US3693648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duct system for low-temperature fluids and thermally isolated electrical conductors
Assignee: Forschungszentrum Jülich
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Filing: 1970-05-04
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Granted: 1972-09-26
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Expires: 1990-05-04
Abstract
Abstract A duct system for low-temperature fluids, especially lowboiling-point gases such as helium, and for thermally isolated electrical conductors wherein an evacuated outer rigid conduit surrounds the fluid-carrying duct which consists of a foil flexible and nonsupporting at room temperature but reinforced by a helical strip. The foil preferably consists of polyethyleneterephthalate.
Inventors
- 👤 Wolfgang Sassin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:54
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/18; F16L9/19; H; H01; H01B; H01B12/00; H01B12/16; Y; Y02; Y02E; Y02E40/00; Y02E40/60; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/7036
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
19 words
The system defined in claim 1 wherein the material of which the inner duct is made, is a polyethylene-terephthalate.
Claim 2
Dependent Claim
31 words
The system defined in claim 2 wherein said inner duct is a laminated duct from a plurality of layers each having a thickness of about 0.1 mm and being bonded together.
Claim 3
Dependent Claim
17 words
The system defined in claim 2 wherein a plurality of such ducts extends through said intermediate shell.
Claim 4
Dependent Claim
50 words
The system defined in claim 1, further comprising a plurality of labyrinth seals axially spaced along said duct and subdividing said chamber into a plurality of chamber sections, respective suction means connected with each of said sections for maintaining same at pressures between about 10 3 torr to 1 torr.
Claim 5
Dependent Claim
18 words
The system defined in claim 5 wherein each of said labyrinth seals comprises a plurality of polytetrafluoroethylene disks.
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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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |