US4744409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve assembly for air treatment apparatus
Assignee: Individual
•
Filing: 1987-02-24
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Granted: 1988-05-17
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Expires: 2007-02-24
Abstract
Abstract A valve assembly for use with air treatment apparatus is disclosed. The assembly includes shutter valves disposed in the air flow channels and actuatable by the flow of air therethrough.
Inventors
- 👤 Erling Berner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:39
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/1426; F24F12/00; F24F12/001; F24F13/1413; F24F2012/008; Y; Y02; Y02B; Y02B30/00; Y02B30/56; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/037; Y10S165/909; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/7779; Y10T137/7837; Y10T137/7838; Y10T137/7898; Y10T137/7903
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
143 words
In an air treatment apparatus having a heat exchanging matrix disposed within a chamber for alternately giving heat up to and receiving heat from a reversing flow of air across said matrix, the improvement comprising: ducting disposed between said matrix and a source of intake air, said ducting defining two separate flow channels to said source, a first one of said channels being an intake channel and a second one of said channels being an exhaust channel; valve means disposed in each of said flow channels at the ends thereof proximate to said chamber and being biased to the closed position, the valve means in said intake channel being actuatable to the open position by air flow in said intake channel and the valve means in the exhaust channel being actuatable to the open position by air flow out of the exhaust channel.
Claim 2
Dependent Claim
143 words
In an air treatment apparatus having a heat exchanging matrix disposed within a chamber for alternately giving heat up to and receiving heat from a reversing flow of air across said matrix, the improvement comprising: ducting disposed between said matrix and a source of intake air, said ducting defining two separate flow channels to said source, a first one of said channels being an intake channel and a second one of said channels being an exhaust channel; valve means disposed in each of said flow channels at the ends thereof proximate to said chamber and being biased to the closed position, the valve means in said intake channel being actuatable to the open position by air flow in said intake channel and the valve means in the exhaust channel being actuatable to the open position by air flow out of the exhaust channel.
Claim 3
Dependent Claim
40 words
The improvement recited in claim 1 which further comprises: a pair of ports disposed at the ends of said channels distal of the chamber, said ports being divergent from one another to substantially reduce co-mingling of intake and exhaust air.
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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) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |