Patent US5064457A successfully refreshed from Google Patents.
US5064457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particulate containment control system
Assignee: VWE Inc 2107 N MARGARET N ST PAUL MN 55109 A CORP OF
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Filing: 1991-02-01
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Granted: 1991-11-12
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Expires: 2011-02-01
Abstract
Abstract A negative pressure control system for protection from airborne asbestos particles, gases and the like from a work space includes an enclosure formed of portable rigid doorway panels and doors with transoms communicating with the work space and defining an air intake and decontamination chambers, an exhaust unit having a blower and HEPA filter is positioned in the work space and discharges to the atmosphere and maintains a suitable negative air pressure in the work space and a substantial flow of air through the work space and the decontamination chambers. The enclosure may comprise a room divider and/or a temporary room in communication with the work space. The doors are normally closed as by spring action and the transom closures open responsive to air flow towards the work space and closes with the loss of negative air pressure within the work space.
Inventors
- 👤 Victor Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:21
CPC Classifications
B; B08; B08B; B08B15/00; B08B15/02; B08B15/026; E; E04; E04H; E04H1/00; E04H1/12; E04H1/1277
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
259 words
In a system for establishing a favorable environment for removing dangerous particulate forming solid materials, including asbestos, said system comprising; wall means defining a work space and enclosing an air space communicating with said work space, said wall means including at least one inlet for air to enter said air space and an outlet for air to exit from said air space, said air space defining at least one decontamination chamber, a filter and air moving means for producing a negative air pressure within said work space and for drawing air into said work space through said inlet and for moving air through said filter and said outlet, the improvement comprising; said wall means consisting of a plurality of rigid doorway panels and plastic film, doorways in said rigid doorway panels, doors in said doorways, transoms in said rigid panels, movable closures in said transoms, a HEPA filter within said closure, means for moving said HEPA filter within said closure, means urging said doors to closed position in said doorways, a plurality of tubing registering in openings in said rigid doorway panels so as to hold said rigid doorway panels upright and in spaced relation to one another, said plastic film positioned around said rigid doorway panels and said tubing sections to form a continuous wall defining at least one enclosure, means for sealing said plastic film to some of said rigid doorway panels, means for urging said closures in said transom to closed position, an air moving means acting to move said closures to open position when operating.
Claim 2
Dependent Claim
259 words
In a system for establishing a favorable environment for removing dangerous particulate forming solid materials, including asbestos, said system comprising; wall means defining a work space and enclosing an air space communicating with said work space, said wall means including at least one inlet for air to enter said air space and an outlet for air to exit from said air space, said air space defining at least one decontamination chamber, a filter and air moving means for producing a negative air pressure within said work space and for drawing air into said work space through said inlet and for moving air through said filter and said outlet, the improvement comprising; said wall means consisting of a plurality of rigid doorway panels and plastic film, doorways in said rigid doorway panels, doors in said doorways, transoms in said rigid panels, movable closures in said transoms, a HEPA filter within said closure, means for moving said HEPA filter within said closure, means urging said doors to closed position in said doorways, a plurality of tubing registering in openings in said rigid doorway panels so as to hold said rigid doorway panels upright and in spaced relation to one another, said plastic film positioned around said rigid doorway panels and said tubing sections to form a continuous wall defining at least one enclosure, means for sealing said plastic film to some of said rigid doorway panels, means for urging said closures in said transom to closed position, an air moving means acting to move said closures to open position when operating.
Claim 3
Dependent Claim
38 words
The apparatus of claim 1 wherein some of said tubing sections are positioned between said rigid doorway panels and the remainder of said tubing sections extend outwardly from a rigid panel to rest on a horizontal supporting surface.
Claim 4
Dependent Claim
66 words
The apparatus of claim 1 wherein a plurality of said rigid doorway panels having doorways therein and doors in said doorways and transoms and closures in said transoms are arranged in a structure to define at least three decontamination chambers in a row with the transom on one end forming said air inlet and the transom on the other opposite end communicating with said work space.
Claim 5
Dependent Claim
37 words
The apparatus of claim 1 wherein said rigid doorway panels, closures in said transoms, and said tubing are of a plastic resin material having an oxygen index of over 17 tested under ASTM, D-2863 fire resistant rating.
Claim 6
Dependent Claim
54 words
The apparatus of claim 1 wherein said means urging said closures in said transoms to closed position consist of weights on said closure, said weights bein of a known size so as to counter-weight the closures to move the same to closed position upon loss of said negative air pressure in said work space.
Claim 7
Dependent Claim
57 words
The apparatus of claim 5 wherein said weights on said doors consist of a movable HEPA filter mounted in said closure communicating with said work space, said HEPA filter of a known size so as to counter-weight the closure to move the same to closed position upon loss of said negative air pressure in said work space.
Claim 8
Dependent Claim
36 words
The apparatus of claim 1 wherein said means for sealing said plastic film to some of said rigid doorway panels comprises a continuous locking channel in said panels, a resilient spline registering in said locking channel.
Claim 9
Dependent Claim
33 words
The apparatus of claim 1 wherein said rigid doorway panels comprise a perimeter frame element and a interior doorway, door and transom frame element, rigid lightweight plastic resin sheets interconnecting said framing elements.
Claim 10
Dependent Claim
34 words
The apparatus of claim 8 wherein said doorway, door and transom frame element comprises an angularly outer surface, oppositely disposed upstanding extensions, said extensions having angularly disposed surfaces engaging said rigid lightweight resin sheets.
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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) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |