US4324358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Minimum airflow control
Assignee: Carrier Corp
•
Filing: 1980-07-02
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Granted: 1982-04-13
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Expires: 2000-07-02
Abstract
Abstract In a central air conditioning system where airflow is regulated by bellows inflation which is controlled by a bleed-type thermostat, a second bleed which is controlled by a regulator is provided to insure a minimum flow for ventilation independent of cooling demand.
Inventors
- 👤 David Tulowiecki
- 👤 Richard R. Lavassaur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:33
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/185; F; F24; F24F; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F11/76
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
167 words
A minimum airflow control for an air distribution unit comprising: bellows controlled damper means for controlling the flow of conditioned air into an area; first regulator means opening at a first pressure to supply control air to said bellows to cause said bellows to inflate in accordance with the pressure of said control air; thermostatic means for controlling the pressure of said control air supplied to said bellows by said first regulator means over a first pressure range by bleeding said control air to atmosphere in response to the setting of said thermostatic means to thereby control the inflation of said bellows; and second regulator means opening at a second pressure which is higher than said first pressure for controlling the pressure of said control air supplied to said bellows by said first regulator means over a second pressure range by bleeding said control air to atmosphere whereby said bellows are inflated so as to provide a minimum flow of conditioned air independent of said thermostatic means.
Claim 2
Dependent Claim
167 words
A minimum airflow control for an air distribution unit comprising: bellows controlled damper means for controlling the flow of conditioned air into an area; first regulator means opening at a first pressure to supply control air to said bellows to cause said bellows to inflate in accordance with the pressure of said control air; thermostatic means for controlling the pressure of said control air supplied to said bellows by said first regulator means over a first pressure range by bleeding said control air to atmosphere in response to the setting of said thermostatic means to thereby control the inflation of said bellows; and second regulator means opening at a second pressure which is higher than said first pressure for controlling the pressure of said control air supplied to said bellows by said first regulator means over a second pressure range by bleeding said control air to atmosphere whereby said bellows are inflated so as to provide a minimum flow of conditioned air independent of said thermostatic means.
Claim 3
Dependent Claim
27 words
The minimum airflow control of claim 1 wherein said second regulator means is fluidly connected to said first regulator means so as to bypass said thermostatic means.
References Cited (Backward Citations)
US3434409A
Cited
US3554112A
Cited
US3595475A
Cited
US3653588A
Cited
US3727835A
Cited
US3806027A
Cited
US3961748A
Cited
US3937398A
Cited
US4019566A
Cited
US4077567A
Cited
US4120453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |