Underground transformer cabin consisting of two units, one inside the other
Patent 5220484 Issued on June 15, 1993. Estimated Expiration Date: 
February 7, 2012. 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 7, 2012. 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 3749981 Low headroom ventilating apparatus for cooling an electrical enclosure Insertable housing Patent #: 4901200 InventorApplicationNo. 832240 filed on 02/07/1992US Classes:361/690, Air165/80.3, Air cooled, including fins174/15.1, With cooling or fluid feeding, circulating or distributing361/836For transformerExaminersPrimary: Picard, Leo P.Assistant: Whang, Young Attorney, Agent or FirmForeign Patent References
International ClassH05K 007/20Foreign Application Priority Data1991-12-02 ITAbstractAn underground transformer cabin consisting of two prefabricated vibrated reinforced concrete units, one inside the other. A larger external unit is enclosed by a covering plate, and a smaller, internal unit is raised off a bottom of the larger external unit so that there is a wide air space between the sides and bottom of the two walls. The bottom of said smaller internal unit has windows or openings through which fresh outdoor air flows into the smaller internal unit from underneath, passing first over the transformer and then into an outlet pipe which extend externally at a height above the inlet pipe. | |
