US4241233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming dielectric material for electrical cable and resulting structure
Assignee: Electric Power Research Institute
•
Filing: 1978-07-26
•
Granted: 1980-12-23
•
Expires: 1998-07-26
Abstract
Abstract A cable such as used in cryogenic and superconductive applications includes an inner conductor, an outer conductor or shield, and a solid dielectric between the inner and outer conductors. The dielectric is introduced into the space between conductors in liquid or gaseous form, preferably under pressure, and the temperature of the dielectric is lowered to or below the freezing point for the material. Pressure relief should the solid dielectric suddenly vaporize by rapid heat rise is provided by holes in the outer conductor or by scoring the inner surface of the outer conductor to provide rupture points in the conductor.
Inventors
- 👤 George Bahder
- 👤 Mario Rabinowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:35
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/16; H01B13/00; H01B13/06; H01B13/067; H01B13/30; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/884; Y10S505/885; Y10S505/886
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
54 words
The method of forming a solid dielectric material between conductors of a coaxial cable, comprising the steps of: filling the space between conductors with a dielectric material in fluid form, and lowering the temperature of said dielectric material below the solidification point of said material with a temperature gradient whereby said fluid solidifies outwardly.
Claim 2
Independent Claim
54 words
The method of forming a solid dielectric material between conductors of a coaxial cable, comprising the steps of: filling the space between conductors with a dielectric material in fluid form, and lowering the temperature of said dielectric material below the solidification point of said material with a temperature gradient whereby said fluid solidifies outwardly.
Claim 3
Dependent Claim
31 words
The method defined by claim 1 wherein the inner conductor of said coaxial cable is hollow and the step of lowering the temperature includes passing a coolant through said inner conductor.
Claim 4
Dependent Claim
27 words
The method defined by claim 2 wherein the step of filling said space with dielectric material includes applying pressure to said dielectric material to minimize void formation.
Claim 5
Dependent Claim
12 words
The method defined by claim 2 wherein said coolant is a cryogen.
Claim 6
Dependent Claim
68 words
The method defined by claim 2 wherein said coaxial cable is provided within a cryogenic envelope and said outer conductor includes a plurality of holes through its surface, and said step of filling includes filling the space within said cryogenic envelope with said dielectric material and further including the step of removing excess liquid material from said cryogenic envelope after the dielectric material within said coaxial cable solidifies.
Claim 7
Dependent Claim
35 words
The method defined by claim 5 wherein the step of filling space in said coaxial cable and in said cryogenic envelope with dielectric material includes applying pressure to said dielectric material to minimize void formation.
Claim 8
Dependent Claim
12 words
The method defined by claim 1 wherein said fluid is a liquid.
Claim 9
Dependent Claim
22 words
The method defined by claim 5 wherein dielectric material is formed within a plurality of coaxial cables provided within said cryogenic envelope.
Claim 10
Independent Claim
57 words
The method of forming a solid dielectric material between conductors of a coaxial cable comprising the steps of: passing a dielectric material in gaseous form through said coaxial cable between said conductors, and cooling said gaseous dielectric material until a solid dielectric material is formed beginning at said inner conductor and extending outwardly to said outer conductor.
Claim 11
Independent Claim
57 words
The method of forming a solid dielectric material between conductors of a coaxial cable comprising the steps of: passing a dielectric material in gaseous form through said coaxial cable between said conductors, and cooling said gaseous dielectric material until a solid dielectric material is formed beginning at said inner conductor and extending outwardly to said outer conductor.
Claim 12
Dependent Claim
32 words
The method defined by claim 8 wherein the inner conductor of said coaxial cable is hollow and wherein the step of lowering the temperature includes passing a coolant through said inner conductor.
Claim 13
Dependent Claim
12 words
The method defined by claim 9 wherein said coolant is a cryogen.
References Cited (Backward Citations)
GB1212256A
Cited
DE2431212A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |