Patent US4713181A successfully refreshed from Google Patents.
US4713181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for handling sludge
Assignee: NAPADOW STANLEY
•
Filing: 1986-03-18
•
Granted: 1987-12-15
•
Expires: 2006-03-18
Abstract
Abstract A method and apparatus in which a water sludge suspension is initially separated from the water by skimming and then is conveyed to a dewatering station at which the sludge is oscillated or vibrated to separate mechanically the water from the solid sludge material. Preferably, at the dewatering station, the sludge is dropped a predetermined distance onto a sieve, the impact of the falling sludge producing a squeezing action on the sludge to initially exude the occluded water. The sieve, which is inclined, is then oscillated or vibrated to work the sludge to further exude water therefrom and to urge the sludge down the inclined surface of the sieve. After traveling to the bottom of the sieve, the sludge, now substantially dewatered, is received by a container for disposal.
Inventors
- 👤 Frederick E. Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:11
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/0012; B01D21/02; B01D21/24; B01D21/2433; B01D35/00; B01D35/20; B01D35/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
176 words
An apparatus for separating and dewatering floating wet sticky, agglomerated paint sludge from a body of water and for dewatering the wet sludge to a dried sludge, said apparatus comprising means for providing a paint sludge sufficiently dry for enabling open transport and placement thereof in unlined landfills, including, a skimmer device having inlet means for connection to a reservoir to receive water bearing the sticky paint sludge and having a skimmer for skimming floating sticky paint sludge from the water and for discharging the skimmed sticky paint wet sludge, a porous conveyor means having a porous flexible screen receiving the wet paint sludge from said skimmer device and for conveying the wet sticky paint sludge, a supply roll of said porous flexible screen being wound in a roll and being unwound to provide a clean portion of screen to receive the wet sticky paint sludge, and means to impart a squeezing action on the wet sticky paint sludge to squeeze sufficient water therefrom to cause reclassification of the wet paint sludge to dry paint sludge.
Claim 2
Independent Claim
176 words
An apparatus for separating and dewatering floating wet sticky, agglomerated paint sludge from a body of water and for dewatering the wet sludge to a dried sludge, said apparatus comprising means for providing a paint sludge sufficiently dry for enabling open transport and placement thereof in unlined landfills, including, a skimmer device having inlet means for connection to a reservoir to receive water bearing the sticky paint sludge and having a skimmer for skimming floating sticky paint sludge from the water and for discharging the skimmed sticky paint wet sludge, a porous conveyor means having a porous flexible screen receiving the wet paint sludge from said skimmer device and for conveying the wet sticky paint sludge, a supply roll of said porous flexible screen being wound in a roll and being unwound to provide a clean portion of screen to receive the wet sticky paint sludge, and means to impart a squeezing action on the wet sticky paint sludge to squeeze sufficient water therefrom to cause reclassification of the wet paint sludge to dry paint sludge.
Claim 3
Dependent Claim
25 words
An apparatus in accordance with claim 1 including means to rewind the porous flexible screen into a roll after the dewatering of the paint sludge.
Claim 4
Independent Claim
139 words
A method of separating sticky tacky paint sludge floating in a body of water and dewatering the wet paint sludge to reclassify the wet paint sludge as dried sludge, said method comprising the steps of: providing paint sludge sufficiently dry for enabling open transport transport and placement thereof in unlined landfills, by skimming floating wet paint sludge from a body of water in a skimmer device, discharging the skimmed wet paint sludge onto a fresh porous screen conveyor belt, unwinding a roll of porous screen conveyor belt from a supply roll and moving the unwound screen to receive the discharging skimmed wet paint sludge, and squeezing the wet paint sludge while on the porous screen to squeeze water from the wet paint sludge to cause reclassification of the wet paint sludge from a wet sludge to a dry sludge.
Claim 5
Independent Claim
139 words
A method of separating sticky tacky paint sludge floating in a body of water and dewatering the wet paint sludge to reclassify the wet paint sludge as dried sludge, said method comprising the steps of: providing paint sludge sufficiently dry for enabling open transport transport and placement thereof in unlined landfills, by skimming floating wet paint sludge from a body of water in a skimmer device, discharging the skimmed wet paint sludge onto a fresh porous screen conveyor belt, unwinding a roll of porous screen conveyor belt from a supply roll and moving the unwound screen to receive the discharging skimmed wet paint sludge, and squeezing the wet paint sludge while on the porous screen to squeeze water from the wet paint sludge to cause reclassification of the wet paint sludge from a wet sludge to a dry sludge.
Claim 6
Dependent Claim
24 words
The method of claim 3 including the step of: rewinding the flexible porous screen into a roll after the dewatering of the paint sludge.
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) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |