US3756400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for sifting out fine particles by utilizing supersonic vibration
Assignee: Nippon Steel Corp
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Filing: 1971-08-09
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Granted: 1973-09-04
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Expires: 1991-08-09
Abstract
Abstract Method and apparatus for sifting out fine particles according to their original sizes, into which apparently larger-sized particles formed by the cohesion of such fine particles have been split by applying supersonic vibration in the solution, such sifting-out being carried out by applying supersonic vibration also to a set of the sieves of one or more mesh sizes.
Inventors
- 👤 O Kammori
- 👤 I Taguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:59
CPC Classifications
B; B03; B03B; B03B13/00; B07; B07B; B07B1/00; B07B1/28; B07B1/40; B07B2230/00; B07B2230/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
An apparatus for sifting out fine particles by utilizing supersonic vibration, comprising: a container adapted to receive a suspension containing fine particles to be sifted out, a sieve means fitted in the container, said sieve means comprising a metal filter having a multiplicity of mesh openings of a definite size in a fixed plane, and a supersonic transmitter having the shape of a truncated cone and placEd in said container, the transmitter having a plane tip surface which is larger than the effective area of said metal filter and located near the upper surface of the filter in parallel therewith.
Claim 2
Independent Claim
100 words
An apparatus for sifting out fine particles by utilizing supersonic vibration, comprising: a container adapted to receive a suspension containing fine particles to be sifted out, a sieve means fitted in the container, said sieve means comprising a metal filter having a multiplicity of mesh openings of a definite size in a fixed plane, and a supersonic transmitter having the shape of a truncated cone and placEd in said container, the transmitter having a plane tip surface which is larger than the effective area of said metal filter and located near the upper surface of the filter in parallel therewith.
Claim 3
Dependent Claim
36 words
An apparatus as claimed in claim 1 wherein said sieve means comprises a plurality of metal filters superposed in steps spaced sufficiently close for said suspension to fill the space between the filters continuously by capillarity.
Claim 4
Dependent Claim
17 words
An apparatus as claimed in claim 2 wherein the metal filter spacing does not exceed 2 mm.
Claim 5
Dependent Claim
69 words
An apparatus as claimed in claim 1 wherein said container is divided into an upper and a lower portion, the filter is interposed between said container portions, and the lower end of the upper container portion has an inner diameter smaller than the effective diameter of the filter while the upper end of the lower container portion has an inner diameter larger than the effective diameter of the filter.
Claim 6
Independent Claim
137 words
A method of sifting out fine particles by utilizing supersonic vibration, which comprises; preparing a suspension by mixing a powdery substance with a liquid in which the substance is insoluble, placing the thus prepared suspension in a container having a sifting device therein with at least two filters superposed and spaced sufficiently closely to one another that said suspension fills the space between said two filters spontaneously due to capillary action, and placing a supersonic transmitter in said container near the upper surface of the uppermost filter and operating said transmitter for imparting a supersonic vibration having a frequency of 10 to 100 KC to the filters through the suspension between the transmitter and the uppermost filter and the suspension between the filters, whereby fine particles are sifted from said suspension as it passes through the filters.
Claim 7
Independent Claim
137 words
A method of sifting out fine particles by utilizing supersonic vibration, which comprises; preparing a suspension by mixing a powdery substance with a liquid in which the substance is insoluble, placing the thus prepared suspension in a container having a sifting device therein with at least two filters superposed and spaced sufficiently closely to one another that said suspension fills the space between said two filters spontaneously due to capillary action, and placing a supersonic transmitter in said container near the upper surface of the uppermost filter and operating said transmitter for imparting a supersonic vibration having a frequency of 10 to 100 KC to the filters through the suspension between the transmitter and the uppermost filter and the suspension between the filters, whereby fine particles are sifted from said suspension as it passes through the filters.
Claim 8
Dependent Claim
23 words
A method as claimed in claim 5 wherein said supersonic transmitter is positioned about 0.5 cm above the upper surface of the sieve.
References Cited (Backward Citations)
US2785768A
Cited
US3305481A
Cited
US3366234A
Cited
US3490584A
Cited
US3472202A
Cited
US3463321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |