US4776263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for a suspended ceiling structure for rectangular filter elements
Assignee: ABB Technology FLB AB
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Filing: 1986-05-30
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Granted: 1988-10-11
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Expires: 2006-05-30
Abstract
Abstract A device for a suspended ceiling structure (1) for rectangular filter elements (2, 3). Some filter elements are located at a distance from each other to allow the suspension of light fittings from the suspended ceiling structure. An air stream is forced to flow out from the filter elements in the direction downwards towards the floor and vanes (8, 9) are then arranged substantially at the same level as and adjacent to at least one of those lateral surfaces of the fitting, which face the filter elements. The vanes are arranged at an angle to the air stream in such a way that the air is deflected and is made to flow towards a region (10) immediately below the light fitting.
Inventors
- 👤 John E. Lokander
- 👤 Soren Andersson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:29
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/28; F24F13/02; F24F13/06; F24F13/078; F24F8/00; F24F8/10; F24F8/108
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
137 words
A device for a suspended ceiling structure for rectangular filter elements, wherein at least some filter elements are located at a distance from each other to allow therebetween the suspension of objects such as light fittings or the like from the suspended ceiling structure and in addition an air stream is forced to flow out through the filter elements and downwards towards the floor, comprising vanes inclined towards said objects and arranged substantially at the same level as and adjacent to at least one of those lateral surfaces of said objects which face said filter elements, said vanes being arranged at such an angle to said air stream as to deflect the air towards a region immediately below each of said suspended objects, whereby the occurrence of turbulent air streams below said suspended objects is substantially eliminated.
Claim 2
Independent Claim
137 words
A device for a suspended ceiling structure for rectangular filter elements, wherein at least some filter elements are located at a distance from each other to allow therebetween the suspension of objects such as light fittings or the like from the suspended ceiling structure and in addition an air stream is forced to flow out through the filter elements and downwards towards the floor, comprising vanes inclined towards said objects and arranged substantially at the same level as and adjacent to at least one of those lateral surfaces of said objects which face said filter elements, said vanes being arranged at such an angle to said air stream as to deflect the air towards a region immediately below each of said suspended objects, whereby the occurrence of turbulent air streams below said suspended objects is substantially eliminated.
Claim 3
Dependent Claim
29 words
The device according to claim 1, wherein said vanes are arranged in the form of a frame positioned within and essentially parallel to the edges of said filter element.
Claim 4
Dependent Claim
43 words
The device according to claim 1, wherein said vanes are placed at both sides of each said suspended object, whereby the velocity of the air stream immediately below said object is greater than the air velocity below the centre of said filter elements.
Claim 5
Dependent Claim
26 words
The device of claim 1, wherein said objects are light fixtures suspended below said ceiling structure and wherein said vanes are fixed to said light fixtures.
References Cited (Backward Citations)
US3001464A
Cited
US3173616A
Cited
US3166001A
Cited
US3254587A
Cited
US4178159A
Cited
US4616558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |