Window fan with controller
Patent 5000381 Issued on March 19, 1991. Estimated Expiration Date: 
February 22, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 22, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2177596 2257462 2383533 2553172 2750868 Air mixing valve having a thermal motor actuator for effecting adjustment Apparatus and methods for controlling fan operation Solar energy control system and method Patent #: 4422444 InventorsAssigneeApplicationNo. 485857 filed on 02/22/1990US Classes:236/44C, Humidity and temperature control165/291, Temperature sensor inside conditioned space, another temperature sensor outdoor (e.g., indoor set point adjusted by outdoor conditions, etc.)236/49.3, Electrically actuated454/208Propeller fan having rotary axis perpendicular to windowExaminersPrimary: Wayner, William E.Attorney, Agent or FirmInternational ClassB01F 003/02AbstractA window fan with an electronic controller having an AUTO mode of operation that is responsive to the ƊT between inside and outside temperature, a minimum inside temperature threshold, and the outside relative humidity. Accordingly, if it is relatively hot or humid outside, or if it is relatively cold inside, the window fan is inactive. Thus, the fan is automatically activated only during those time periods when it is most advantageous to ventilate with outside fresh air.Other References
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