US3703237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential-effect backing vat for coarse and fine particles
Assignee: Bureau de Recherches Géologiques et Minières
•
Filing: 1971-01-07
•
Granted: 1972-11-21
•
Expires: 1991-01-07
Abstract
Abstract A method and apparatus for gravimetrically separating particles of different sizes and densities. A conical, liquid filled vat is closed at its smaller bottom opening by a rigid, flexibly mounted diaphragm and at its larger top opening by a flexibly mounted filter bed having a permeable bottom. The diaphragm and bed are rigidly connected and reciprocably driven along a vertical axis. The differential liquid flow promotes the migration of denser particles through the bed and into the vat.
Inventors
- 👤 Richard Cohen-Alloro
- 👤 Roger Cuvillier
- 👤 Jean Grassaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:06
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/02; B03B5/10; B03B5/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
An apparatus for the gravimetric separation of granular or pulverulent materials, comprising: a. a vertically oriented container having top and bottom openings, the top opening having a larger cross-sectional area than the bottom opening, b. a movable member sealingly connected by elastic means to the bottom opening, c. driving means for imparting a reciprocating vertical movement to the movable member, d. a basket member having a horizontal floor that is permeable to both liquid filling the container and to particles to be separated from the granular or pulverulent material, e. elastic means for sealingly connecting the basket member to the top opening of the container, f. means rigidly connecting the basket member to the movable member for movement therewith, and g. a tank surrounding the container and containing liquid at a level sufficient to cover the basket member.
Claim 2
Independent Claim
138 words
An apparatus for the gravimetric separation of granular or pulverulent materials, comprising: a. a vertically oriented container having top and bottom openings, the top opening having a larger cross-sectional area than the bottom opening, b. a movable member sealingly connected by elastic means to the bottom opening, c. driving means for imparting a reciprocating vertical movement to the movable member, d. a basket member having a horizontal floor that is permeable to both liquid filling the container and to particles to be separated from the granular or pulverulent material, e. elastic means for sealingly connecting the basket member to the top opening of the container, f. means rigidly connecting the basket member to the movable member for movement therewith, and g. a tank surrounding the container and containing liquid at a level sufficient to cover the basket member.
Claim 3
Independent Claim
138 words
An apparatus for the gravimetric separation of granular or pulverulent materials, comprising: a. a vertically oriented container having top and bottom openings, the top opening having a larger cross-sectional area than the bottom opening, b. a movable member sealingly connected by elastic means to the bottom opening, c. driving means for imparting a reciprocating vertical movement to the movable member, d. a basket member having a horizontal floor that is permeable to both liquid filling the container and to particles to be separated from the granular or pulverulent material, e. elastic means for sealingly connecting the basket member to the top opening of the container, f. means rigidly connecting the basket member to the movable member for movement therewith, and g. a tank surrounding the container and containing liquid at a level sufficient to cover the basket member.
Claim 4
Independent Claim
138 words
An apparatus for the gravimetric separation of granular or pulverulent materials, comprising: a. a vertically oriented container having top and bottom openings, the top opening having a larger cross-sectional area than the bottom opening, b. a movable member sealingly connected by elastic means to the bottom opening, c. driving means for imparting a reciprocating vertical movement to the movable member, d. a basket member having a horizontal floor that is permeable to both liquid filling the container and to particles to be separated from the granular or pulverulent material, e. elastic means for sealingly connecting the basket member to the top opening of the container, f. means rigidly connecting the basket member to the movable member for movement therewith, and g. a tank surrounding the container and containing liquid at a level sufficient to cover the basket member.
Claim 5
Dependent Claim
102 words
An apparatus as recited in claim 1 further comprising: a. a breakwater wall secured to the tank and suspended in the liquid above the basket member, the basket member having an outer wall aligned with the breakwater wall, b. a charging hopper for supplying granular or pulverulent material to be separated to the basket member, c. a second liquid container connected to the vertically oriented container at a position between the basket member and the movable member by a flexible and deformable conduit, and d. valve means within the second container for regulating the flow of liquid into the vertically oriented container.
Claim 6
Dependent Claim
28 words
An apparatus as recited in claim 1 wherein the driving means includes a cam profiled to cause a gradual rise and a rapid fall of the movable member.
Claim 7
Dependent Claim
65 words
An apparatus as recited in claim 1 wherein: a. the movable member has an inclined bottom with an opening therein for the discharge of dense particles that have been separated out through the basket member, and b. the tank has an inclined bottom with an opening therein for the discharge of dense particles that have moved across the top of and overflowed the basket member.
Claim 8
Independent Claim
101 words
A method for the gravimetric separation of granular or pulverulent materials, comprising: a. forming a layer of granular or pulverulent materials in a basket member having a permeable bottom and being sealingly and flexibly connected to the top opening of a vertically oriented, liquid filled container, b. imparting a reciprocating vertical motion to a rigid member sealingly and flexibly connected to the bottom opening of the container, said bottom opening having a smaller cross-sectional area than said top opening, and c. simultaneously imparting said reciprocating vertical motion to the basket member in synchronization with the motion imparted to the rigid member.
Claim 9
Independent Claim
101 words
A method for the gravimetric separation of granular or pulverulent materials, comprising: a. forming a layer of granular or pulverulent materials in a basket member having a permeable bottom and being sealingly and flexibly connected to the top opening of a vertically oriented, liquid filled container, b. imparting a reciprocating vertical motion to a rigid member sealingly and flexibly connected to the bottom opening of the container, said bottom opening having a smaller cross-sectional area than said top opening, and c. simultaneously imparting said reciprocating vertical motion to the basket member in synchronization with the motion imparted to the rigid member.
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |