US3643875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid energy grinding method and system
Assignee: Texaco Inc
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Filing: 1969-06-27
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Granted: 1972-02-22
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Expires: 1989-06-27
Abstract
Abstract A fluid energy grinding system wherein a stream of a dispersion of solid particles suspended in gas or vapor is accelerated to supersonic velocity in a nozzle having a divergent discharge section sufficient to produce a standing shock wave along the path of flow of solid particles effecting size reduction of particles.
Inventors
- 👤 Roger M Dille
- 👤 Warren G Schlinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:50
CPC Classifications
B; B01; B01J; B01J2/00; B02; B02C; B02C19/00; B02C19/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
26 words
A system as described in claim 1 wherein a pair of said converging-diverging nozzles are positioned with their discharge openings substantially in opposition to each other.
Claim 2
Dependent Claim
21 words
A system as defined in claim 1 wherein the angle of divergence of said discharge opening is from 15* to 60*.
Claim 3
Independent Claim
144 words
A method for reducing the size of coarse particles of a solid material which comprises the following steps in sequence: a. forming, as a flowing stream, a dispersion of said coarse particles in a gaseous medium, b. accelerating said dispersion at superatmospheric pressure to supersonic velocity while introducing said dispersion into a zone of gradually decreasing cross-sectional area, c. introducing the dispersion into a zone of gradually increasing cross-sectional area while effecting a reduction in the pressure of at least 75 percent thereby forming a standing shock wave in said zone of gradually increasing cross sectional area, d. passing said dispersion through said shock wave, and e. recovering from said zone of gradually increasing cross-sectional area a dispersion containing particles of reduced size, the rate of decrease of said decreasing cross-sectional area being greater than the rate of increase of said increasing cross-sectional area.
Claim 4
Dependent Claim
26 words
The process of claim 4 in which the standing shock wave is produced by regulating the pressure drop and the velocity drop of said flowing stream.
Claim 5
Dependent Claim
37 words
A method as described in claim 4, wherein a plurality of said streams are formed having at least one with said gradually increased cross-sectional area and directed to axially impinge against one another at a large angle.
Claim 6
Dependent Claim
22 words
A method as described in claim 6, wherein said streams are diametrically, axially impinged against each other at an angle of 180*.
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |