US4184772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixing apparatus
Assignee: Frenkel CD AG
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Filing: 1977-07-11
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Granted: 1980-01-22
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Expires: 1997-07-11
Abstract
Abstract This invention provides in a continuously operating device having a mixing section comprising opposite-handed helical threads in each of the two relatively rotatable components which threads vary in cross-sectional area in complementary fashion so as to produce a layer-by-layer material transfer and shear working between the said components, that the said opposite handed helical threads in said mixing section complement one another substantially also in respect to their helix-angles to the extent that if one helix angle is between 0°and 45° the other is between 45° and 90°, to bring about, viewed with respect to the shear-plane-area, a subdivision sufficient for the mixing and compounding requirement.
Inventors
- 👤 Paul Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:32
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/428; B29B7/429; B29B7/425; B29C; B29C48/00; B29C48/25; B29C48/268; B29C48/36; B29C48/395; B29C48/50; B29C48/505; B29C48/56; B29C48/68; B29C48/685; B29C48/686; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/92571; B29C2948/92819; B29C2948/92857; B29C2948/92876; B29C2948/92885; B29C48/03
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
109 words
Continuously operating mixing apparatus comprising a rotor mounted to rotate on its axis within a coaxial barrel, the rotor having an external helical thread and the barrel having an internal helical thread of opposite hand to but coaxial with the helical thread on the rotor, said apparatus having at least one mixing zone wherein said threads vary in cross-sectional area in complementary fashion in respect to one another, and wherein said opposite-handed helical threads in a mixing zone complement one another substantially also in respect to their helix angles to the extent that if one helix angle is between 0° and 45°, the other is between 45° and 90°.
Claim 2
Dependent Claim
109 words
Continuously operating mixing apparatus comprising a rotor mounted to rotate on its axis within a coaxial barrel, the rotor having an external helical thread and the barrel having an internal helical thread of opposite hand to but coaxial with the helical thread on the rotor, said apparatus having at least one mixing zone wherein said threads vary in cross-sectional area in complementary fashion in respect to one another, and wherein said opposite-handed helical threads in a mixing zone complement one another substantially also in respect to their helix angles to the extent that if one helix angle is between 0° and 45°, the other is between 45° and 90°.
Claim 3
Dependent Claim
32 words
Apparatus according to claim 1 wherein the sum of the helix angle of the rotor thread and the helix angle of the barrel thread in the same mixing zone is about 90°.
Claim 4
Dependent Claim
22 words
Apparatus according to claim 1 wherein the thread which has a helix angle above 45° is constructed with more than eight starts.
Claim 5
Dependent Claim
13 words
Apparatus according to claim 1 wherein continuously adjustable output throttling means are provided.
Claim 6
Dependent Claim
26 words
Apparatus according to claim 4 wherein the throttling means comprises at least one bore-restricting member mounted for adjustable radial advancement into an extension of the barrel.
Claim 7
Dependent Claim
28 words
Apparatus according to claim 4 comprising a plurality of said members adapted to meet one another within the bore and having peripheral passageways for predetermined limitation of closure.
References Cited (Backward Citations)
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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) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |