US5891399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning arrangement including filters and ultraviolet radiation
Assignee: Klean AS
•
Filing: 1994-12-01
•
Granted: 1999-04-06
•
Expires: 2014-12-01
Abstract
Abstract A device used in an air purifying system. The device includes an ultraviolet radiation source, a pre-filter, and a post-filter. The pre-filter is arranged adjacent to the ultraviolet light source such that the pre-filter is irradiated by the ultraviolet light source to destroy bacteria, virus, or other organisms on the pre-filter. The device also includes a cover that is movable between an open and closed position. In the closed position, the device operates in a passive mode to irradiate air within the device and to filter air through filters in the device. In the open position, the device operates in an active mode to irradiate an area external of the device and to simultaneously filter air through a filter in the device.
Inventors
- 👤 Yngvar S. Owesen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:00
CPC Classifications
A; A61; A61L; A61L9/00; A61L9/16; A61L9/18; A61L9/20; F; F24; F24F; F24F8/00; F24F8/20; F24F8/22; F24F8/10; F24F8/15; F24F8/158; F24F8/192; F24F8/194; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
295 words
A device used in an air purifying system, the device comprising: a housing through which air flows, the housing having an inlet and an outlet; an ultraviolet light source positioned in said housing; a particulate pre-filter positioned in said housing and located upstream of said ultraviolet light source with respect to a direction of air flow; a post-filter positioned in said housing and located downstream of said ultraviolet light source with respect to the direction of air flow, said particulate pre-filter being located adjacent to said ultraviolet light source such that said particulate pre-filter is irradiated by said ultraviolet light source when said ultraviolet light source is activated, said particulate pre-filter also preventing ultraviolet light from said ultraviolet light source from passing through said particulate pre-filter to said inlet; a fan located downstream of said ultraviolet light source with respect to the direction of airflow and located upstream of said post-filter with respect to the direction of airflow: a cover moveable between an open position in which ultraviolet light from said ultraviolet light source is permitted to irradiate an area external of said housing and a closed position in which said ultraviolet light from said ultraviolet light source is prevented from irradiating said area external of said housing; and remotely controlled means which upon appropriate signal moves said cover between said closed position defining a passive mode in which air within the housing is irradiated by ultraviolet light from said ultraviolet light source and air is filtered through said particulate pre-filter and said post-filter, and said open position defining an active mode in which said area external of said housing is irradiated by ultraviolet light from said ultraviolet light source and air is filtered through at least one of said particulate pre-filter and said post-filter.
Claim 2
Independent Claim
295 words
A device used in an air purifying system, the device comprising: a housing through which air flows, the housing having an inlet and an outlet; an ultraviolet light source positioned in said housing; a particulate pre-filter positioned in said housing and located upstream of said ultraviolet light source with respect to a direction of air flow; a post-filter positioned in said housing and located downstream of said ultraviolet light source with respect to the direction of air flow, said particulate pre-filter being located adjacent to said ultraviolet light source such that said particulate pre-filter is irradiated by said ultraviolet light source when said ultraviolet light source is activated, said particulate pre-filter also preventing ultraviolet light from said ultraviolet light source from passing through said particulate pre-filter to said inlet; a fan located downstream of said ultraviolet light source with respect to the direction of airflow and located upstream of said post-filter with respect to the direction of airflow: a cover moveable between an open position in which ultraviolet light from said ultraviolet light source is permitted to irradiate an area external of said housing and a closed position in which said ultraviolet light from said ultraviolet light source is prevented from irradiating said area external of said housing; and remotely controlled means which upon appropriate signal moves said cover between said closed position defining a passive mode in which air within the housing is irradiated by ultraviolet light from said ultraviolet light source and air is filtered through said particulate pre-filter and said post-filter, and said open position defining an active mode in which said area external of said housing is irradiated by ultraviolet light from said ultraviolet light source and air is filtered through at least one of said particulate pre-filter and said post-filter.
Claim 3
Dependent Claim
28 words
The device as claimed in claim 1, further comprising a detection device for detecting the presence of a human or an animal and signaling said remotely controlled means.
Claim 4
Dependent Claim
15 words
The device as claimed in claim 2, wherein said detection device includes an IR detector.
Claim 5
Dependent Claim
16 words
The device as claimed in claim 2, wherein said detection device is attached to said housing.
Claim 6
Dependent Claim
20 words
The device as claimed in claim 2, wherein said detection device is located at a location remote from said housing.
Claim 7
Dependent Claim
15 words
The device as claimed in claim 1, wherein said particulate pre-filter is an EU4 filter.
Claim 8
Dependent Claim
24 words
The device as claimed in claim 1, wherein said ultraviolet light source includes an ultraviolet tube located along a longitudinal axis of said housing.
Claim 9
Dependent Claim
34 words
The device as claimed in claim 1, wherein said post-filter includes a bioclimatic filter positioned in said housing and located downstream of said ultraviolet light source with respect to the direction of air flow.
Claim 10
Dependent Claim
29 words
The device as claimed in claim 1, wherein said post-filter includes a carbon filter located downstream of said ultraviolet light source with respect to the direction of air flow.
Claim 11
Dependent Claim
24 words
The device as claimed in claim 1, further comprising a sensor device for sensing movement and deactivating said ultraviolet light source upon sensing movement.
Claim 12
Dependent Claim
21 words
The device as claimed in claim 1, further comprising controlling means for controlling a radiation strength of said ultraviolet light source.
Claim 13
Dependent Claim
21 words
The device as claimed in claim 1, further comprising regulating means for regulating an amount of air flow through said housing.
Claim 14
Dependent Claim
35 words
The device as claimed in claim 1, in combination with a ventilation system, said system having a plurality of air duct branches for providing air to said inlet or for discharging air from said outlet.
References Cited (Backward Citations)
US2906104A
Cited
US2945554A
Cited
US3418069A
Cited
US3674421A
Cited
US3576593A
Cited
CH533810A
Cited
GB1400519A
Cited
GB1421495A
Cited
GB1540752A
Cited
DE2539743A1
Cited
US4049400A
Cited
US4118191A
Cited
DE2733729A1
Cited
US4210429A
Cited
DE2817772A1
Cited
DE2844997A1
Cited
US4400270A
Cited
US4673848A
Cited
US4766321A
Cited
DE3637702A1
Cited
US4909040A
Cited
US5019804A
Cited
US4990313A
Cited
EP0461310A1
Cited
US5114670A
Cited
US5330722A
Cited
US5185015A
Cited
US5225167A
Cited
US5369892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-04-05 | 2002-10-05 | 2003-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-04-05 | 2006-10-05 | 2007-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-04-05 | 2010-10-05 | 2011-04-06 | $7700.00 | Window Closed / Lapsed |