US4345363A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of continuously making flexible, heat insulated metal tubing
Assignee: KM Kabelmetal AG
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Filing: 1978-09-08
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Granted: 1982-08-24
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Expires: 1998-09-08
Abstract
Abstract Extruded, drawn and coiled copper tubing with wall thickness of 0.7 to 2 mm is soft annealed, straightened and jacketed in an extruder with a blend of polyvinyl chloride, chalk, a plasticizer and other additives for lubrication and stabilization. The jacket has inwardly extending ribs defining channels inbetween to enhance heat insulation.
Inventors
- 👤 Ottmar Leuchs
- 👤 Hans-Jurgen Kloppner
- 👤 Otto Uhlmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:15
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/06; F16L59/075; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/15; B29C48/151; F16L58/00; F16L58/02; F16L58/04; F16L58/10; F16L58/1054; F16L58/109; F16L9/00; F16L9/14; F16L9/147; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982; Y10T29/49986
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
128 words
Method of making a flexible, heat insulated tube for home construction purposes or the like, in a continuous process, comprising: providing a stock of coiled, seamless drawn copper tube having a wall thickness of about 0.7 to 2 mm and an outer diameter of 8 to 35 mm; providing a blend of 35 to 60% polyvinylchloride; 15 to 40% chalk; 15 to 30% phthalicacid ester as plasticizer; and 2 to 5% lead containing stabilizer, all percentages by weight; soft annealing and cooling said tube both under protective gas; and extruding the blend onto and around the cooled tube and in such a manner that the blend as extruded forms a jacket with radially inwardly directed, tapering ribs engaging the tube and defining heat insulating arch-shaped channels in between.
Claim 2
Dependent Claim
128 words
Method of making a flexible, heat insulated tube for home construction purposes or the like, in a continuous process, comprising: providing a stock of coiled, seamless drawn copper tube having a wall thickness of about 0.7 to 2 mm and an outer diameter of 8 to 35 mm; providing a blend of 35 to 60% polyvinylchloride; 15 to 40% chalk; 15 to 30% phthalicacid ester as plasticizer; and 2 to 5% lead containing stabilizer, all percentages by weight; soft annealing and cooling said tube both under protective gas; and extruding the blend onto and around the cooled tube and in such a manner that the blend as extruded forms a jacket with radially inwardly directed, tapering ribs engaging the tube and defining heat insulating arch-shaped channels in between.
Claim 3
Dependent Claim
21 words
Method as in claim 1, the annealing step being carried out as a direct resistive heat step of the copper tube.
Claim 4
Dependent Claim
13 words
Method as in claim 1, said blend including, additionally, up to 1% lubricant.
Claim 5
Dependent Claim
14 words
Method as in claim 3, said lubricant being a long chain ester hard wax.
Claim 6
Dependent Claim
22 words
Method as in claim 1 or 4, said plasticizer being about 2/3 branched phthalicacid ester and about 1/3 linear chain phthalicacid ester.
Claim 7
Dependent Claim
14 words
Method as in claim 1 or 4, said stabilizer being a tribasic lead sulfate.
Claim 8
Dependent Claim
21 words
Method as in claim 3 or 4, said blend including from 45 to 55% polyvinyl chloride and 25 to 30% chalk.
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) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |