US3703801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clean air work station
Assignee: Dexon Inc
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Filing: 1971-04-05
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Granted: 1972-11-28
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Expires: 1991-04-05
Abstract
Abstract A clear air work station having a horizontal work surface on which is disposed a bell jar having means for evacuating the jar. Filtered air is delivered horizontally over the region above the work surface and a shield secured to the bell jar prevents the filtered air from engaging the bell jar except for the lower portion of the jar immediately adjacent the work panel. When the jar is raised to get access to the material being worked on within the jar, the shield is simultaneously raised to allow filtered air to flow beneath the jar. By reason of the shield, air turbulence around the jar is eliminated. Since the shield moves with the jar, the total flow of filtered air remains constant regardless of the position of the bell jar.
Inventors
- 👤 Peter C Deckas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:56
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/12; F24F3/16; F24F3/163; B; B08; B08B; B08B15/00; B08B15/02; Y; Y10; Y10S; Y10S55/00; Y10S55/29
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
187 words
A clean air work station comprising: a cabinet having a horizontal work panel disposed above the floor and forming a horizontally disposed work surface, said cabinet having a portion extending substantially vertically behind and above said work surface and having a chamber therein forming a plenum chamber with an opening in the front of said chamber, laminar filter means secured in said opening directing in a generally horizontal direction any air flowing therethrough, means associated with said cabinet for forcing air into said plenum chamber and out through said filter means, an object disposed on said work surface and projecting a substantial distance thereabove, means for raising said object above said work surface, a shield disposed between said filter means and said object for substantially preventing the air passing through said plenum chamber from engaging said object and thus creating turbulent air flow in the space adjacent said object, and means effective when said object is raised to cause said shield to be moved with respect to said filter means to allow filtered air to flow through the space above said work surface and beneath said object.
Claim 2
Dependent Claim
187 words
A clean air work station comprising: a cabinet having a horizontal work panel disposed above the floor and forming a horizontally disposed work surface, said cabinet having a portion extending substantially vertically behind and above said work surface and having a chamber therein forming a plenum chamber with an opening in the front of said chamber, laminar filter means secured in said opening directing in a generally horizontal direction any air flowing therethrough, means associated with said cabinet for forcing air into said plenum chamber and out through said filter means, an object disposed on said work surface and projecting a substantial distance thereabove, means for raising said object above said work surface, a shield disposed between said filter means and said object for substantially preventing the air passing through said plenum chamber from engaging said object and thus creating turbulent air flow in the space adjacent said object, and means effective when said object is raised to cause said shield to be moved with respect to said filter means to allow filtered air to flow through the space above said work surface and beneath said object.
Claim 3
Dependent Claim
14 words
The work station of claim 1 in which the object is a bell jar.
Claim 4
Dependent Claim
45 words
The work station of claim 1 in which the shield when in its operative position is spaced slightly above said work surface for allowing limited air flow to engage said object immediately above said work surface to sweep said work surface free of foreign particles.
Claim 5
Dependent Claim
34 words
The work station of claim 1 in which said shield has a vertical portion extending between said inverted chamber and said filter means and a further portion extending at least partially over said chamber.
Claim 6
Dependent Claim
47 words
The work station of claim 1 in which said opening and said laminar filter means extend upwardly to a point above the uppermost point of movement of said object so that even when said object is in its uppermost position filtered air flows across the top thereof.
Claim 7
Dependent Claim
51 words
The work station of claim 5 in which said shield is secured to said inverted chamber and is movable therewith so that as said object is raised said shield is likewise raised to maintain constant the total obstruction presented by said object and said shield to the flow of filtered air.
Claim 8
Dependent Claim
45 words
The work station of claim 1 in which the object is a bell jar and in which there is means disposed beneath said work surface for evacuating said bell jar for performing therein operations on work pieces which operations must be performed under a vacuum.
Claim 9
Dependent Claim
50 words
The work station of claim 7 in which the shield is in the form of an angular plate having a substantially vertical leg extending between said bell jar and said filter means and a horizontal leg extending above and secured to said jar to support said shield on said jar.
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |