US3734413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidized bed jet mill
Assignee: Alpine AG
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Filing: 1971-04-21
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Granted: 1973-05-22
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Expires: 1991-04-21
Abstract
Abstract The method and apparatus disclosed relates to an improved jet mill in which the material to be ground is fed into a chamber or zone containing a jet that emanates from a nozzle with high velocity, the material being in the state of a compact bed and the outlet of the nozzle being located beneath the surface of the bed. The bed is preferably a ''''moved compact bed'''' arranged so that the material to be ground is fed sideways into the jet. A sifter or classifier for the coarse and fine material produced in the grinding operation is arranged above the bed of material in the grinding chamber or zone. The compact bed of material may be moved in a variety of ways, and the volume occupied by it is filled up to the greater part with compact granular material. This could be defined as the ratio of wholly occupied volume to the volume of the compact matter, or by the term ''''compact current'''' as commonly employed in the pneumatic transportation art.
Inventors
- 👤 F Kaiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:13
CPC Classifications
B; B02; B02C; B02C23/00; B02C23/08; B02C23/16; B02C19/00; B02C19/06; B02C19/068; B02C23/10; B02C23/12; B02C25/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
109 words
A jet mill for comminuting or grinding granular materials by inter-particle impact, comprising a grinding chamber containing a bed of granular material to be disintegrated, means for supplying granular material to the grinding chamber to maintain the bed, an upwardly directed nozzle means located in the lower portion of the chamber for delivering a high velocity jet of gaseous material into the bed of granular material in the chamber, means for delivering gaseous material to the nozzle means to provide the jet, and means for moving granular material to be acted on by the jet into a side of the jet of gaseous material issuing from the nozzle means.
Claim 2
Dependent Claim
109 words
A jet mill for comminuting or grinding granular materials by inter-particle impact, comprising a grinding chamber containing a bed of granular material to be disintegrated, means for supplying granular material to the grinding chamber to maintain the bed, an upwardly directed nozzle means located in the lower portion of the chamber for delivering a high velocity jet of gaseous material into the bed of granular material in the chamber, means for delivering gaseous material to the nozzle means to provide the jet, and means for moving granular material to be acted on by the jet into a side of the jet of gaseous material issuing from the nozzle means.
Claim 3
Dependent Claim
32 words
A jet mill as claimed in claim 1, wherein the nozzle means is set to direct a jet of gaseous material vertically into and through the bed of material in the chamber.
Claim 4
Dependent Claim
33 words
A jet mill as claimed in claim 1, wherein the nozzle means is provided with means for automatically closing its outlet in response to the stopping of the delivery of gaseous material thereto.
Claim 5
Dependent Claim
33 words
A jet mill as claimed in claim 1, wherein the nozzle means includes means for delivering a plurality of converging jet streams which collide at an acute angle in the bed of material.
Claim 6
Dependent Claim
45 words
A jet mill as claimed in claim 1, wherein the nozzle means includes a plurality of upwardly directed nozzles arranged in a ring, and a stirrer located inside the ring of nozzles for moving granular material into the jets issuing from the ring of nozzles.
Claim 7
Dependent Claim
34 words
A jet mill as claimed in claim 1, including means for introducing and distributing a gaseous means into the lower portion of the bed of material in the grinding chamber to fluidize the bed.
Claim 8
Dependent Claim
118 words
A jet mill for comminuting or grinding granular materials by inter-particle impact, comprising a grinding chamber containing a bed of granular material to be disintegrated, means for supplying granular material to the grinding chamber to maintain the bed, an upwardly directed nozzle means located in the lower portion of the chamber for delivering a high velocity jet of gaseous material into the bed of granular material in the chamber, means for delivering gaseous material to the nozzle means to provide the jet, a feed bin, an overflow from the mill chamber into the feed bin, and means for supplying granular material from the bin into the side of the jet of gaseous material issuing from the nozzle means.
Claim 9
Dependent Claim
118 words
A jet mill for comminuting or grinding granular materials by inter-particle impact, comprising a grinding chamber containing a bed of granular material to be disintegrated, means for supplying granular material to the grinding chamber to maintain the bed, an upwardly directed nozzle means located in the lower portion of the chamber for delivering a high velocity jet of gaseous material into the bed of granular material in the chamber, means for delivering gaseous material to the nozzle means to provide the jet, a feed bin, an overflow from the mill chamber into the feed bin, and means for supplying granular material from the bin into the side of the jet of gaseous material issuing from the nozzle means.
Claim 10
Dependent Claim
121 words
A jet mill for comminuting or grinding granular materials by inter-particle impact, comprising a grinding chamber containing a bed of granular material to be disintegrated, means for supplying granular material to the grinding chamber to maintain the bed, an upwardly directed nozzle means located in the lower portion of the chamber for delivering a high velocity jet of gaseous material into the bed of granular material in the chamber, means for delivering gaseous material to the nozzle means to provide the jet, means for moving granular material to be acted on by the jet into a side of the jet of gaseous material issuing from the nozzle means, and means for vibrating the bed of granular material in the grinding chamber.
Claim 11
Dependent Claim
121 words
A jet mill for comminuting or grinding granular materials by inter-particle impact, comprising a grinding chamber containing a bed of granular material to be disintegrated, means for supplying granular material to the grinding chamber to maintain the bed, an upwardly directed nozzle means located in the lower portion of the chamber for delivering a high velocity jet of gaseous material into the bed of granular material in the chamber, means for delivering gaseous material to the nozzle means to provide the jet, means for moving granular material to be acted on by the jet into a side of the jet of gaseous material issuing from the nozzle means, and means for vibrating the bed of granular material in the grinding chamber.
Claim 12
Dependent Claim
135 words
A jet mill for comminuting or grinding granular materials by inter-particle impact, comprising a grinding chamber containing a bed of granular material to be disintegrated, means for supplying granular material to the grinding chamber to maintain the bed, an upwardly directed nozzle means located in the lower portion of the chamber for delivering a high velocity jet of gaseous material into the bed of granular material in the chamber, means for delivering gaseous material to the nozzle means to provide the jet, means for moving granulaR material to be acted on by the jet into a side of the jet of gaseous material issuing from the nozzle means, a level tracer for controlling the level of the granular material bed in the mill chamber, and a control actuated by the movement of the level tracer.
Claim 13
Dependent Claim
135 words
A jet mill for comminuting or grinding granular materials by inter-particle impact, comprising a grinding chamber containing a bed of granular material to be disintegrated, means for supplying granular material to the grinding chamber to maintain the bed, an upwardly directed nozzle means located in the lower portion of the chamber for delivering a high velocity jet of gaseous material into the bed of granular material in the chamber, means for delivering gaseous material to the nozzle means to provide the jet, means for moving granulaR material to be acted on by the jet into a side of the jet of gaseous material issuing from the nozzle means, a level tracer for controlling the level of the granular material bed in the mill chamber, and a control actuated by the movement of the level tracer.
Claim 14
Dependent Claim
42 words
A jet mill as claimed in claim 9, wherein the level tracer includes a baffle plate located in the upper part of the grinding chamber and acted on by the jet issuing upwardly from the body of granular material in the chamber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |