Patent DE371637C successfully refreshed from Google Patents.
Patent US4925556A successfully refreshed from Google Patents.
US4925556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of floors for filters, and floors thus made
Assignee: Suez International SAS
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Filing: 1989-01-06
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Granted: 1990-05-15
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Expires: 2009-01-06
Abstract
Abstract A method for making floors for filters, particularly for filters including a granular filtrating material, wherein the method includes forming two stages. The first stage is made by casting in concrete or the equivalent, at least one carrier self-supporting element or pre-slab, formed with openings in which are housed elements, such as nozzles, for the introduction of fluids used for washing the filter. Then the second stage is formed, during which, once the carrier self-supporting elements have been put in position on the supports of the filter, concrete is cast in a single operation on this element or elements, in a quantity sufficient for reaching the required total thickness of the floor and thereby providing a slab which will receive the filter granular material.
Inventors
- 👤 Marie-Pierre Gaudin
- 👤 Daniel Meindre
- 👤 Vincent Savall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:16
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/001; B01D24/02; B01D24/20; B01D24/22; Y; Y10; Y10S; Y10S264/00; Y10S264/57
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A method for forming a floor for filters, particularly for filters including granular filtrating material, said method comprising: (a) forming a first stage of said floor by casting material into a plurality of pre-slabs having openings, said openings adapted to house nozzles for washing the filter; (b) positioning said pre-slabs on supports of the filter; and (c) casting material on said plurality of pre-slabs in a second stage to reach the required total thickness of the floor and to fill in any gaps between said pre-slabs, thereby providing a continuous slab to receive the granular filtrating material.
Claim 2
Independent Claim
97 words
A method for forming a floor for filters, particularly for filters including granular filtrating material, said method comprising: (a) forming a first stage of said floor by casting material into a plurality of pre-slabs having openings, said openings adapted to house nozzles for washing the filter; (b) positioning said pre-slabs on supports of the filter; and (c) casting material on said plurality of pre-slabs in a second stage to reach the required total thickness of the floor and to fill in any gaps between said pre-slabs, thereby providing a continuous slab to receive the granular filtrating material.
Claim 3
Dependent Claim
23 words
The method according to claim 1, wherein said first stage of said floor is formed from the cast material and a bottom layer.
Claim 4
Dependent Claim
23 words
The method according to claim 1, wherein the total thickness of said floor is at least twice the thickness of said first stage.
Claim 5
Dependent Claim
24 words
The method according to claim 1, further providing reinforcement means in said first stage to extend into the material cast in said second stage.
Claim 6
Dependent Claim
24 words
The method according to claim 1, further applying a bonding agent to the upper surface of said pre-slab prior to casting said second stage.
Claim 7
Dependent Claim
11 words
The method according to claim 1, wherein said material is concrete.
Claim 8
Dependent Claim
13 words
A floor for a filter, formed by the method according to claim 1.
References Cited (Backward Citations)
AT48331B
Cited
US1189521A
Cited
US1334729A
Cited
US1572398A
Cited
DE696980C
Cited
US2710692A
Cited
DE841443C
Cited
US3110667A
Cited
DE1302745B
Cited
US3403492A
Cited
US3456804A
Cited
US3808299A
Cited
US3956134A
Cited
DE2416870A1
Cited
DE2847076A1
Cited
FR2450310A1
Cited
FR2450626A1
Cited
US4774045A
Cited
FR2596385A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |