Patent US3698440A successfully refreshed from Google Patents.
US3698440A
Expired / Lapsed
US
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Thermally insulated conduit
Assignee: KM Kabelmetal AG
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Filing: 1971-04-20
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Granted: 1972-10-17
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Expires: 1991-04-20
Abstract
Abstract Thermally insulated conduit of indefinite length for transporting liquid or gaseous material in a heated or cooled state; the conduit including an oscillation damping layer.
Inventors
- 👤 Paul Matthieu
- 👤 Ottmar Leuchs
- 👤 Fritz Glander
- 👤 Hubert Kuypers
- 👤 Diethart Pelz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:02
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L55/00; F16L55/04; F16L59/12; F16L59/125; F16L59/153; F16L9/00; F16L9/14; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139; Y10T428/1393; Y10T428/24; Y10T428/24744
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
50 words
A thermally insulated conduit for transporting liquids or gases in a heated or cooled state, said conduit comprising a pair of concentric, transversely corrugated tubings providing an annular space therebetween and a layer of oscillation damping, thixotropic material in said space and in contact with the innermost of said tubings.
Claim 2
Dependent Claim
50 words
A thermally insulated conduit for transporting liquids or gases in a heated or cooled state, said conduit comprising a pair of concentric, transversely corrugated tubings providing an annular space therebetween and a layer of oscillation damping, thixotropic material in said space and in contact with the innermost of said tubings.
Claim 3
Dependent Claim
23 words
A thermally insulated conduit as in claim 1 and further including a layer of heat insulating material disposed outwardly of said thixotropic material.
Claim 4
Dependent Claim
13 words
A conduit as in claim 1 wherein said tubings are formed of metal.
Claim 5
Dependent Claim
18 words
A conduit as in claim 1 wherein at least one of said tubings is formed of synthetic resin.
Claim 6
Dependent Claim
19 words
A conduit as in claim 1 wherein said thixotropic material comprises successive longitudinal sections of alternating hardness and softness.
Claim 7
Dependent Claim
20 words
A conduit as in claim 1 wherein said thixotropic material comprises a hydrous dispersion of polyvinyl acetate filled with vermiculite.
Claim 8
Dependent Claim
18 words
A conduit as in claim 6, and further including a filler of powdered barium sulfate in said dispersion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |