US4758333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sieve
Assignee: General Electric Co
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Filing: 1987-03-23
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Granted: 1988-07-19
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Expires: 2007-03-23
Abstract
Abstract A sieve is found useful for the separation of solid particles having substantially equal length and width dimensions from elongate shaped particles, comprising a corrugated sheet having sieve openings on the pitch between ridges and furrows of the corrugations and imperforate furrow bottoms.
Inventors
- 👤 Gregory M. Masica
- 👤 Eric J. Straub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:30
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/4609; B07B1/4654; B07B1/469; B07B13/00; B07B13/003
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
114 words
A sieve, which comprises; a corrugated sheet having an upper surface, a lower surface and a peripheral edge defining the outer perimeter of the sheet and located between upper and lower surfaces; said corrugated sheet having a plurality of alternating, parallel peaked ridges and furrows; the peaks of the ridges and the base of said furrows being joined by a pitched area of said sheet; each pitched area being perforated with a plurality of sieve openings adjacent to the ridge peaks; each pitched area having a zone below the perforations and adjacent to the base of said furrows which is imperforate; the imperforate areas being of a dimension and configuration to receive elongate particles.
Claim 2
Dependent Claim
114 words
A sieve, which comprises; a corrugated sheet having an upper surface, a lower surface and a peripheral edge defining the outer perimeter of the sheet and located between upper and lower surfaces; said corrugated sheet having a plurality of alternating, parallel peaked ridges and furrows; the peaks of the ridges and the base of said furrows being joined by a pitched area of said sheet; each pitched area being perforated with a plurality of sieve openings adjacent to the ridge peaks; each pitched area having a zone below the perforations and adjacent to the base of said furrows which is imperforate; the imperforate areas being of a dimension and configuration to receive elongate particles.
Claim 3
Dependent Claim
19 words
The sieve of claim 1 which further comprises means on the peripheral edge for mounting upon a sieve carrier.
Claim 4
Dependent Claim
13 words
The sieve of claim 2 wherein said means comprises an upwardly projecting flange.
Claim 5
Dependent Claim
20 words
The sieve of claim 1 wherein the pitch is at an angle of from 30° to 60° from the horizontal.
Claim 6
Independent Claim
223 words
A method of separating solid particles of substantially uniform length and width from solid particles having an elongate shape, which comprises; providing a sieve, which comprises; a corrugated sheet having an upper surface, a lower surface and a peripheral edge defining the outer perimeter of the sheet and located between upper and lower surfaces; said corrugated sheet having a plurality of alternating, parallel peaked ridges and furrows; the peaks of the ridges and the base of said furrows being joined by a pitched area of said sheet; the pitched area being perforated with a plurality of sieve openings adjacent to the ridge peaks; the pitched areas having a zone below the perforations and adjacent to the base of said furrows which is imperforate; the imperforate areas being of a dimension and configuration to receive elongate particles; wherein the openings will sieve out the solid particles of substantially uniform dimension, but not the elongate particles when presented to the opening along the elongate dimension; applying a mixture of solid particles of substantially uniform dimension with elongate shaped particles to the upper surface of the sieve; causing the applied mixture to flow across the upper surface of the sieve, in the direction of the furrows; and applying motion to the sieve in a plane parallel to the sieve surfaces; whereby separation of the mixture occurs.
Claim 7
Independent Claim
223 words
A method of separating solid particles of substantially uniform length and width from solid particles having an elongate shape, which comprises; providing a sieve, which comprises; a corrugated sheet having an upper surface, a lower surface and a peripheral edge defining the outer perimeter of the sheet and located between upper and lower surfaces; said corrugated sheet having a plurality of alternating, parallel peaked ridges and furrows; the peaks of the ridges and the base of said furrows being joined by a pitched area of said sheet; the pitched area being perforated with a plurality of sieve openings adjacent to the ridge peaks; the pitched areas having a zone below the perforations and adjacent to the base of said furrows which is imperforate; the imperforate areas being of a dimension and configuration to receive elongate particles; wherein the openings will sieve out the solid particles of substantially uniform dimension, but not the elongate particles when presented to the opening along the elongate dimension; applying a mixture of solid particles of substantially uniform dimension with elongate shaped particles to the upper surface of the sieve; causing the applied mixture to flow across the upper surface of the sieve, in the direction of the furrows; and applying motion to the sieve in a plane parallel to the sieve surfaces; whereby separation of the mixture occurs.
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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |