Method for making tubular articles from a thermoplastic material
Abstract
Abstract The end of a thermoplastic tubular article is molded to form a socket portion greater in diameter than the diameter of the tubular article and the end is enlarged to diameter greater than the socket portion with there being an annular shoulder between the socket and enlarged end portions. The enlarged end portion is heated to thermoelasticity and the outer edge of the enlarged end is drawn inwardly while the enlarged diameter end portion is restrained against outward radial movement and the socket portion restrained against both inward and outward radial movement. The extend of inward axial movement of the outer edge will determine the configuration of the annular corrugation formed in the enlarged end.
Inventors
- 👤 J Guetlhuber
- 👤 R Heitzer
- 👤 L Neueder
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |