US4220179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spacer for coaxial tube systems
Assignee: KM Kabelmetal AG
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Filing: 1979-02-21
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Granted: 1980-09-02
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Expires: 1999-02-21
Abstract
Abstract Spacer for concentrically disposed tube systems where a temperature drop exists between adjacent tubes. This may consist, for example, of a superconducting electric cable or alternatively of a tube system for carrying heated liquid or gaseous media. The concentric tubes are spaced by a winder which touches the surfaces of adjacent tubes at particular points and which consists of two ribbons of insulating material disposed adjacent to each other having two elements in-between, and one of them being wound about the other so that they touch adjacent ribbon surfaces only in isolated points.
Inventors
- 👤 Ernst Scheffler
- 👤 Friedrich Schatz
- 👤 Gerhard Ziemek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:43
CPC Classifications
H; H01; H01B; H01B12/00; H01B12/14; F; F16; F16L; F16L59/00; F16L59/12; F16L59/125; Y; Y02; Y02E; Y02E40/00; Y02E40/60; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/883; Y10S505/884; Y10S505/885; Y10S505/886
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
A coaxial tube system, including a helical spacer for spacing an inner tube of the system from another tube thereof in coaxial relation, there being a temperature gradient between the tubes, the helical spacer comprising an assembly of a plurality of flat, elongated, superposed, relatively narrow elements, including a first and a second ribbon; a third, elongated element disposed between the first and the second ribbon; and a filament element helically looped around the third element, but not around the first and second ribbon, so that the third element and the filament are held between the first and second ribbons, the assembly as a whole being helically placed on said inner tube.
Claim 2
Dependent Claim
112 words
A coaxial tube system, including a helical spacer for spacing an inner tube of the system from another tube thereof in coaxial relation, there being a temperature gradient between the tubes, the helical spacer comprising an assembly of a plurality of flat, elongated, superposed, relatively narrow elements, including a first and a second ribbon; a third, elongated element disposed between the first and the second ribbon; and a filament element helically looped around the third element, but not around the first and second ribbon, so that the third element and the filament are held between the first and second ribbons, the assembly as a whole being helically placed on said inner tube.
Claim 3
Dependent Claim
19 words
Spacer as in claim 1, said elongated element being another filament element, the filaments being stranded about each other.
Claim 4
Dependent Claim
20 words
Spacer as in claim 1, said elongated element being a flat strip, the filament being helical wound about the element.
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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) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |