US3713592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for the fine comminution of solids
Assignee: Individual
•
Filing: 1970-10-01
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Granted: 1973-01-30
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Expires: 1990-10-01
Abstract
Abstract A process for the fine comminution of solids made brittle by their immersion into a cold liquefied gas is characterized in that all of the cold material comminuted after its cooling down to the temperature of the liquefied cooling gas is subjected to at least one further pass of comminution relaying mainly on the pressure effects for causing the average particle size of the materials to be considerably reduced.
Inventors
- 👤 H Beike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:50
CPC Classifications
B; B02; B02C; B02C19/00; B02C19/18; B02C19/186
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
195 words
A method of pulverizing material in a crushing mill comprising the first step of passing the material to be pulverized into a countercurrent heat-exchanging relation with cold vapors produced by evaporation of a low-temperature liquefied gas, the second step of immersing the material in the liquefied gas from which the vapors have evaporated, the third step of conveying the material from the liquefied gas to the mill, and the fourth step of pulverizing the material in the mill, the fourth step taking place in the mill predominantly operating with crushing elements, the grain size of the pulverized material being determined in accordance with dimensions of the crushing elements of the mill, and the material being conveyed through the mill solely by mechanical force, and all of this cold material, pulverized in the fourth step after its cooling down to the temperature of the liquefied cooling gas, being subjected to at least one further pass of comminution taking place in a mill of the type used in the fourth step with serrated crushing elements having its serrated surfaces arranged to substantially reduce the average particle size in comparison to the preceding pass by predominantly compression effects.
Claim 2
Independent Claim
195 words
A method of pulverizing material in a crushing mill comprising the first step of passing the material to be pulverized into a countercurrent heat-exchanging relation with cold vapors produced by evaporation of a low-temperature liquefied gas, the second step of immersing the material in the liquefied gas from which the vapors have evaporated, the third step of conveying the material from the liquefied gas to the mill, and the fourth step of pulverizing the material in the mill, the fourth step taking place in the mill predominantly operating with crushing elements, the grain size of the pulverized material being determined in accordance with dimensions of the crushing elements of the mill, and the material being conveyed through the mill solely by mechanical force, and all of this cold material, pulverized in the fourth step after its cooling down to the temperature of the liquefied cooling gas, being subjected to at least one further pass of comminution taking place in a mill of the type used in the fourth step with serrated crushing elements having its serrated surfaces arranged to substantially reduce the average particle size in comparison to the preceding pass by predominantly compression effects.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein liquefied nitrogen is the cooling agent.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |