US4073443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Comminuting plant at cryogenic temperatures
Assignee: SIO PER L INDUSTRIA DELL OSSIGENO E DI ALTRI GAS SpA Soc
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Filing: 1977-02-14
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Granted: 1978-02-14
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Expires: 1997-02-14
Abstract
Abstract A plant for the cryogenic comminuting of materials which are resilient, th or difficult to comminute at room temperature, in particular rubber and plastic material, wherein the comminuting means, the charging hopper and the feeding means for the material to be comminuted are all contained within one and the same insulated enclosure, said enclosure being in communication with the outside only over calibrated adjustable openings defining a given outflow of gas, a cryogenic liquid is introduced in the comminuting means in a quantity that is variable according to the minimum optimal temperature required in the mill for any specific comminuting operation.
Inventors
- 👤 Francesco Danioni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:28
CPC Classifications
B; B02; B02C; B02C23/00; B02C23/08; B02C23/10; B02C23/12; B02C18/00; B02C18/06; B02C18/14; B02C18/148; B02C19/00; B02C19/18; B02C19/186; B29; B29B; B29B13/00; B29B13/10; Y; Y10; Y10S; Y10S241/00; Y10S241/37
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
135 words
A plant for comminuting materials that are difficult to comminute at room temperature, comprising: means defining a closed enclosure having heat insulated walls; a charging hopper in said enclosure and a charging opening in said enclosure for directing feed material into said hopper; comminuting means in said enclosure positioned to receive material from said hopper and further means in such enclosure for directing ground material from said comminuter out of said enclosure; means for directing a cryogenic liquid onto material in said comminuter and additional means for freely releasing cold gas from said comminuter and further means into said enclosure to maintain a refrigerated atmosphere therein; and controllable release means for releasing gas from said enclosure at a selected controlled rate to maintain a predetermined temperature and pressure in said enclosure and the means therein.
Claim 2
Dependent Claim
135 words
A plant for comminuting materials that are difficult to comminute at room temperature, comprising: means defining a closed enclosure having heat insulated walls; a charging hopper in said enclosure and a charging opening in said enclosure for directing feed material into said hopper; comminuting means in said enclosure positioned to receive material from said hopper and further means in such enclosure for directing ground material from said comminuter out of said enclosure; means for directing a cryogenic liquid onto material in said comminuter and additional means for freely releasing cold gas from said comminuter and further means into said enclosure to maintain a refrigerated atmosphere therein; and controllable release means for releasing gas from said enclosure at a selected controlled rate to maintain a predetermined temperature and pressure in said enclosure and the means therein.
Claim 3
Dependent Claim
32 words
A plant as defined in claim 1 wherein said further means includes a sifting device and a device for recycling over-size particles to said comminuter, all within the atmosphere in said enclosure.
Claim 4
Dependent Claim
38 words
A plant as defined in claim 1 wherein said comminuting means and said further means include enveloping housings in said enclosure, said additional means being openings in said housing to release gas and pressure therefrom into said enclosure.
Claim 5
Dependent Claim
26 words
A plant as defined in claim 1 wherein said comminuter is a centrifugal mill having at least the rotating parts thereof made of a stainless steel.
Claim 6
Dependent Claim
32 words
A plant as defined in claim 4 wherein said centrifugal mill includes a drive shaft extending outwardly through a wall of said enclosure and journalled in bearings within said heat insulated wall.
Claim 7
Dependent Claim
58 words
A plant as defined in claim 1 wherein said release means includes directing means for directing gas from the atmosphere in said enclosure into said charging hopper to pass through feed material therein and to said charging opening whereby the quantity of material in said hopper may be varied to regulate the resistance to flow of gas therethrough.
Claim 8
Dependent Claim
48 words
A plant as defined in claim 1 including a thermic feeler at a selected position adjacent said comminuter for detecting the temperature at said location whereby the rate of feed of cryogenic liquid to said comminuter may be regulated to maintain a desired predetermined temperature at said location.
References Cited (Backward Citations)
US357973A
Cited
US973761A
Cited
US2609150A
Cited
US3527414A
Cited
US3647149A
Cited
US3666185A
Cited
US3718284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |