US3562860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for making pipe bends of thermoplastic material
Assignee: Hoechst AG
•
Filing: 1968-11-13
•
Granted: 1971-02-16
•
Expires: 1988-11-13
Abstract
Abstract PIPE BENDS OF THERMOPLASTIC MATERIAL ARE MANUFACTURED BY THERMOFORMING BY SHOVING A SLEEVE-SHAPED PIPE SECTION WHICH IS CLOSED AT ONE END INTO A PIPE BEND MOULD WHICH IS SYMMETRICALLY SPLIT IN THE LONGITUDINAL DIRECTION. THE INTRODUCTION IS CARRIED OUT WITH THE HELP OF A FLEXIBLE CORE WHICH IS SEVERAL TIMES SPLIT LONGITUDINALLY AND WHICH IS PRESSED AGAINST THE BOTTOM OF THE PIPE SECTION. AFTER COOLING, THE MOULD IS OPENED AND THE CORE OR ITS INDIVIDUAL PARTS ARE PULLED OUT OF THE PIPE BEND AND THE ENDS OF THE LATTER ARE TRIMMED.
Inventors
- 👤 Emil Rottner
- 👤 Franz Bock
- 👤 Gunter Wenzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:38
CPC Classifications
F; F16; F16L; F16L43/00; F16L43/008; B; B29; B29C; B29C53/00; B29C53/02; B29C53/08; B29C53/083; B29C53/80; B29C53/82; B29L; B29L2023/00; B29L2023/22
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |