Patent US3606670A successfully refreshed from Google Patents.
US3606670A
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Method for forming spiral wound synthetic pipes
Assignee: Dynamit Nobel AG
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Filing: 1968-10-02
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Granted: 1971-09-21
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Expires: 1988-10-02
Abstract
Abstract A PIPE IS CONTINUOUSLY FORMED BY SPIRALLY WINDING A BAND ONTO THE CYLINDRICAL PORTION OF A MANDREL AFTER THE BAND EXITS FROM A SYNTHETIC MATERIAL EXTRUDING MACHINE WHILE STILL THERMOELASTIC OR AFTER A PREFORMED BAND IS PASSED THROUGH THE SUITABLE HEATING DEVICE. ONE LONGITUDINAL EDGE OF THE BAND IS PROVIDED WITH A RADIALLY OUTWARDLY WIDENING TONGUE AND THE OTHER LONGITUDINAL EDGE OF THE BAND IS PROVIDED WITH A RADIALLY INWARDLY WIDENING CHANNEL. IN FORMING THE PIPE, THE TONGUE IS COOLED TO BE RIGID AND INSERTED INTO THE THERMOELASTICALLY HEATED CHANNEL OF AN ADJACENT LAP OF THE SPIRALLY WOUND BAND.
Inventors
- 👤 Michael Wienand
- 👤 Klaus Jensen
- 👤 Franz Primessing
- 👤 Franz Werner Alfter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:25
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/01; B29C66/02; B29C66/024; B29C66/0244; B29C53/00; B29C53/56; B29C53/58; B29C53/78; B29C65/00; B29C65/02; B29C65/10; B29C65/56; B29C65/567; B29C65/568; B29C66/0242; B29C66/05; B29C66/10; B29C66/12; B29C66/124; B29C66/1242; B29C66/12421; B29C66/12423; B29C66/1244; B29C66/12441; B29C66/1246; B29C66/12461; B29C66/12469; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/4329; B29C66/49; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81411; B29C66/81421; B29C66/81423; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413; B65; B65H; B65H81/00; B65H81/06; B65H81/08; F; F16; F16L; F16L9/00; F16L9/16; B29C65/103; B29C65/48; B29C65/4895; B29C65/58; B29C66/71; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/4987; Y10T29/49876; Y10T29/53; Y10T29/53657
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |