US3674404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruder apparatus and accumulator
Assignee: Sherwood Medical Co
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Filing: 1970-08-06
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Granted: 1972-07-04
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Expires: 1990-08-06
Abstract
Abstract A DIE AND EXTRUDER APPARATUS FOR PRODUCING A WIDE VARIETY OF CONTOURED EXTRUDATE SUCH AS ROD OR TUBING SECTIONS THROUGH THE PROVISION OF A PISTON AND CYLINDER DEVICE INTERCONNECTED IN THE MOLTEN PLASTIC PASSAGE BETWEEN THE EXTRUDER AND THE DIE WITH THE PISTON OF THE PISTON AND CYLINDER DEVICE BEING DRIVEN IN A WITHDRAWAL STROKE TO REDUCE THE FLOW OF EXTRUDATE FROM THE EXTRUSION DIE IN A PROGRAMMED MANNER AND BEING DRIVEN IN AN INJECT STROKE TO INCREASE THE FLOW OF EXTRUDATE THROUGH THE EXTRUSION DIE IN A PROGRAMMED MANNER, TO VARY THE CONTOUR OF THE EXTRUDATE AT PREDETERMINED INTERVALS.
Inventors
- 👤 Norbert W Burlis
- 👤 Daniel A Talonn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:48
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0009; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/13; B29C48/25; B29C48/30; B29C48/32; B29C48/325; B29C48/36; B29C48/375; B29C48/388; B29C48/475; B29L; B29L2023/00; B29L2023/003
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |