Patent US3570545A successfully refreshed from Google Patents.
US3570545A
Expired / Lapsed
US
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Insulated tube and method of making the same
Assignee: Benteler Deutschland GmbH
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Filing: 1968-09-27
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Granted: 1971-03-16
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Expires: 1988-09-27
Abstract
Abstract A tube and the method of making the same. A steel tube is internally clad with corrosion-resistant material and externally jacketed with foamed plastic material having a volumetric weight which at most approaches 0.7 p/cm.3. The resulting product is corrosion-resistant as well as thermally insulated and sound insulated.
Inventors
- 👤 Helmut Benteler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:40
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L58/00; F16L58/02; F16L58/04; F16L58/08; F16L58/10; F16L58/1009; F16L58/1054; F16L58/1063; F16L59/02; F16L59/028; F16L59/143; F16L9/00; F16L9/21; F28; F28F; F28F2270/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
63 words
A tube, particularly a pipe for liquids, comprising an inner tubular layer adapted for passage of a fluid therethrough and consisting of a corrosion-resistant material; an outer tubular layer of steel surrounding and bonded to said inner tubular layer; and a sound and thermally insulating jacket of foamed polyolefin having a volumetric weight at most approaching 0.7 p/cm.3 surrounding said outer tubular layer.
Claim 2
Dependent Claim
63 words
A tube, particularly a pipe for liquids, comprising an inner tubular layer adapted for passage of a fluid therethrough and consisting of a corrosion-resistant material; an outer tubular layer of steel surrounding and bonded to said inner tubular layer; and a sound and thermally insulating jacket of foamed polyolefin having a volumetric weight at most approaching 0.7 p/cm.3 surrounding said outer tubular layer.
Claim 3
Dependent Claim
14 words
A tube as defined in claim 1, said inner tubular layer consisting of copper.
Claim 4
Dependent Claim
19 words
A tube as defined in claim 2, said outer and said inner tubular layers together constituting an integral unit.
Claim 5
Dependent Claim
17 words
A tube as defined in claim 1, said inner tubular layer consisting of homogeneous synthetic plastic material.
Claim 6
Dependent Claim
14 words
A tube as defined in claim 4, wherein said synthetic plastic material is polyolefin.
Claim 7
Dependent Claim
20 words
A tube as defined in claim 1, said inner tubular layer consisting of chrome-nickel steel resistant to acids and alkalis.
Claim 8
Dependent Claim
31 words
A tube as defined in claim 1, said inner tubular layer consisting of stainless steel including a chrome content of substantially 18-20 percent and a nickel content of substantially 6-8 percent.
Claim 9
Dependent Claim
17 words
A tube as defined in claim 1, said jacket having a volumetric weight smaller than 0.5 p/cm.3.
Claim 10
Dependent Claim
22 words
A tube as defined in claim 1, said jacket including between substantially 6-15 parts by weight of a lightweight thermally insulating substance.
Claim 11
Dependent Claim
13 words
A tube as defined in claim 9, said thermally insulating substance being asbestos.
Claim 12
Dependent Claim
14 words
A tube as defined in claim 9, said thermally insulating substance being powdered diatomite.
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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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |