US4804392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clean air facility
Assignee: Individual
•
Filing: 1987-09-17
•
Granted: 1989-02-14
•
Expires: 2007-09-17
Abstract
Abstract An environmental clean air facility formed of a clear vinyl material secured to a frame formed by PVC pipes and fittings so that the clear vinyl material may be formed and draped over or attached to the frame to form a clean air enclosure. A power unit section including a blower motor having a prefilter unit on opposite ends through which air is drawn from the surrounding medium and directs the air through a HEPA filter, through an air delivery duct and into or out of the enclosure. The frame may be used for delivering air to the room or exhausting air from the room.
Inventors
- 👤 Charles W. Spengler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:03
CPC Classifications
B; B01; B01L; B01L1/00; B01L1/04; F; F24; F24F; F24F3/00; F24F3/12; F24F3/16; F24F3/163; F24F3/167
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
153 words
A portable clean air facility which includes: a support frame; said support frame including front and rear end vertically directed spaced uprights and horizontally directed spaced upper cross pieces that separate said front end from said rear end; an enclosure including an upper panel, a front end panel, a rear end panel and opposite side panels each formed by clear vinyl sheeting adapted to be secured to each other in an air tight manner by use of compatible fastening means and secured to said support frame; at least one door formed of a vinyl sheet secured to an opening in one of said panels by use of Velcro applied to edges of said opening and said vinyl sheet; said enclosure includes a tee-shaped footer for securing said enclosure to a supporting floor and for admitting or exhausting air from said enclosure; and means for directing clean air into or out of said enclosure.
Claim 2
Dependent Claim
153 words
A portable clean air facility which includes: a support frame; said support frame including front and rear end vertically directed spaced uprights and horizontally directed spaced upper cross pieces that separate said front end from said rear end; an enclosure including an upper panel, a front end panel, a rear end panel and opposite side panels each formed by clear vinyl sheeting adapted to be secured to each other in an air tight manner by use of compatible fastening means and secured to said support frame; at least one door formed of a vinyl sheet secured to an opening in one of said panels by use of Velcro applied to edges of said opening and said vinyl sheet; said enclosure includes a tee-shaped footer for securing said enclosure to a supporting floor and for admitting or exhausting air from said enclosure; and means for directing clean air into or out of said enclosure.
Claim 3
Dependent Claim
21 words
A clean air facility as claimed in claim 1, in which said support frame is formed of PVC tubing and fittings.
Claim 4
Dependent Claim
23 words
A clean air facility as claimed in claim 1, which includes an air filter blower for directing air into or from said enclosure.
Claim 5
Dependent Claim
23 words
A clean air facility as claimed in claim 2, which includes an air filter blower for direction air into or from said enclosure.
Claim 6
Dependent Claim
50 words
A portable clean air facility as set forth in claim 2 in which; said PVC tubing is used for applying a negative or positive pressure to said clean air facility by pumping air from said clean air facility or adding air to said clean air facility through said PVC tubing.
Claim 7
Dependent Claim
25 words
A clean air facility as claimed in claim 1, in which: said enclosure includes a false ceiling through which air is directed into said enclosure.
Claim 8
Dependent Claim
25 words
A clean air facility as claimed in claim 1, in which: said enclosure includes a false ceiling through which air is directed into said enclosure.
Claim 9
Dependent Claim
25 words
A clean air facility as claimed in claim 1, in which: said upper panel includes spaced apertures through which air is directed into said enclosure.
Claim 10
Dependent Claim
25 words
A clean air facility as claimed in claim 1, in which: said upper panel includes spaced apertures through which air is directed into said enclosure.
Claim 11
Dependent Claim
21 words
A clean air facility as set forth in claim 1, which includes: an air lock through which said enclosure is entered.
Claim 12
Dependent Claim
21 words
A clean air faciltiy as set forth in claim 3, which includes: an air lock through which said enclosure is entered.
Claim 13
Dependent Claim
36 words
A clean air facility as set forth in claim 1, in which: said means for directing air into said enclosure is a filter-blower on the outside of said enclosure and connected thereto by a vinyl hose.
Claim 14
Dependent Claim
40 words
A clean air facility as set forth in claim 1, in which: said means for directing air from said enclosure is a filter-blower on the inside of said enclosure and connected to a panel for forcing air from said enclosure.
Claim 15
Dependent Claim
24 words
A clean air facility as set forth in claim 10, in which said air lock is subjected to a negative pressure on its inside.
Claim 16
Dependent Claim
24 words
A clean air facility as set forth in claim 10, in which said air lock is subjected to a positive pressure on its inside.
Claim 17
Dependent Claim
37 words
A portable clean air facility as set forth in claim 1 which includes; at least one separate clean air room housed within said portable clean air facility, said clean air room including a separate filter-air blower unit.
Claim 18
Dependent Claim
33 words
A portable clean air facility as set forth in claim 16 in which; said clean air facility is at a positive pressure and said clean air room therein is at a negative pressure.
Claim 19
Dependent Claim
33 words
A portable clean air facility as set forth in claim 16 in which said clean air facility is at a negative pressure and said clean air room therein is at a positive pressure.
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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) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |