Patent US3701618A successfully refreshed from Google Patents.
US3701618A
Expired / Lapsed
US
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Peristaltic extrusion press
Assignee: Individual
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Filing: 1971-01-27
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Granted: 1972-10-31
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Expires: 1991-01-27
Abstract
Abstract AN EXTRUSION PRESS WHICH FORCES PLASTIC MATERIAL THROUGH A DIE PLATE BY MEANS OF ONE OR MORE PERISTALTIC PUMPS EACH HAVING A HYDRAULICALLY ACTUATED TUBULAR ELASTOMERIC DIAPHRAGM AS THE PUMPING ELEMENT. THE PERISTALTIC PUMPS ARE USED EITHER SINGLY OR IN SERIES TO FEED MATERIAL DIRECTLY THROUGH A DIE PLATE, OR ARE CONNECTED IN GROUPS OF SERIES-CONNECTED PUMPS TO FEED A PLENUM CHAMBER CONTAINING THE DIE PLATE. PUMP LINING SLEEVES FACILITATE CLEANING AND PROTECT THE DIAPHRAGMS AGAINST CORROSION. PERFORATED PLATES POSITIONED BETWEEN SERIES-CONNECTED PUMPS FACILITATE STRAINING AND MIXING OF THE PLASTIC MATERIAL.
Inventors
- 👤 Donald G Wall
- 👤 Kenneth N Temkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:25
CPC Classifications
B; B28; B28B; B28B3/00; B28B3/20
Claims Analysis
Total Claims: 0
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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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |