Patent US2752496A successfully refreshed from Google Patents.
US3949607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enthalpy control apparatus for air conditioning
Assignee: Honeywell Inc
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Filing: 1974-10-03
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Granted: 1976-04-13
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Expires: 1994-10-03
Abstract
Abstract A control apparatus responding to enthalpy or "total" heat content, temperature and moisture content, of air wherein a moisture responsive element changes in length and is reset by a temperature responsive element to control a switch with means to limit the effect of the moisture responsive element above certain levels of moisture so the switch is controlled only by temperature.
Inventors
- 👤 Keith M. Nodolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:48
CPC Classifications
G; G05; G05D; G05D27/00; G05D27/02; G01; G01W; G01W1/00; G01W1/17
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
An improvement in control apparatus having humidity responsive means responsive to the humidity of air for controlling an output means and temperature responsive means responsive to the temperature of air connected to override the humidity responsive means to change the output means to provide an output indicative of a thermodynamic property of the air, the improvement comprising means connected to said humidity responsive means for rendering said humidity responsive means inoperative at high humidity levels so that at high humidity levels said output means provides an output indicative of only temperature.
Claim 2
Dependent Claim
91 words
An improvement in control apparatus having humidity responsive means responsive to the humidity of air for controlling an output means and temperature responsive means responsive to the temperature of air connected to override the humidity responsive means to change the output means to provide an output indicative of a thermodynamic property of the air, the improvement comprising means connected to said humidity responsive means for rendering said humidity responsive means inoperative at high humidity levels so that at high humidity levels said output means provides an output indicative of only temperature.
Claim 3
Dependent Claim
122 words
In control apparatus responsive to moisture and temperature conditions of air for providing an output indicative of a thermodynamic property of the air comprising, a base, output means connected to said base, adjustment means connected to said base, moisture responsive means responsive to the moisture of air and connected between said output means and said adjustment means, temperature responsive means responsive to the temperature of air and connected to said adjustment means for changing the effects of said moisture responsive means on said output means in response to temperature, and limiting means for limiting the effect of said moisture responsive means on said output means so that at high moisture levels said output is responsive to only the temperature of the air.
Claim 4
Dependent Claim
122 words
In control apparatus responsive to moisture and temperature conditions of air for providing an output indicative of a thermodynamic property of the air comprising, a base, output means connected to said base, adjustment means connected to said base, moisture responsive means responsive to the moisture of air and connected between said output means and said adjustment means, temperature responsive means responsive to the temperature of air and connected to said adjustment means for changing the effects of said moisture responsive means on said output means in response to temperature, and limiting means for limiting the effect of said moisture responsive means on said output means so that at high moisture levels said output is responsive to only the temperature of the air.
Claim 5
Dependent Claim
79 words
The invention of claim 2 wherein said moisture responsive means comprises a flexible element which changes in length as the moisture of the surrounding air changes said limiting means comprises a wire loosely attached to said adjustment means and said output means to limit the length of said element whereby at high moisture levels when said element exceeds a predetermined length, said moisture responsive means has no effect and said output means is controlled by said temperature responsive means.
Claim 6
Dependent Claim
31 words
The invention of claim 3 wherein said adjustment means has a manual input for setting the control point of said apparatus to select a particular enthalpy for controlling said output means.
Claim 7
Dependent Claim
109 words
In an enthalpy control apparatus comprising, a base member, output means connected to said base member, adjustment means connected to said base member, moisture responsive means connected between said output means and said adjustment means, said moisture responsive means changes in length as the moisture in the surrounding air increases to operate said output means, temperature responsive means connected to said adjustment means for resetting the effect of said moisture responsive means on said output means, and limiting means for limiting the effect of said moisture responsive means whereby upon said moisture responsive means reaching a high moisture level said temperature responsive means has control of said output means.
Claim 8
Dependent Claim
109 words
In an enthalpy control apparatus comprising, a base member, output means connected to said base member, adjustment means connected to said base member, moisture responsive means connected between said output means and said adjustment means, said moisture responsive means changes in length as the moisture in the surrounding air increases to operate said output means, temperature responsive means connected to said adjustment means for resetting the effect of said moisture responsive means on said output means, and limiting means for limiting the effect of said moisture responsive means whereby upon said moisture responsive means reaching a high moisture level said temperature responsive means has control of said output means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |