Patent US4502290A successfully refreshed from Google Patents.
US4502290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioner
Assignee: Hitachi Ltd
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Filing: 1983-12-05
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Granted: 1985-03-05
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Expires: 2003-12-05
Abstract
Abstract An air conditioner including a room temperature detector, a room temperature adjuster and a controller is disclosed which is provided with a photodetector, and in which the temperature set in the room temperature adjuster is changed on the basis of the illuminance detected by the photodetector, and a signal for controlling a compressor is generated by the controller in accordance with the temperature thus changed.
Inventors
- 👤 Akio Suzuki
- 👤 Mitsuo Akiyama
- 👤 Susumu Kashiwazaki
- 👤 Shigeyasu Suzuki
- 👤 Yasunori Tominaga
- 👤 Michihisa Arakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:02
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/50; F24F11/52; F24F11/61; F24F11/62; F24F11/63; F24F11/70; F24F11/80; F24F11/86; F24F11/88; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1902; G05D23/20; G05D23/24; F24F11/30; F24F11/56; F24F2110/00; F24F2110/10; F24F2130/00; F24F2130/20; F24F2130/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
171 words
An air conditioner having a room temperature detector, a room temperature adjuster and a controller to cause said controller to control a compressor on the basis of an output from said room temperature detector so that a room temperature detected by said room temperature detector becomes equal to a predetermined temperature set in said room temperature adjuster, said air conditioner comprising a photodetector for generating a signal indicative of the illuminance at said photodetector to change said temperature set in said room temperature adjuster, by said controller, on the basis of said signal, first means for detecting a first illuminance having a predetermined value from the illuminance at said photodetector and second means for detecting a second illuminance having another predetermined value from the illuminance at said photodetector, and the output of said first means and the output of said second means are applied to said controller to change said temperature set in said room temperature adjuster, by said controller, in accordance with said outputs of said first and second means.
Claim 2
Dependent Claim
171 words
An air conditioner having a room temperature detector, a room temperature adjuster and a controller to cause said controller to control a compressor on the basis of an output from said room temperature detector so that a room temperature detected by said room temperature detector becomes equal to a predetermined temperature set in said room temperature adjuster, said air conditioner comprising a photodetector for generating a signal indicative of the illuminance at said photodetector to change said temperature set in said room temperature adjuster, by said controller, on the basis of said signal, first means for detecting a first illuminance having a predetermined value from the illuminance at said photodetector and second means for detecting a second illuminance having another predetermined value from the illuminance at said photodetector, and the output of said first means and the output of said second means are applied to said controller to change said temperature set in said room temperature adjuster, by said controller, in accordance with said outputs of said first and second means.
Claim 3
Dependent Claim
22 words
An air conditioner according to claim 1, wherein the resistance of said photodetector is decreased when said photodetector is irradiated with light.
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) | 1988-03-04 | 1988-09-03 | 1989-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-04 | 1992-09-03 | 1993-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-04 | 1996-09-03 | 1997-03-05 | $7700.00 | Window Closed / Lapsed |