US3616006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of enveloping a steel pipe
Assignee: Vodafone GmbH
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Filing: 1969-07-07
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Granted: 1971-10-26
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Expires: 1989-07-07
Abstract
Abstract A method of enveloping a steel pipe includes the simultaneous winding of the heated pipe with a twin layer of two materials in screw thread fashion. The outer material is a thermoplastic synthetic sheet, and the inner material an adhesive strip.
Inventors
- 👤 Helmut Landgraf
- 👤 Walter Quitmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:22
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/02; F16L58/16; B; B29; B29C; B29C63/00; B29C63/02; B29C63/04; B29C63/08; B29C63/10; B29C63/105; B65; B65H; B65H81/00; B65H81/06; B65H81/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
In a method enveloping a steel pipe, heated to a predetermined elevated temperature, with an elongated sheet of thermoplastic synthetic material, the steps comprising, winding the sheet in screw thread fashion of a certain pitch about the external surface of said pipe while rotating the pipe, resulting in an envelope of overlapping sheet windings having a predetermined width of overlapping, simultaneously therewith, winding an adhesive strip, of high viscosity at said elevated temperature, between said external surface of the pipe and said sheet in screw thread fashion of substantially said certain pitch, with one edge of said adhesive strip disposed below, in substantially the same vertical plane as, an edge of said sheet, the width of said sheet being a multiple of the width of said adhesive strip, and the width of said adhesive strip being at least as large as said width of pitch and the step of extruding simultaneously said elongated sheet of synthetic material and said adhesive strip prior to the winding thereof onto said pipe.
Claim 2
Dependent Claim
52 words
In a method of enveloping a steel pipe, as claimed in claim 1, the step of pressing the under face of the synthetic sheet that faces said external surface of said pipe onto the upper face of said adhesive strip prior to the winding of said sheet and strip onto the pipe.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |