Patent US3607487A successfully refreshed from Google Patents.
US3607487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waterproof electrical cable
Assignee: AT&T Inc
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Filing: 1968-12-02
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Granted: 1971-09-21
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Expires: 1988-12-02
Abstract
Abstract An electrical communications cable having a plurality of insulated conductors is made waterproof by filling the intersticial spaces with a heated mixture of 85 percent petroleum jelly and 15 percent low-density polyethylene and cooling the mixture.
Inventors
- 👤 Merle C Biskeborn
- 👤 Joseph P Mccann
- 👤 Raffaele A Sabia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:15
CPC Classifications
H; H01; H01B; H01B11/00; H01B13/00; H01B13/32; H01B13/322; H01B13/328; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/285
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
37 words
The method of claim 1 wherein said applying step occurs when said conductors are mutually separated, and comprising the further step of cooling the mixture surrounding said strand at a rate of substantially 60* C. per minute.
Claim 2
Dependent Claim
24 words
The method of claim 2, wherein said insulative material is polypropylene and said applying step occurs while said pairs are being twisted and stranded.
Claim 3
Dependent Claim
65 words
The method of claim 3 comprising the further steps of forming a binder about the gathered conductors, applying additional mixture around the binder, applying a core wrap around the binder, applying additional mixture around the core wrap, applying on outer jacket around said last-named additional mixture, and water cooling the thus-formed cable, whereby all interstitial spaces within said outer jacket are filled with said mixture.
Claim 4
Dependent Claim
45 words
The method of claim 4 wherein said mixture is 85 percent petroleum jelly, and 15 percent polyethylene of a melt index of 250, a density of .926 and a weighted average molecular weight sufficiently high to render said polyethylene amenable to powder or pellet form.
Claim 5
Dependent Claim
22 words
The method of claim 5 wherein said mixture has a dielectric constant substantially equal to the dielectric constant of said polypropylene insulation.
Claim 6
Dependent Claim
88 words
In the manufacture of multipair telephone cable having conductors insulated with a material selected from the group consisting of polyethylene and polypropylene, the steps comprising: applying a mixture comprising 80 to 97 percent petroleum jelly with 20 to 3 percent polyethylene around pairs of said insulated conductors, said polyethylene having a weight average molecular weight of at least 40,000 and said mixture being heated to a temperature above its melting point but below that of said insulative material; and gathering said pairs together while enveloped with said mixture.
Claim 7
Dependent Claim
89 words
In the manufacture of multipair telephone cable having conductors insulated with a material selected from the group consisting of polyethylene and polypropylene, the steps comprising: applying a mixture comprising 87 to 99 percent petroleum jelly and 13 to 1 percent polypropylene around pairs of said insulated conductors, sand polypropylene in said mixture having a weight average molecular weight between 100,000 and 350,000, said mixture beiNg at a temperature above its melting point but below that on said conductor insulation; and gathering said pairs together while enveloped with said mixture.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |