US3909555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase stable transmission cable with controlled thermal expansion characteristics
Assignee: Kaman Sciences Corp
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Filing: 1974-10-16
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Granted: 1975-09-30
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Expires: 1994-10-16
Abstract
Abstract A cable for high frequency use in an environment with high and varying thermal changes whereby the thermal expansion of the cable is controlled by having a highly electrically conductive metal bonded to a metal of low coefficient of thermal expansion relative to the high electrically conductive metal. This is accomplished by providing a thin layer of highly electrically conductive metal over an inner core of a metal of low coefficient of thermal expansion. The cable can also utilize a similar bonded metal configuration for an outer concentric conductive sheath having a mineral dielectric between conductors that also has a low coefficient of thermal expansion.
Inventors
- 👤 Dewey F Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:00
CPC Classifications
H; H01; H01B; H01B11/00; H01B11/18; H01B11/1808; H01B7/00; H01B7/17; H01B7/18; H01B7/22; H01B7/221
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
111 words
A HIGH TEMPERATURE ELECTRICAL LENGTH STABLE RADIO FREQUENCY CABLE COMPRISING A CENTER CONDUCTOR A SPACED CONCENTRIC CONDUCTIVE SHEATH AND A DIELECTRIC INSULATING MEDIUM BETWEEN SAID SHEATH AND CENTER CONDUCTOR WHEREIN THE CENTER CONDUCTOR IS COMPRISED OF A CORE OF A METAL ALLOY OF LOW COEFFEICIENT OF THERMAL EXPANSION WITH A RELATIVELY THIN OUTER LAYER OF LOW ELECTRICAL RESISTIVLY METAL BONDED THERETO AND SHEATH COMPRISES A HOLLOW TUBULAR MEMBER OF A METAL OR METAL ALLOY OF LOW COEFFICIENT OF THERMAL EXPASION WITH A RELATIVELY THIN BONDED OF LOW ELECTRICAL RESISTVITY METAL BONDED TO THE INSIDE THEREOF AND WHEREIN THE DIELECTRIC MATERIAL IS SELECTED FROM THE GROUP CONSISTING OF SILICA MAGNESIA AND ALUMINA.
Claim 2
Dependent Claim
111 words
A HIGH TEMPERATURE ELECTRICAL LENGTH STABLE RADIO FREQUENCY CABLE COMPRISING A CENTER CONDUCTOR A SPACED CONCENTRIC CONDUCTIVE SHEATH AND A DIELECTRIC INSULATING MEDIUM BETWEEN SAID SHEATH AND CENTER CONDUCTOR WHEREIN THE CENTER CONDUCTOR IS COMPRISED OF A CORE OF A METAL ALLOY OF LOW COEFFEICIENT OF THERMAL EXPANSION WITH A RELATIVELY THIN OUTER LAYER OF LOW ELECTRICAL RESISTIVLY METAL BONDED THERETO AND SHEATH COMPRISES A HOLLOW TUBULAR MEMBER OF A METAL OR METAL ALLOY OF LOW COEFFICIENT OF THERMAL EXPASION WITH A RELATIVELY THIN BONDED OF LOW ELECTRICAL RESISTVITY METAL BONDED TO THE INSIDE THEREOF AND WHEREIN THE DIELECTRIC MATERIAL IS SELECTED FROM THE GROUP CONSISTING OF SILICA MAGNESIA AND ALUMINA.
Claim 3
Dependent Claim
20 words
The cable of claim 1 wherein the bond between the center conductor and the outer layer is a metallurgical bond.
Claim 4
Dependent Claim
19 words
The cable of claim 1 wherein the bond between the sheath and the inner layer is a metallurgical bond.
Claim 5
Dependent Claim
35 words
The cable of claim 1 wherein the bond between the core and its outer layer is such that the resulting thermal expansion characteristics thereof are that of the low thermal expansion metal and metal alloy.
Claim 6
Dependent Claim
35 words
The cable of claim 1 wherein the bond between the sheath and its inner layer is such that the resulting thermal expansion charactistics thereof are that of the low thermal expansion metal and metal alloy.
Claim 7
Dependent Claim
12 words
The cable of claim 1 wherein the dielectric medium is pure silica.
Claim 8
Dependent Claim
28 words
The cable of claim 1 wherein the low coefficient of thermal expansion metal and metal alloy is selected from the group consisting of iron-nickel-cobalt alloys, molybdenum and tungsten.
Claim 9
Dependent Claim
21 words
The cable of claim 1 wherein the low electrical resistivity metals are selected from the group consisting of silver, and copper.
Claim 10
Dependent Claim
80 words
A high temperature electrical length stable radio frequency cable comprising a center conductor, a spaced concentric conductive sheath and a dielectric insulating medium between said sheath and the center conductor wherein the center conductor is comprised of a core of a metal or metal alloy of low coefficient of thermal expansion with a relatively thin outer layer of low electrical resistivity metal bonded thereto and wherein the dielectric material is selected from the group consisting of silica, magnesia and alumina.
Claim 11
Dependent Claim
80 words
A high temperature electrical length stable radio frequency cable comprising a center conductor, a spaced concentric conductive sheath and a dielectric insulating medium between said sheath and the center conductor wherein the center conductor is comprised of a core of a metal or metal alloy of low coefficient of thermal expansion with a relatively thin outer layer of low electrical resistivity metal bonded thereto and wherein the dielectric material is selected from the group consisting of silica, magnesia and alumina.
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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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |