Apparatus for jacketing tubular stock
Abstract
Abstract AN APPARATUS FOR JACKETING TUBULAR STOCK. METALLIC TUBULAR STOCK IS ADVANCED IN A PREDETERMINED DIRECTION THROUGH AN EXTRUDING DIE IN THE EXTRUDING HEAD OF AN EXTRUDER. IN THIS EXTRUDING DIE A JACKET CONSISTING OF A MIXTURE OF PRE-PLASTICATED SYNTHETIC PLASTIC MATERIAL AND A BLOWING AGENT AS EXTRUDED ONTO THE OUTER CIRCUMFERENTIAL SURFACE OF THE ADVANCING TUBULAR STOCK AND UNDERGOES FOAMING WHILE STILL WITHIN THE CONFINES OF THE DIE. AS THE JACKETED STOCK ISSUES FROM THE DIE IT PASSES THROUGH AN ANNULAR MEMBER HAVING AN INNER DIAMETER SLIGHTLY SMALLER THAN THE OUTER DIAMETER OF THE FOAMED JACKET SO THAT THE PERIPHERAL SURFACE LAYER OF THE JACKET IS DEFORMED INTO A CONTINUOUS SMOOTH SKIN. SUBSEQUENTLY, THE RESULTING JACKETED TUBULAR PRODUCT IS COOLED.
Inventors
- 👤 Helmut Benteler
- 👤 Wilheim Lachenmayer
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 |
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| 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 |