Patent FR1117079A successfully refreshed from Google Patents.
US4288653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
District-heating line and a method of manufacturing the same
Assignee: Individual
•
Filing: 1980-03-17
•
Granted: 1981-09-08
•
Expires: 2000-03-17
Abstract
Abstract A district-heating line comprising an inner metal tube intended for the transfer of heating medium and encircled by an insulating layer of foamed plastic. Arranged around the insulating layer is a protective tube. To enable an alarm to be given in the event of a fault in the line, there is fixedly mounted on the outer cylindrical surface of the metal tube, an elongated block which carries at least one alarm conductor, said conductor being grouted in a fixed position in an associated channel in the block by the foamed plastic insulating material. In this way, the alarm conductor can be fixed at a given distance from the metal tube, to facilitate the localizing of a fault.
Inventors
- 👤 Hans Blom
- 👤 Leif Wiberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:05
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/143; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49838
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
A district heating line of the kind including an inner metal tube for transporting a heat transfer medium, an insulating layer of foam-plastic material arranged around the metal tube, a moisture impenetrable protective tube surrounding said foam-plastic layer, at least one electrical conductor formed as part of an electrical circuit, elongated blocks mounted on and affixed to the inner metal tube along the length of the tube, said blocks being made of electrically insulating material and having extending along the length thereof at least one radially outwardly opening channel with the channels on adjacent blocks aligned with one another, said channels being dimensioned to accommodate said electrical conductor and position it at a fixed distance from the outer cylindrical surface of the inner metal tube, and means securing said electrical conductor in said channels at said fixed distance from the outer cylindrical surface of the inner metal tube.
Claim 2
Dependent Claim
148 words
A district heating line of the kind including an inner metal tube for transporting a heat transfer medium, an insulating layer of foam-plastic material arranged around the metal tube, a moisture impenetrable protective tube surrounding said foam-plastic layer, at least one electrical conductor formed as part of an electrical circuit, elongated blocks mounted on and affixed to the inner metal tube along the length of the tube, said blocks being made of electrically insulating material and having extending along the length thereof at least one radially outwardly opening channel with the channels on adjacent blocks aligned with one another, said channels being dimensioned to accommodate said electrical conductor and position it at a fixed distance from the outer cylindrical surface of the inner metal tube, and means securing said electrical conductor in said channels at said fixed distance from the outer cylindrical surface of the inner metal tube.
Claim 3
Dependent Claim
18 words
The district heating line of claim 1 in which the elongated blocks are made of a foam-plastic material.
Claim 4
Dependent Claim
19 words
The district heating line of claim 1 in which said electrical conductor is stretched when accommodated in said channels.
Claim 5
Independent Claim
113 words
A method of manufacturing a district heating line including the steps of forming elongated blocks each having at least one axially extending radially outwardly opening channel dimensioned to receive at least one electrical conductor, attaching a plurality of said elongated blocks to the outer surface of a metal tube with the channels of adjacent blocks in alignment, positioning at least one electrical conductor in the aligned channels and securing said conductor at a fixed distance from said elongated metal tube, arranging a protective tube around and coaxial with the metal tube and elongated blocks, and pouring a hardenable foamable plastic material in the annular chamber between the metal tube and the protective tube.
Claim 6
Independent Claim
113 words
A method of manufacturing a district heating line including the steps of forming elongated blocks each having at least one axially extending radially outwardly opening channel dimensioned to receive at least one electrical conductor, attaching a plurality of said elongated blocks to the outer surface of a metal tube with the channels of adjacent blocks in alignment, positioning at least one electrical conductor in the aligned channels and securing said conductor at a fixed distance from said elongated metal tube, arranging a protective tube around and coaxial with the metal tube and elongated blocks, and pouring a hardenable foamable plastic material in the annular chamber between the metal tube and the protective tube.
References Cited (Backward Citations)
US243282A
Cited
DE579184C
Cited
FR1377519A
Cited
US4013924A
Cited
SU612102A1
Cited
GB1455415A
Cited
DE2640161A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |