US4604111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particulate contamination control method and filtration device
Assignee: Gpac Inc
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Filing: 1985-05-20
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Granted: 1986-08-05
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Expires: 2005-05-20
Abstract
Abstract A negative pressure method and apparatus for protection from airborne asbestos and other particulate contamination is disclosed, including an enclosure with doorways and decontamination chambers with an air intake through the decontamination chambers with at least one filtration unit flow connected with the enclosure, with a blower to pull air into the filtration unit and dispelling the filtered air to the atmosphere. A high volume air flow intake is maintained with a significant negative air pressure in the enclosure. A filtration device is provided with multiple entrance ports providing for a large flow of air through the body of the room together with individual entrance ports to receive the discharge from separate vacuum cleaners.
Inventors
- 👤 Anthony Natale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:10
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/56; B01D46/62; B01D46/64; B01D46/10; B01D2273/00; B01D2273/28; B01D2275/00; B01D2275/30; B01D2275/305; Y; Y10; Y10S; Y10S160/00; Y10S160/08
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
135 words
A method of establishing a negative pressure environment within an existing building for removing dangerous solid materials from the building, said method comprising: (1) defining an enclosed space within said building using existing wall structure to define at least a portion of said enclosed space; (2) establishing at least one flow path for air to enter said enclosed space; (3) continuously evacuating air from said enclosed space through a filter means to remove dangerous solid materials from said evacuated air and to establish a negative air pressure in said enclosed space so that air exiting said space passes through said filter means; and (4) sealing said flow path against air exiting from said air space to the exterior of said enclosed space in the event of loss of negative air pressure in said enclosed space.
Claim 2
Independent Claim
135 words
A method of establishing a negative pressure environment within an existing building for removing dangerous solid materials from the building, said method comprising: (1) defining an enclosed space within said building using existing wall structure to define at least a portion of said enclosed space; (2) establishing at least one flow path for air to enter said enclosed space; (3) continuously evacuating air from said enclosed space through a filter means to remove dangerous solid materials from said evacuated air and to establish a negative air pressure in said enclosed space so that air exiting said space passes through said filter means; and (4) sealing said flow path against air exiting from said air space to the exterior of said enclosed space in the event of loss of negative air pressure in said enclosed space.
Claim 3
Dependent Claim
27 words
The method of claim 1, wherein the air evacuated from said enclosed space passes adjacent to a high level of dangerous solid materials within said enclosed space.
Claim 4
Dependent Claim
32 words
The method of claim 1, wherein the rate of evacuation of air from said enclosed space is sufficient to change the air within the enclosed space in about 5 to 25 minutes.
Claim 5
Dependent Claim
14 words
The method of claim 3, wherein the rate is about 10 to 20 minutes.
Claim 6
Dependent Claim
12 words
The method of claim 4, wherein the rate is about 15 minutes.
Claim 7
Dependent Claim
16 words
The method of claim 1, further comprising erecting temporary wall means to define said enclosed space.
Claim 8
Dependent Claim
12 words
The method of claim 1, wherein the enclosed space is essentially airtight.
Claim 9
Independent Claim
133 words
A system for establishing a favorable environment for removing dangerous solid materials, said system comprising: wall means enclosing a defined air space within a building, 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; filter means for filtering air in said air space; air moving means for producing a negative air pressure within said air space and for drawing air into said space through said inlet and for moving air through said filter means in advance of moving air through said outlet; and sealing means for sealing said inlet against air exiting from said air space to the exterior of said air space in the event of loss of negative air pressure in said air space.
Claim 10
Independent Claim
133 words
A system for establishing a favorable environment for removing dangerous solid materials, said system comprising: wall means enclosing a defined air space within a building, 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; filter means for filtering air in said air space; air moving means for producing a negative air pressure within said air space and for drawing air into said space through said inlet and for moving air through said filter means in advance of moving air through said outlet; and sealing means for sealing said inlet against air exiting from said air space to the exterior of said air space in the event of loss of negative air pressure in said air space.
Claim 11
Dependent Claim
49 words
The system of claim 8, further comprising a second inlet into said air space and a decontamination chamber communicating with the air space through said second inlet, said decontamination chamber including a first room, a second room, and a shower room interconnecting said first room and said second room.
Claim 12
Dependent Claim
41 words
The system of claim 9, further comprising a second decontamination chamber to facilitate removal of waste and equipment and intake means defined by said wall means to allow air flow to enter into the air space through the second decontamination chamber.
Claim 13
Dependent Claim
28 words
The system of claim 8, wherein said wall means includes at least one existing wall of said building and a temporary wall erected to enclose the air space.
Claim 14
Dependent Claim
40 words
The system of claim 8, wherein a barrier deflection means is placed in the air space to cause the air entering the air space to flow past the source of a high level of contamination before entering the filter means.
Claim 15
Dependent Claim
16 words
The system of claim 8, wherein the wall means comprises walls, a ceiling and a floor.
Claim 16
Dependent Claim
14 words
The system of claim 8, wherein the wall means comprises a flexible film wall.
Claim 17
Dependent Claim
12 words
The system of claim 8, wherein the air space is essentially airtight.
Claim 18
Dependent Claim
48 words
The system of claim 8, wherein the sealing means comprises a flexible film flap covering said inlet for essentially unobstructed air flow into the air space and for blocking air flow from the air space when there is a loss of negative air pressure in said air space.
Claim 19
Dependent Claim
33 words
The system of claim 16, wherein the inlet includes at least one opening of a size and shape to allow a person to step through said inlet covered by said flexible film flap.
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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) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |