Patent US4238638A successfully refreshed from Google Patents.
US4238638A
Expired / Lapsed
US
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Electric cable
Assignee: Phillips Cables Ltd
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Filing: 1978-12-08
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Granted: 1980-12-09
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Expires: 1998-12-08
Abstract
Abstract An electric cable having a core made of insulated conductors disposed within a polymeric sheath. Voids within the core, between the conductors, are at least partially filled in the unused cable with a mixture comprising untreated calcium carbonate and a water-attracting polymer able to form a gel on contact with water without swelling. The cables are made waterproof by the presence of the mixture, which is cheaper than prior mixtures but as effective.
Inventors
- 👤 Donald F. Cretney
- 👤 John Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:57
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/285; Y; Y02; Y02A; Y02A30/00; Y02A30/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
In an electrical cable having a core made of insulated conductors disposed within a polymeric sheath wherein the improvement comprises at least partially filling the voids within the core, between the conductors, in the unused cable with a mixture comprising: untreated calcium carbonate; and a water-attracting polymer able to form a gel on contact with water without swelling comprising hydroxyethyl cellulose.
Claim 2
Dependent Claim
61 words
In an electrical cable having a core made of insulated conductors disposed within a polymeric sheath wherein the improvement comprises at least partially filling the voids within the core, between the conductors, in the unused cable with a mixture comprising: untreated calcium carbonate; and a water-attracting polymer able to form a gel on contact with water without swelling comprising hydroxyethyl cellulose.
Claim 3
Dependent Claim
34 words
A cable as claimed in claim 1 in which the hydroxyethyl cellulose is first subjected to a treatment comprising keeping the compound at a temperature greater than 100° C. for at least three hours.
Claim 4
Dependent Claim
22 words
A cable as claimed in claim 2 in which the treatment comprises heating the hydroxyethyl cellulose at 105° C. for three hours.
Claim 5
Dependent Claim
70 words
In an electrical cable having a core made up of insulated conductors disposed within a polymeric sheath wherein the improvement comprises at least partially filling the voids in the core, between the conductors, with a mixture comprising untreated calcium carbonate and hydroxyethyl cellulose and in which the hydroxyethyl cellulose has first been subjected to heating at a temperature greater than 100° C. for a period of at least three hours.
Claim 6
Dependent Claim
70 words
In an electrical cable having a core made up of insulated conductors disposed within a polymeric sheath wherein the improvement comprises at least partially filling the voids in the core, between the conductors, with a mixture comprising untreated calcium carbonate and hydroxyethyl cellulose and in which the hydroxyethyl cellulose has first been subjected to heating at a temperature greater than 100° C. for a period of at least three hours.
Claim 7
Dependent Claim
22 words
A cable as claimed in claim 4 in which the treatment comprises heating the hydroxyethyl cellulose at 105° C. for three hours.
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) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |