Patent US3663742A successfully refreshed from Google Patents.
US3663742A
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Method of mitigating sulfide trees in polyolefin insulated conductors
Assignee: Furukawa Electric Co Ltd
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Filing: 1970-10-02
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Granted: 1972-05-16
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Expires: 1990-10-02
Abstract
Abstract In an electric cable provided with a plastic sheath and an insulating layer consisting of polyolefin series resin applied directly or with the aid of other insulating layer on the copper conductor, polyolefin-series resin insulated electric cable provided in a desired position with a sulfide-capture layer consisting of a polyolefin-series resin composition incorporated with such powder of metals, salts of the metals, or the mixture thereof as to form water-insoluble metal sulfides by reacting with water soluble sulfides.
Inventors
- 👤 Morikuni Hasebe
- 👤 Hiroshi Nagai
- 👤 Teruo Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:26
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/308
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
31 words
A method according to claim 1, wherein the material of said polyolefin-series resin insulating layer is selected from the group consisting of high-density polyethylene, medium-density polyethylene, low-density polyethylene and cross-linked polyethylene.
Claim 2
Dependent Claim
18 words
A method according to claim 1, wherein the number of said insulated cable cores are at least three.
Claim 3
Dependent Claim
15 words
A method according to claim 1, wherein said sulfide-capture layer surrounds said insulated cable core.
Claim 4
Dependent Claim
28 words
A method according to claim 1, wherein said sulfide-capture layer is contiguous to at least one side of said polyolefin-series resin insulating layer of said insulated cable core.
Claim 5
Dependent Claim
92 words
A method according to claim 1, wherein the material of said sulfide-capture layer is of a composition consisting of 100 parts by weight of at least one base resin selected from the group consisting of high-density polyethylene, medium-density polyethylene, low-density polyethylene, ethylene-vinylacetate copolymer, ethylene-ethylacrylate copolymer, ionomer, isotactic polypropylene and isotactic polybutene-1 and 5 to 60 parts by metal weight of at least one substance selected from the group consisting of powdery metals salts of said metals, and the mixture thereof capable of reaction with the water-soluble sulfide to produce a water-insoluble sulfide.
Claim 6
Dependent Claim
46 words
A method according to claim 1, wherein the material of said sulfide-capture layer contains at least one substance selected from the group consisting of oxides, hydroxides, sulfates, chlorides, nitrates, carbonates and aliphatic and aromatic organic acid salts of lead, zinc, bismuth, cadmium, copper, iron and tin.
Claim 7
Dependent Claim
73 words
A method according to claim 1, wherein the material of said sulfide-capture layer contains a lead salt selected from the group consisting of lead oxide, lead hydroxide, lead carbonate, lead nitrate, lead chloride, lead acetate, lead sulfate, lead chromate, lead perioxide, red lead, lead sequioxide, white lead, lead stearate, monobasic lead acetate, basic lead silicate, tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate, tribasic lead maleate, lead salicylate and dibasic lead stearate.
Claim 8
Dependent Claim
40 words
A method according to claim 1, wherein the material of said sulfide-capture layer contains a zinc salt selected from the group consisting of zinc oxide, zinc hydroxide, zinc sulfate, zinc chloride, zinc carbonate, zinc stearate, zinc laurate and zinc ricinoleate.
Claim 9
Dependent Claim
36 words
A method according to claim 1, wherein the material of said sulfide-capture layer contains a cadmium salt selected from the group consisting of cadmium sulfate, cadmium chloride, cadmium carbonate, cadmium stearate, cadmium laurate and cadmium ricinoleate.
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |