US3726203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for maintenance of a dustfree, bacteria-free zone in a room
Assignee: Svenska Flaktfabriken AB
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Filing: 1971-06-23
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Granted: 1973-04-10
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Expires: 1991-06-23
Abstract
Abstract A device for maintenance of a dust and bacterial free zone in a room by means of one or more nozzles having a number of preferably straight sides and meeting in a corresponding number of corners and placed one beside the other so as to produce a corresponding number of curtains surrounding the zone, w h e r e i n an impulse means is arranged to produce separately a preferably rather more powerful jet of air in each of said corners between the pairwise meeting exhaust nozzles for ensuring an unbroken air curtain around the zone also in the corners.
Inventors
- 👤 L Lindestrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:27
CPC Classifications
A; A61; A61G; A61G13/00; A61G13/10; A61G13/108; A61G10/00; A61G10/02; F; F24; F24F; F24F9/00; F24F2009/002; Y; Y10; Y10S; Y10S55/00; Y10S55/29
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
A device for the maintenance of a dustfree and bacteriafree zone in a room by forming a plurality of air curtains surrounding the zone and supplying ventilating air to the curtained-off zone, said device including means for uniformly distributing ventilating air to within the zone, and means for forming said air curtains around the zone comprising a distributing channel surrounding the zone and having a number of sides which meet at corners; nozzles opening out of said channel in each side, said nozzles being coextensive with said sides and adjoining one another in each of said corners to produce an air curtain on each side to curtain off the zone, and impulse means at each corner to produce a more powerful jet of air along the junction of the curtains emanating from the adjoining sides of the distributing channel to balance by ejector action the forces of contraction of the adjacent air curtains and for insuring an unbroken air curtain around the zone including the corners.
Claim 2
Independent Claim
166 words
A device for the maintenance of a dustfree and bacteriafree zone in a room by forming a plurality of air curtains surrounding the zone and supplying ventilating air to the curtained-off zone, said device including means for uniformly distributing ventilating air to within the zone, and means for forming said air curtains around the zone comprising a distributing channel surrounding the zone and having a number of sides which meet at corners; nozzles opening out of said channel in each side, said nozzles being coextensive with said sides and adjoining one another in each of said corners to produce an air curtain on each side to curtain off the zone, and impulse means at each corner to produce a more powerful jet of air along the junction of the curtains emanating from the adjoining sides of the distributing channel to balance by ejector action the forces of contraction of the adjacent air curtains and for insuring an unbroken air curtain around the zone including the corners.
Claim 3
Dependent Claim
66 words
Device according to claim 1 having a single nozzle extending along the length of each side of said distributing channel to provide a single air curtain therealong characterized in that, at each corner the impulse means consists of a circular hole for exhaust of a separate air jet, keeping together the adjoining air curtains, and placed at each point of intersection between the adjoining exhaust nozzles.
Claim 4
Dependent Claim
29 words
A device according to claim 1 wherein said sides are straight and said nozzles on opposite sides of said zone provide curtains which diverge away from said distributing channel.
Claim 5
Dependent Claim
79 words
Device according to claim 1 including inlet means for introducing air into said channel and a strip extending partially across the distributing channel intermediate said inlet and said nozzles to form a slot adjacent a side wall of the channel, said strip extending along the entire length of each side of said channel, said slot being wider than the width of said nozzles to insure flow of air from said inlet supply through the entire length of said nozzles.
Claim 6
Dependent Claim
48 words
Device according to claim 4 including a second strip disposed perpendicular to said first strip intermediate said slot and said nozzles forming a second longitudinal slot extending along the entire length of each side of said channel, said second slot beinG wider than the width of said nozzles.
Claim 7
Dependent Claim
56 words
Device according to claim 1 having a pair of laterally-spaced parallel inner and outer nozzles extending along each side of said distributing channel to provide a double air curtains therealong, characterized in that, at each corner the impulse means comprises a diagonal slot extending between the points of intersection of the inner and outer exhaust nozzles.
Claim 8
Dependent Claim
34 words
Device according to, claim 1 characterized in that the exhaust nozzles are formed as pairs of parallel strips attached to one another at a number of points with accurately matched, equally thick circular spacers.
References Cited (Backward Citations)
US3380369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |