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US3900701A Expired / Lapsed US ⏱️ 0.0 years remaining

High temperature electrical cable

Assignee: 555794 ONTARIO Inc
•
Filing: 1974-07-15
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Granted: 1975-08-19
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Expires: 1994-07-15
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Abstract

Abstract A high temperature electrical cable comprising generally three parts is disclosed, namely a central conductor, a covering of insulating material applied over the central conductor and an outer protective sleeving applied over the covering of insulating material. The central conductor is made of stranded or solid metal capable of essentially maintaining its useful service at high temperature. The covering of insulating material consists of at least one inner layer of inorganic high temperature material providing essentially complete coverage of the conductor and a smooth base for the subsequent layers, at least two layers of primary dielectric material consisting of mica tapes made from reconstituted mica sheets impregnated with carborane siloxane polymers, and an outer layer of inorganic high temperature material over the mica tapes such as to provide essentially complete coverage of the primary dielectric layers. The outer protective sleeving is achieved either by knitting or braiding one or more fine high temperature resistant wires onto the covering of insulating material.

Inventors

  • 👤 Francis Derrick Bayles
  • 👤 Michael Alan Dudley
  • 👤 John C Metzler

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 11:57
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/29; H01B7/292

Claims Analysis

Total Claims: 20
Claim 1
Independent Claim 133 words
A HIGH TEMPERATURE ELECTRICAL CABLE COMPRISING: A. A CENTRAL CONDUCTOR MADE OF A METAL CAPABLE OF ESSENTIALLY MAINTAINING ITS USEFUL SERVICE AT HIGH TEMPERATURES, B. A COVERING OF ELECTRICAL INSULATING MATERIAL APPLIED OVER SAID CONDUCTOR AND CONSISTING OF AT LEAST ONE INNER LAYER OF INORGANIC HIGH TEMPERATURE MATERIAL PROVIDING ESSENTIALLY COMPLETE COVERAGE OF SAID CONDUCTOR AND A SMOOTH BASE FOR SUBSEQUENT LAYERS, AT LEAST TWO LAYERS OF PRIMARY DIELECTRIC MATERIAL CONSISTING OF IMPREGNATED MICA TAPES MADE OF RECONSTITUTED MICA SHEETS IMPREGNATED WITH CARBONANE SILOXANE POLYMERS, AND AT LEAST ONE OUTER LAYER OF INORGANIC HIGH TEMPERATURE MATERIAL OVER SAID IMPREGNATED MICA TAPES, AND C. AN OUTER LAYER PROTECTIVE SLEEVING APPLIED BY KNITTING OR BRAIDING OVER SAID OUTER LAYER OF INORGANIC HIGH TEMPERATURE MATERIAL AND CONSISTING OF AT LEAST ONE HIGH TEMPERATURE RESISTANT METAL WIRE.
Claim 2
Dependent Claim 133 words
A HIGH TEMPERATURE ELECTRICAL CABLE COMPRISING: A. A CENTRAL CONDUCTOR MADE OF A METAL CAPABLE OF ESSENTIALLY MAINTAINING ITS USEFUL SERVICE AT HIGH TEMPERATURES, B. A COVERING OF ELECTRICAL INSULATING MATERIAL APPLIED OVER SAID CONDUCTOR AND CONSISTING OF AT LEAST ONE INNER LAYER OF INORGANIC HIGH TEMPERATURE MATERIAL PROVIDING ESSENTIALLY COMPLETE COVERAGE OF SAID CONDUCTOR AND A SMOOTH BASE FOR SUBSEQUENT LAYERS, AT LEAST TWO LAYERS OF PRIMARY DIELECTRIC MATERIAL CONSISTING OF IMPREGNATED MICA TAPES MADE OF RECONSTITUTED MICA SHEETS IMPREGNATED WITH CARBONANE SILOXANE POLYMERS, AND AT LEAST ONE OUTER LAYER OF INORGANIC HIGH TEMPERATURE MATERIAL OVER SAID IMPREGNATED MICA TAPES, AND C. AN OUTER LAYER PROTECTIVE SLEEVING APPLIED BY KNITTING OR BRAIDING OVER SAID OUTER LAYER OF INORGANIC HIGH TEMPERATURE MATERIAL AND CONSISTING OF AT LEAST ONE HIGH TEMPERATURE RESISTANT METAL WIRE.
Claim 3
Dependent Claim 19 words
A high temperature electrical cable as defined in claim 1, wherein the central conductor is made of solid metal.
Claim 4
Dependent Claim 21 words
A high temperature electrical cable as defined in claim 1, wherein the central conductor is made of plural strands of metal.
Claim 5
Dependent Claim 25 words
A high temperature electrical cable as defined in claim 1, wherein the central conductor consists of a central metal core cladded with a dissimilar metal.
Claim 6
Dependent Claim 46 words
A high temperature electrical cable as defined in claim 4, wherein the central conductor is made of a metal selected from the class of metal consisting of nickel clad copper, nickel clad silver, nickel alloy clad copper, nickel alloy clad silver and stainless steel clad copper.
Claim 7
Dependent Claim 18 words
A high temperature electrical cable as defined in claim 1, wherein the central conductor is made of rhodium.
Claim 8
Dependent Claim 45 words
A high temperature electrical cable as defined in claim 1, wherein the conductor consists of a silver core protected by a nickel alloy sheath representing a cross-sectional area for the sheath of between 25 and 50 percent of the total cross-section area of the conductor.
Claim 9
Dependent Claim 37 words
A high temperature electrical cable as defined in claim 7, wherein the nickel alloy sheath represents a cross-sectional area for the sheath of preferably between 40 and 50 percent of the total cross-section area of the conductor.
Claim 10
Dependent Claim 44 words
A high temperature electrical cable as defined in claim 1, wherein the inner and outer layers of inorganic high temperature material are made of braided fibers selected from the group consisting of quartz, leached glass, boron free glass and the like and combinations thereof.
Claim 11
Dependent Claim 35 words
A high temperature electrical cable as defined in claim 1, wherein the impregnated mica tapes are reinforced with a backing of fibers applied as unidirectional thread or woven construction and impregnated with a polymeric material.
Claim 12
Dependent Claim 34 words
A high temperature electrical cable as defined in claim 10, wherein the polymeric material used for impregnation of the backing may be selected from the group consisting of carborane siloxane polymers and poly (siloxanes).
Claim 13
Dependent Claim 26 words
A high temperature electrical cable as defined in claim 1, wherein the impregnated mica tapes are made of reconstituted mica sheets impregnated with decarborane siloxane polymers.
Claim 14
Dependent Claim 25 words
A high temperature electrical cable as defined in claim 1, wherein the impregnated tapes are made of reconstituted mica sheets impregnated with pentaborane siloxane polymers.
Claim 15
Dependent Claim 28 words
A high temperature electrical cable as defined in claim 1, wherein the impregnated mica tapes are made of reconstituted mica sheets impregnated with mixed meta-and para-decarborane siloxane polymers.
Claim 16
Dependent Claim 29 words
A high temperature electrical cable as defined in claim 1, wherein the impregnated mica tapes are made of reconstituted mica sheets impregnated with copolymers of deca- and penta-borane siloxane.
Claim 17
Dependent Claim 31 words
A high temperature electrical cable as defined in claim 1, wherein the impregnated mica tapes are made of reconstituted mica sheets impregnated with physical combinations of deca- and penta-borane siloxane polymers.
Claim 18
Dependent Claim 54 words
A high temperature electrical cable as defined in claim 1, wherein the impregnated mica tapes are applied as lapped, open helically wound tapes applied in the same or opposite lay in the different layers in order to give essentially complete coverage of the wire and a functional dielectric strength of 1,000 volts or more.
Claim 19
Dependent Claim 30 words
A high temperature electrical cable as defined in claim 1, wherein the metallic wires of the outer sleeving are selected from the group consisting of stainless steel and nickel alloys.
Claim 20
Dependent Claim 80 words
A high temperature electrical cable as defined in claim 1, wherein the central conductor is made of nickeL alloy clad silver, the inner and outer layers of inorganic high temperature insulative material made of braided fibers, the primary dielectric layers made of lapped open helically wound tapes of reconstituted mica sheets impregnated with cured carborane siloxane polymers to approximately 10 percent weight loading on weight of mica tapes, and the protective sleeving made of nickel alloy high temperature resistant wire.

References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-08-18 1979-02-17 1979-08-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-08-18 1983-02-17 1983-08-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-08-18 1987-02-17 1987-08-19 $7700.00 Window Closed / Lapsed

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