US3879575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulating compound and closure
Assignee: AT&T Inc
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Filing: 1974-02-21
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Granted: 1975-04-22
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Expires: 1994-02-21
Abstract
Abstract Articles, and particular telephone splices, are protectively encased in a material consisting of a low viscosity oil gelled by a block copolymer such as styrene-iosprene-styrene. Addition of polyethylene to the blend reduces the yield shear stress in the gelled compound and also advantageously supplies a desirable high temperature property of nonslump. Component ranges are described. Stratifying the compound within the closure so that the portion contacting splices is soft and plastic while the remainder is stiff and hard, meets a stringent encasement requirement while minimizing oil separation at high operating temperatures.
Inventors
- 👤 Donald Patrick Dobbin
- 👤 Charles Anthony Fritsch
- 👤 Raffaele Antonio Sabia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:16
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/08; H02G15/10; H02G15/117; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4439; G02B6/444; G02B6/4441; G02B6/4446; G02B6/4447; H02G15/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
54 words
In combination: a plurality of insulated conductor splice points enveloped in a waterproof encapsulating agent comprising from 84.5 to 92.5 parts by weight of mineral oil, from 0.5 to 3.0 parts by weight styrene-isoprene-styrene block copolymer, and from 6.0 to 13.0 parts by weight of polyethylene having a weight average molecular weight above 2000.
Claim 2
Dependent Claim
54 words
In combination: a plurality of insulated conductor splice points enveloped in a waterproof encapsulating agent comprising from 84.5 to 92.5 parts by weight of mineral oil, from 0.5 to 3.0 parts by weight styrene-isoprene-styrene block copolymer, and from 6.0 to 13.0 parts by weight of polyethylene having a weight average molecular weight above 2000.
Claim 3
Dependent Claim
54 words
In combination: a plurality of insulated conductor splice points enveloped in a waterproof encapsulating agent comprising from 84.5 to 92.5 parts by weight of mineral oil, from 0.5 to 3.0 parts by weight styrene-isoprene-styrene block copolymer, and from 6.0 to 13.0 parts by weight of polyethylene having a weight average molecular weight above 2000.
Claim 4
Dependent Claim
54 words
In combination: a plurality of insulated conductor splice points enveloped in a waterproof encapsulating agent comprising from 84.5 to 92.5 parts by weight of mineral oil, from 0.5 to 3.0 parts by weight styrene-isoprene-styrene block copolymer, and from 6.0 to 13.0 parts by weight of polyethylene having a weight average molecular weight above 2000.
Claim 5
Dependent Claim
94 words
A closure receiving and encapsulating therein a plurality of spliced insulated conductors, comprising: a lower shell and an upper shell mating along extended flat edge portions and each shell having a recess, a plurality of spliced electrical conductors disposed between said shells the recess of each said shell containing an encapsulating agent enveloping said splicid electrical conductors, and comprising a blend of from 84.5 to 92.5 parts by weight of mineral oil, from 0.5 to 3.0 parts by weight of styrene-isoprene-styrene block copolymer, and from 6.0 to 13.25 parts by weight of a polyolefin.
Claim 6
Dependent Claim
94 words
A closure receiving and encapsulating therein a plurality of spliced insulated conductors, comprising: a lower shell and an upper shell mating along extended flat edge portions and each shell having a recess, a plurality of spliced electrical conductors disposed between said shells the recess of each said shell containing an encapsulating agent enveloping said splicid electrical conductors, and comprising a blend of from 84.5 to 92.5 parts by weight of mineral oil, from 0.5 to 3.0 parts by weight of styrene-isoprene-styrene block copolymer, and from 6.0 to 13.25 parts by weight of a polyolefin.
Claim 7
Dependent Claim
25 words
A closure pursuant to claim 2, further comprising elongated clip means fastening said upper and said lower shells together along their respective extended edge portions.
Claim 8
Dependent Claim
54 words
A closure pursuant to claim 3, wherein the parts by weight of said mineral oil are in the range of 84.5 to 87.0, the parts by weight of said styrene-isoprene-styrene block copolymer are in the range 1.5 to 3.0, and the parts by weight of said polyolefIn are in the range 10.0 to 13.25.
Claim 9
Dependent Claim
67 words
A closure pursuant to claim 4 wherein said agent condained in each said mating shell is stratified into a first layer contacting said electrical splices, and a second layer filling the remainder of said shell, said first layer adapted to be rendered relatively soft by subjecting the some to shearing motion and said second layer being relatively rigid providing stiff support and protection for said first layer.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |