US3817376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screening process and apparatus
Assignee: Individual
•
Filing: 1972-10-10
•
Granted: 1974-06-18
•
Expires: 1992-10-10
Abstract
Abstract A process for high-efficiency screening on vibrating apparatus of dry or moist granular or powdery substances, wherein the bed depth of the residue on the screening surface increases from a depth at an upstream point to a greater depth at a downstream point, due to the fact that the speed of advance of the residue and the width of the said surface are given values such that the product of the speed of advance and the width, decreases in proportion to the weight loss experienced by the residue between these two points and in inverse proportion to the increase in the bed depth between these same points.
Inventors
- 👤 E Burstlein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:24
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/28; B07B1/282
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
100 words
A method for screening a mixture of particles of different sizes advancing in the form of a continuous bed on a screening surface formed by successive sections having calibrated openings, vibrating said surface, thereby insuring the agitation of the bed and its onward movement, entirely feeding said mixture on the screening surface at the upstream end thereof, and reducing the product of speed of advancement of the bed by its breadth so that the ratio of the bed depths at the downstream end with respect to the upstream end of said screening surface is rendered at least equal to 1.
Claim 2
Independent Claim
100 words
A method for screening a mixture of particles of different sizes advancing in the form of a continuous bed on a screening surface formed by successive sections having calibrated openings, vibrating said surface, thereby insuring the agitation of the bed and its onward movement, entirely feeding said mixture on the screening surface at the upstream end thereof, and reducing the product of speed of advancement of the bed by its breadth so that the ratio of the bed depths at the downstream end with respect to the upstream end of said screening surface is rendered at least equal to 1.
Claim 3
Dependent Claim
73 words
A screening method according to claim 1 wherein the screening surface is of a constant breadth and the sections are similar, subjecting the sections to the same vibratory characteristics, and varying the downward and upward slopes of the sections to obtain the desired variations in speed for rendering the ratio of the bed depth at the downstream end with respect to the upstream end of the screening surface at least equal to 1.
Claim 4
Dependent Claim
62 words
A screening method according to claim 1 wherein the screening surface is of a constant breadth, subjecting the sections to different vibratory characteristics, and varying said vibratory characteristics to obtain the desired variations in speed for rendering the ratio of the bed depths at the downstream end with respect to the upstream end of the screening surface at least equal to 1.
Claim 5
Dependent Claim
72 words
A screening methoD according to claim 1 wherein the screening surface is of a constant breadth, subjecting the sections to different vibratory characteristics, both varying the downward and upward slopes of the sections and varying said vibratory characteristics to obtain the desired variations in speed for rendering the ratio of the bed depth at the downstream end with respect to the upstream end of the screening surface at least equal to 1.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |