US3576388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical cable
Assignee: Wacker Chemical Corp
•
Filing: 1968-12-05
•
Granted: 1971-04-27
•
Expires: 1988-12-05
Abstract
Abstract The invention relates to a multiple-conductor electrical cable containing a heat-curable cellular or noncellular silicone rubber as valley sealant between the individual conductors. The cellular heat-curable silicone rubber may be foamed in situ prior to curing to form an elastomeric material which will reduce the density of the electrical cable. Should the cable be exposed to an open flame, the cellular or noncellular silicone rubber will revert to a nonconductive inert organic silica layer and thereby protect the electrical integrity of the cable.
Inventors
- 👤 Carl Newton Bruns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:00
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/28; H01B3/30; H01B3/46; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/2825; H01B7/285; Y; Y02; Y02A; Y02A30/00; Y02A30/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
14 words
The article of claim 1 Wherein the valley sealant is a foamed silicone rubber.
Claim 2
Dependent Claim
24 words
The article of claim 1 wherein the silicone rubber contains from 1 percent to 50 percent by weight of low density cellular particulate matter.
Claim 3
Dependent Claim
13 words
The article of claim 3 wherein the particulate matter is hollow glass spheres.
Claim 4
Dependent Claim
25 words
The article of claim 1 wherein the heat-cured silicone rubber comprises a methyl vinyl polysiloxane polymer having a viscosity between 250,000 centistokes and 400,000 centistokes.
Claim 5
Dependent Claim
21 words
The article of claim 1 wherein the antistructuring agent is a hydroxyl-terminated dimethylpolysiloxane having a viscosity between 40 and 100 centistokes.
Claim 6
Dependent Claim
44 words
The composition of claim 1 wherein the metallic conductors contain a metallic strand, a sealant on said metallic strand, a silicone rubber on said strand sealant, a fibrous glass braid on said silicone rubber layer and a lacquer layer on said fibrous glass braid.
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |