Patent US4909974A successfully refreshed from Google Patents.
US4909974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of multilayer blocks suitable for the production of slabs without the use of a sawing machine
Assignee: Individual
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Filing: 1988-03-23
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Granted: 1990-03-20
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Expires: 2008-03-23
Abstract
Abstract A process for the production of a multi-layer block by distribution of a mixture, the block being used for the production of agglomerated slabs of marble, granite, sand or in general stone, consists of weighing a predetermined amount of the mixture, mixing it to render it homogeneous, conveying the predetermined amount of homogeneous mixture into a mold provided with a vertically movable bottom, subjecting the mixture to a vibrating action by means of a vibrating plate, then lowering said predetermined amount of the mixture of a distance equal to the thickness of a new slab, covering the mixture with a sheet of impermeable material, repeating the operations until the mold is filled. A multi-layer block is formed, which is compacted and allowed to set. The block is separated into slabs corresponding to the sheets of impermeable material. The apparatus is also described.
Inventors
- 👤 Luca Toncelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:43
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/0088; B28B1/00; B28B1/08; B28B1/093; B28B11/00; B28B11/14; B28B13/00; B28B13/02; B28B13/0215; B28B13/022; B28B13/023; B28B13/0235; B28B23/00; B28B23/0056; B28B3/00; B28B3/02; B28B3/021; B28B3/022; B28B3/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
The process for the production of a multi-layer block from a mixture of marble, stone, granite, sand, and the like, with a binder which consists of the steps of: (1) conveying said mixture into a distributor, said distributor having a weighing device for weighing the amount of said mixture, (2) mixing said weighed mixture in said distributor to obtain an homogeneous mixture, (3) conveying said weighed homogeneous mixture into a mold provided with a vertically movable bottom, (4) subjecting said mixture to a vibrating action by means of a vibrating plate, (5) lowering said mixture a distance equal to the thickness of a single layer, (6) covering said layer with a sheet of impermeable material, and (7) repeating said steps (1)-(6) until said mold is filled, whereby a multi-layer block is formed with each layer covered by a sheet of impermeable material, compacting, allowing said block to set and separating said layers by removing the sheets of impermeable material.
Claim 2
Dependent Claim
159 words
The process for the production of a multi-layer block from a mixture of marble, stone, granite, sand, and the like, with a binder which consists of the steps of: (1) conveying said mixture into a distributor, said distributor having a weighing device for weighing the amount of said mixture, (2) mixing said weighed mixture in said distributor to obtain an homogeneous mixture, (3) conveying said weighed homogeneous mixture into a mold provided with a vertically movable bottom, (4) subjecting said mixture to a vibrating action by means of a vibrating plate, (5) lowering said mixture a distance equal to the thickness of a single layer, (6) covering said layer with a sheet of impermeable material, and (7) repeating said steps (1)-(6) until said mold is filled, whereby a multi-layer block is formed with each layer covered by a sheet of impermeable material, compacting, allowing said block to set and separating said layers by removing the sheets of impermeable material.
Claim 3
Dependent Claim
14 words
The process according to claim 1 wherein said sheet of impermeable material is paper.
Claim 4
Dependent Claim
28 words
The process according to claim 1 wherein said mixture in step (3) is conveyed by said distributor to a location above the mold by means of a guide.
Claim 5
Dependent Claim
25 words
The process according to claim 3 wherein said guide moves back and forth, and the distributor is returned to its initial position during step (4).
Claim 6
Dependent Claim
23 words
The process according to claim 1 wherein said vibrating plate is lowered during step (4) and is then raised prior to step (6).
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) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |