US3566009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-resistant electrical cables
Assignee: Wacker Chemical Corp
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Filing: 1968-10-04
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Granted: 1971-02-23
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Expires: 1988-10-04
Abstract
Abstract The disclosure relates to multiple conductor electrical cables containing room-temperature-curable organopolysiloxanes as valley sealants. The organopolysiloxane may be filled with low density cellular particulate matter having closed or semiclosed cells, such as glass spheres, which will revert to a nonconductive inert organic silica layer when exposed to open flame. The silica layer protects the electrical integrity of the wire even in the advent of a long duration open flame condition.
Inventors
- 👤 Andrew J Lamond
- 👤 Gene Arthur Tyrer
- 👤 Charles George Neuroth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:13
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/16; H01B7/17; H01B7/28; H01B7/282; H01B7/2825; Y; Y02; Y02A; Y02A30/00; Y02A30/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
25 words
The article of claim 1 wherein the silicone rubber valley sealant contains from 1 to 50 percent by weight of low density cellular particulate matter.
Claim 2
Dependent Claim
13 words
The article of claim 2 wherein the particulate matter is hollow glass spheres.
Claim 3
Dependent Claim
121 words
An electrical cable which will maintain its circuit integrity comprising a multiplicity of conductors, each containing a metallic strand, a sealant on said metallic strand, a silicone rubber layer on said strand sealant, a fibrous glass braid on said silicone rubber layer, a lacquer layer on said fibrous glass braid, a room-temperature-cured silicone rubber valley sealant surrounding and intermediate to the multiple conductors, said silicone rubber sealant obtained from the reaction of a hydroxyl-terminated organopolysiloxane, an organic silicate and a curing catalyst and containing up to 2 percent by weight of a flame retardant, a protective layer selected from the class consisting of polytetrafluoroethylene, glass fiber, polyvinylfluoride, polyethylene terphthalate, surrounding said valley sealant, and a metallic sheath covering said protective layer.
Claim 4
Dependent Claim
50 words
The article of claim 1 wherein the silicone rubber comprises a room-temperature-curable hydroxyl-terminated organopolysiloxane of the formula: where R is selected from the class consisting of monovalent hydrocarbon radicals and halogenated hydrocarbon radicals and n has an average value of 1.95 to 2.1, an organic silicate and a curing catalyst.
Claim 5
Dependent Claim
11 words
The article of claim 5 wherein R is a methyl radical.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |