US3561492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible liquid conduit
Assignee: KM Kabelmetal AG
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Filing: 1968-06-03
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Granted: 1971-02-09
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Expires: 1988-06-03
Abstract
Abstract This application discloses a corrugated pipe with folds and ridges extending around the axis and alternating along the axis. The radius of curvature of the flow-throttling folds is larger than the radius of curvature of the adjacent corrugation ridges, and half of the peak-to-peak distance of folds (or ridges) in axial direction has approximately a 1:1 ratio to the fold-toridge amplitude of the corrugations.
Inventors
- 👤 Knut Kauder
- 👤 Herbert Bittner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:26
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/20; F16L11/14; F16L11/15; F16L59/00; F16L59/14; F16L59/153
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A flexible pipe as a conduit for fluids, having corrugated wall structure, the improvement comprising: i. a corrugation of the wall defined by axially spaced ridges and folds, the ratio between the ridge-to-fold corrugation amplitude to half of the axial ridge-to-ridge distance has a value between 0.4 to 1.3; ii. the cross-sectional contours of ridges and folds are parabolas, whereby radius of curvature of the corrugation folds is larger than radius of curvature of the corrugation ridges, so that the flow space through the pipe is established as a sequence of nozzles established by the corrugation folds with parabolic contour along the flow axis.
Claim 2
Dependent Claim
104 words
A flexible pipe as a conduit for fluids, having corrugated wall structure, the improvement comprising: i. a corrugation of the wall defined by axially spaced ridges and folds, the ratio between the ridge-to-fold corrugation amplitude to half of the axial ridge-to-ridge distance has a value between 0.4 to 1.3; ii. the cross-sectional contours of ridges and folds are parabolas, whereby radius of curvature of the corrugation folds is larger than radius of curvature of the corrugation ridges, so that the flow space through the pipe is established as a sequence of nozzles established by the corrugation folds with parabolic contour along the flow axis.
Claim 3
Dependent Claim
16 words
A pipe in accordance with claim 1, there being a thermal insulating layer around the pipe.
Claim 4
Dependent Claim
23 words
A pipe in accordance with claim 1, there being a corrugated metallic outer pipe surrounding the thermal insulation on the inner corrugated pipe.
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |