US3957210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stirring mill
Assignee: Draiswerke GmbH
•
Filing: 1974-08-09
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Granted: 1976-05-18
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Expires: 1994-08-09
Abstract
Abstract An apparatus for the continuous dispersion and fine grinding of substances in a liquid or liquefiable dispersion medium, comprises of a cylindrical vessel, in the grinding chamber of which is disposed a coaxial stirrer shaft, which is adapted to be driven rotationally and is equipped with mixing tools, and a filling of grinding elements, the grinding chamber being immediately preceded by a device for mixing the substances with the dispersion medium.
Inventors
- 👤 Herbert Durr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:55
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/16; B01; B01F; B01F33/00; B01F33/80
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
120 words
A stirrer mill for the continuous dispersion and fine grinding of substances which tend to briquette or agglomerate in a liquefiable dispersion medium, comprising: grinding means including a cylindrical vessel, a stirrer shaft within said vessel and coaxial therewith, mixing tools disposed on said stirrer shaft, grinding elements disposed and retained within said vessel, and means for driving said shaft; mixing means immediately preceding and directly feeding into said grinding means, said mixing means consisting essentially of a cylindrical chamber, a mixing worm disposed coaxially within said cylinder chamber, and means for driving said worm; and metering means, immediately preceding and feeding directly into said mixing means, for dispensing metered quantities of substances and dispersion medium into said mixing means.
Claim 2
Dependent Claim
120 words
A stirrer mill for the continuous dispersion and fine grinding of substances which tend to briquette or agglomerate in a liquefiable dispersion medium, comprising: grinding means including a cylindrical vessel, a stirrer shaft within said vessel and coaxial therewith, mixing tools disposed on said stirrer shaft, grinding elements disposed and retained within said vessel, and means for driving said shaft; mixing means immediately preceding and directly feeding into said grinding means, said mixing means consisting essentially of a cylindrical chamber, a mixing worm disposed coaxially within said cylinder chamber, and means for driving said worm; and metering means, immediately preceding and feeding directly into said mixing means, for dispensing metered quantities of substances and dispersion medium into said mixing means.
Claim 3
Dependent Claim
47 words
A stirrer mill in accordance with claim 1 wherein said mixing means further comprises an inlet hopper at the end of said cylindrical chamber opposite said grinding means and wherein said metering means are for dispensing metered quantities of substances and dispersion medium into said inlet hopper.
Claim 4
Dependent Claim
40 words
A stirrer mill in accordance with claim 2 further comprising an additional means for dispensing metered quantities of substances or dispersion medium into said mixing means downstream -- as viewed in the direction of delivery -- of said inlet hopper.
Claim 5
Dependent Claim
39 words
A stirrer mill in accordance with claim 1 wherein said mixing means further includes forced delivery means for forcing the substances and dispersion medium being mixed into said worm to allow delivery in the direction of said grinding means.
Claim 6
Dependent Claim
30 words
A stirrer mill in accordance with claim 4, wherein said forced delivery means comprises a gear meshing with the grooves of said worm and freely participating in the rotation thereof.
Claim 7
Dependent Claim
28 words
A stirrer mill in accordance with claim 4, wherein said forced delivery means comprises balls circulating on a closed path and meshing with the grooves of said worm.
Claim 8
Dependent Claim
22 words
A stirrer mill in accordance with claim 4 wherein said forced delivery means comprises a second worm intermeshing with said first worm.
Claim 9
Dependent Claim
19 words
A stirrer mill in accordance with claim 7 wherein said second worm does not lead into said grinding means.
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) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |