US3664795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw extruders with dual section ejection zone
Assignee: Oerlikon Barmag AG
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Filing: 1969-07-01
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Granted: 1972-05-23
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Expires: 1989-07-01
Abstract
Abstract SCREW EXTRUDERS FOR EXTRUSION OF HIGH VISCOSITY THERMOPLASTIC METALS EMBODYING A DUAL SECTION EJECTION ZONE WHEREIN THE DOWNSTREAM SECTION HAS UP TO EIGHT TIMES THE LENGTH OF THE UPSTREAM SECTION AND ALSO A GREATER THREAD DEPTH OF THE SCREW PORTION THEREIN.
Inventors
- 👤 Heinz Schippers
- 👤 Friedhelm Hensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:39
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/68; B29C48/395; B29C48/505; B29C48/53; B29C48/03
Claims Analysis
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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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |