Patent US4774974A successfully refreshed from Google Patents.
US4774974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for removing asbestos from structures
Assignee: Sasol North America Inc
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Filing: 1986-08-18
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Granted: 1988-10-04
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Expires: 2006-08-18
Abstract
Abstract A system and process for removing hazardous or toxic particulate materials from surfaces includes all components necessary for safe removal of the material in a van body that can be moved easily from one site to another. The system includes mechanism for sealing of selected areas, with tubing connecting the selected sealed areas to a separator chamber in the van body. Air pressure is lowered within the sealed enclosed area and airflow is maintained through the tube to the separator chamber. Fluidic carrier jets may also be directed within the tube toward the separator chamber. Particulate materials can be removed from the surface within the enclosure and deposited into the tube where it flows in an air and fluid carrier stream to the separator chamber. There, larger particulates are allowed to drop into a collection tank. Remaining particulate materials are filtered by a high efficiency particulate absolute filter until the air is safe to be discharged into the atmosphere. Airflow and pressure differential is produced by one or more of a series of valved fan units near a discharge end of the chamber. An auxiliary airflow tube and return air (make-up air) tube can also be connected between the chamber and enclosure.
Inventors
- 👤 Bruce W. Teter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:56
CPC Classifications
B; B08; B08B; B08B15/00; B08B15/02; B08B15/026; B09; B09B; B09B3/00; B09B3/30; B09B3/35; B09B2101/00; B09B2101/35
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
248 words
A system for safely removing hazardous or toxic materials from a surface, comprising: portable enclosure means securable to the surface for partially sealing an area about the material to be removed; an intake tube for receiving materials removed from the surface, including an intake end, opening into the enclosure means and a discharge end; a portable sealed separator chamber having an intake connectable to the discharge end of the intake tube and a chamber discharge; a collection tank enclosed within the portable sealed separator chamber adjacent the intake tube discharge end; a submicronic air filter assembly within the chamber between the collection tank and chamber discharge for filtering materials from air within the chamber prior to discharge from the separator chamber through the chamber discharge; air displacement means between the filter assembly and chamber discharge for reducing air pressure within the area sealed by the portable enclosure means and producing an intake airflow through the intake tube to carry removed materials from the portable enclosure means into the chamber to the collection tank, through the filters and subsequently forcibly discharge the filtered air out through the chamber discharge; and return air tube means for cycling at least a portion of the filtered air forcibly discharged through the chamber discharge to the portable enclosure means to provide make-up air to the area sealed by the portable enclosure means for recycling through the intake tube, said return air tube means leading from the chamber discharge to the portable enclosure means.
Claim 2
Independent Claim
248 words
A system for safely removing hazardous or toxic materials from a surface, comprising: portable enclosure means securable to the surface for partially sealing an area about the material to be removed; an intake tube for receiving materials removed from the surface, including an intake end, opening into the enclosure means and a discharge end; a portable sealed separator chamber having an intake connectable to the discharge end of the intake tube and a chamber discharge; a collection tank enclosed within the portable sealed separator chamber adjacent the intake tube discharge end; a submicronic air filter assembly within the chamber between the collection tank and chamber discharge for filtering materials from air within the chamber prior to discharge from the separator chamber through the chamber discharge; air displacement means between the filter assembly and chamber discharge for reducing air pressure within the area sealed by the portable enclosure means and producing an intake airflow through the intake tube to carry removed materials from the portable enclosure means into the chamber to the collection tank, through the filters and subsequently forcibly discharge the filtered air out through the chamber discharge; and return air tube means for cycling at least a portion of the filtered air forcibly discharged through the chamber discharge to the portable enclosure means to provide make-up air to the area sealed by the portable enclosure means for recycling through the intake tube, said return air tube means leading from the chamber discharge to the portable enclosure means.
Claim 3
Dependent Claim
23 words
The removal system of claim 1 further comprising laminar air flow baffles within the chamber between the collection tank and submicronic filter assembly.
Claim 4
Dependent Claim
41 words
The removal system of claim 2 further comprising: a first filter element adjacent the laminar flow baffles; and wherein the submicronic filter is a high efficiency particulate absolute filter and is positioned between the first filter and the air displacement means.
Claim 5
Dependent Claim
27 words
The removal system of claim 3 wherein the high efficiency particulate absolute filter is capable of removing particulates of 0.03 microns and larger for air passing therethrough.
Claim 6
Dependent Claim
41 words
The removal system of claim 1 further comprising jet means along the intake tube for directing jets of fluid into the intake tube in the direction of airflow to urge flow of materials within the intake tube toward the separator chamber.
Claim 7
Dependent Claim
38 words
The removal system of claim 5 wherein the intake tube is made up of several sections releasably joined at sealable joints and wherein the jet means includes a discharge nozzle within the intake tube at each sealable joint.
Claim 8
Dependent Claim
30 words
The removal system of claim 6 further comprising pump means on the chamber for supplying fluid at a pressure within the range of approximately 90-3000 psi to the jet means.
Claim 9
Dependent Claim
27 words
The removal system of claim 5 further comprising pump means for supplying fluid at a pressure within the range of approximately 90-3000 psi to the jet means.
Claim 10
Dependent Claim
31 words
The removal system of claim 1 wherein the air displacement means is comprised of: a fan; drive means for selectively operating the fan and an individual, controllable valve on the fan.
Claim 11
Dependent Claim
19 words
The removal system of claim 1 further comprising: grinder means in the intake tube adjacent the tube intake end.
Claim 12
Dependent Claim
28 words
The removal system of claim 1 wherein the collection tank includes a removable waterproof liner and a sealable drain for receiving water and material from the intake tube.
Claim 13
Dependent Claim
46 words
The removal system of claim 1 further comprising an elongated valved tube within the separator chamber above the collection tank having longitudinally spaced discharge openings; and means for selectively opening any one of the spaced openings to discharge air and material into the collection tank below.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |