Extrusion apparatus
Abstract
Abstract IMPROVED APPARATUS FOR THE EXTRUSION OF ARTICLES HAVING ELONGATED CAVITIES IN THEM, INCLUDING AN ARRAY OF PARALLEL TUBES REMOVABLY MOUNTED IN A HOLDING PLATE AND HAVING BLOCKED DOWNSTREAM ENDS AND LATERAL OPENINGS EXTENDING IN THE DIRECTION OF EXTRUSION. DURING EXTRUSION, THE CLAY OR OTHER MATERIAL FIRST PASSES THROUGH UPSTREAM PARTS OF THE TUBES THEN, AFTER HAVING PASSED BEYOND THE HOLDING PLATE, PASSES THROUGH THE LATERAL OPENINGS IN THE TUBES, AND THEN BETWEEN THE BLOCKED DOWNSTREAM ENDS OF THE TUBES. IN ACCORDANCE WITH THE INVENTION THE TUBES ARE RE- TAINED IN THE HOLDING PLATE BY MEANS OF COLLARS AT THEIR UPSTREAM ENDS, AND THE THICKNESS OF THE PLATE IS APPROXIMATELY EQUAL TO THE DISTANCE BETWEEN THE COLLARS AND THE LATERAL OPENINGS IN THE TUBES.
Inventors
- 👤 Jurgen Schmidt
- 👤 Hans-Georg Nitzsche
Bibliographic Details
Claims Analysis
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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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |