US3779521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion assembly
Assignee: Clextral SAS
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Filing: 1972-04-27
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Granted: 1973-12-18
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Expires: 1992-04-27
Abstract
Abstract An extruder for feeding a die which extruder includes a mixer unit and a pump unit each of which comprise a screw rotatable in a sleeve, the mixer unit screw having a succession of threads of different pitch while the pump unit sleeve is internally threaded with N threads of pitch P and the pump unit screw has a mating profile, has (N-1)P/N threads and is movable in orbital rotation about the pump unit sleeve axis in contact with the sleeve.
Inventors
- 👤 H Godines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:27
CPC Classifications
A; A21; A21C; A21C1/00; A21C1/06; A21C1/065; B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/395; B29C48/50; B29C48/68; B01; B01F; B01F27/00; B01F27/05; B01F27/11; B01F27/114; B01F27/1143; B01F27/60; B29C48/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
An extrusion unit with a screw rotatable in a sleeve for feeding a die, including a pumping zone to force the product through the die, a sleeve machined internally in the pumping zone with the helicoidal profile with N threads of pitch P, an offcentered screw in said sleeve of mating profile with said helicoidal profile with (N-1) threads of pitch (N-1)P/N and mechanism for setting said screw in ortibal rotation about the axis of said sleeve so as to bear against the internal surface of said sleeve.
Claim 2
Dependent Claim
88 words
An extrusion unit with a screw rotatable in a sleeve for feeding a die, including a pumping zone to force the product through the die, a sleeve machined internally in the pumping zone with the helicoidal profile with N threads of pitch P, an offcentered screw in said sleeve of mating profile with said helicoidal profile with (N-1) threads of pitch (N-1)P/N and mechanism for setting said screw in ortibal rotation about the axis of said sleeve so as to bear against the internal surface of said sleeve.
References Cited (Backward Citations)
US2957427A
Cited
US3006615A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |