Patent US4308416A successfully refreshed from Google Patents.
US4308416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-tight electric cable
Assignee: Elementis Specialties Inc
•
Filing: 1980-12-17
•
Granted: 1981-12-29
•
Expires: 2000-12-17
Abstract
Abstract Insulated electrical devices protected against entry and migration of water, said electrical devices containing solid water-swellable, water-insoluble polymers prepared by crosslinking an olefinically-unsaturated carboxylic acid with an alkyl acrylate.
Inventors
- 👤 Daniel F. Herman
- 👤 Uno Kruse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:31
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/285; H01B7/288; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/2933; Y10T428/2936; Y10T428/2938; Y10T428/294; Y10T428/2942; Y10T428/2947
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
130 words
An electric cable having a core of a plurality of insulated conductors and a jacket, the area between the conductors and within the jacket being at least partially filled with a particulate water-swellable, water-insoluble polymer which comprises: (a) from about 15% to about 50% by weight of an olefinically-unsaturated carboxylic acid containing an activated carbon-to-carbon olefinic double bond and at least one carboxy group; (b) from about 49.07% to about 82% by weight of an alkyl acrylate wherein the alkyl group has from 1 to 6 carbon atoms; and (c) from about 0.03% to about 3.0% by weight of a crosslinking agent which are polyunsaturated polymerizable vinyl monomers containing two or more free radical polymerizable ethylenic groups, said crosslinking agent being introduced directly into the carbon-carbon backbone of the polymer.
Claim 2
Dependent Claim
130 words
An electric cable having a core of a plurality of insulated conductors and a jacket, the area between the conductors and within the jacket being at least partially filled with a particulate water-swellable, water-insoluble polymer which comprises: (a) from about 15% to about 50% by weight of an olefinically-unsaturated carboxylic acid containing an activated carbon-to-carbon olefinic double bond and at least one carboxy group; (b) from about 49.07% to about 82% by weight of an alkyl acrylate wherein the alkyl group has from 1 to 6 carbon atoms; and (c) from about 0.03% to about 3.0% by weight of a crosslinking agent which are polyunsaturated polymerizable vinyl monomers containing two or more free radical polymerizable ethylenic groups, said crosslinking agent being introduced directly into the carbon-carbon backbone of the polymer.
Claim 3
Dependent Claim
70 words
The electrical cable of claim 1 in which the polymer comprises from about 20% to about 40% by weight of the olefinically-unsaturated carboxylic acid selected from the group consisting of methacrylic acid and acrylic acid; from about 59.02% to about 78% by weight of an alkyl acrylate selected from the group consisting of methyl acrylate, ethyl acrylate and n-butyl acrylate; and about 0.08% to about 2% by weight crosslinking agent.
Claim 4
Dependent Claim
31 words
The electrical cable of claim 1 wherein the polymer is contained in an absorbent wrapping comprising an absorbent layer containing up to 90% by weight of said particulate water-swellable, water-insoluble polymer.
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) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |