Patent US3738394A successfully refreshed from Google Patents.
US3738394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible grooved pipe
Assignee: Westaflex Werk L und F Westerbarkey and Co GmbH
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Filing: 1971-01-29
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Granted: 1973-06-12
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Expires: 1991-01-29
Abstract
Abstract A helically-corrugated flexible pipe wound from metal foil or sheet metal strips is characterized in that the grooves or ribs are upset or pressed in a gradually increasing manner toward the ends of the pipe.
Inventors
- 👤 L Westerbarkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:35
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/02; F16L9/06; F16L11/00; F16L11/14; F16L11/16; F16L9/16; F16L9/165
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
24 words
A helically corrugated flexible wound metal pipe, the corrugations of said pipe being increasingly radially compressed towards at least one end of the pipe.
Claim 2
Dependent Claim
24 words
A helically corrugated flexible wound metal pipe, the corrugations of said pipe being increasingly radially compressed towards at least one end of the pipe.
Claim 3
Dependent Claim
34 words
A pipe in accordance with claim 1, wherein the corrugations an and end of the pipe are increasingly compressed over a length of the pipe corresponding to at least one diameter of the pipe.
Claim 4
Dependent Claim
32 words
A pipe in accordance with claim 1, wherein the corrugations are increasingly compressed in at least one wedge-shaped area of the pipe wall, said area widening towards the end of the pipe.
Claim 5
Dependent Claim
25 words
A pipe in accordance with claim 1, wherein the flexibility of the pipe gradually diminishes toward the ends of the pipe, said ends being rigid.
References Cited (Backward Citations)
US2954802A
Cited
US2986169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |