4065635A successfully refreshed from Google Patents.
US4065635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical cables insulated with extraction resistant stabilized material
Assignee: Dart Industries Inc
•
Filing: 1975-12-16
•
Granted: 1977-12-27
•
Expires: 1995-12-16
Abstract
Abstract The insulation of electrical cables which are utilized in environments likely to cause extraction of stabilizer systems is achieved through the use of compositions in which a disubstituted alkylhydroxyphenyl alkanoyl hydrazine is used as extraction resistant stabilizer for ethylene-propylene copolymer coating materials. Equivalent nomenclature for the preferred stabilizer is disubstituted di-t-butyl hydroxy hydro cinnamoyl (DTBHC) hydrazine. The DTBHC hydrazine is substantially the only stabilizer used in the stabilized compositions.
Inventors
- 👤 Kornel D. Kiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:37
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B7/2806; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
97 words
In an outer-jacketed electrical cable suitable for use in underground installations and comprising a plurality of metal wires individually encased in an insulating covering having an ethylene-propylene copolymer resin base containing a minor addition of protective stabilizer with said insulating covering being immersed in a high viscosity liquid filler compound based upon petroleum fractions or polyethylene wax, the improvement wherein said protective stabilizer consists essentially of between about 2500 and about 20,000 parts of disubstituted hydrazine chosen from N,N 1 -bis-β-(3,5-di-t-butyl-4-hydroxyphenyl) propionyl-hydrazine and N-stearoyl, N 1 -β-(3,5-di-t-butyl-4-hydroxyphenyl) propionyl-hydrazine per million parts by weight of said ethylene-propylene copolymer.
Claim 2
Dependent Claim
97 words
In an outer-jacketed electrical cable suitable for use in underground installations and comprising a plurality of metal wires individually encased in an insulating covering having an ethylene-propylene copolymer resin base containing a minor addition of protective stabilizer with said insulating covering being immersed in a high viscosity liquid filler compound based upon petroleum fractions or polyethylene wax, the improvement wherein said protective stabilizer consists essentially of between about 2500 and about 20,000 parts of disubstituted hydrazine chosen from N,N 1 -bis-β-(3,5-di-t-butyl-4-hydroxyphenyl) propionyl-hydrazine and N-stearoyl, N 1 -β-(3,5-di-t-butyl-4-hydroxyphenyl) propionyl-hydrazine per million parts by weight of said ethylene-propylene copolymer.
Claim 3
Dependent Claim
16 words
The electrical cable of claim 1 wherein said stabilizer consists essentially of N,N 1 -bis-β-(3,5-di-t-butyl-4-hydroxyphenyl) propionyl-hydrazine.
Claim 4
Dependent Claim
17 words
The electrical cable of claim 1 wherein said stabilizer consists essentially of N-stearoyl, N 1 -β-(3,5-di-t-butyl-4-hydroxyphenyl) propionyl-hydrazine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |