Device for opening out and folding back one or more thermal screens inside a hothouse
Patent 4577436 Issued on March 25, 1986. Estimated Expiration Date: 
March 25, 2003. 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.
March 25, 2003. 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 3401607 Small building structure Method and apparatus for retaining heat in greenhouse and similar structures Patent #: 4387533 InventorApplicationNo. 06/449676 filed on 12/14/1982US Classes:47/17GREENHOUSE, APPARATUS OR METHODExaminersPrimary: Hafer, Robert A.Assistant: DeMille, Danton D. International ClassA01G 9/22 (20060101)Foreign Application Priority Data1981-12-18 FRAbstractThe present invention relates to a device for opening out and folding back one or more thermal screens by a plurality of extensible chambers moving over and around guiding hoops, which chambers comprise a piston forming the movable ends of the chambers, which device comprises, close to and under the piston of each retracted air chamber, a deformable membrane borne by a structure and placed in contact with the periphery of the chamber and whose function is to slow down the extension of the chamber when the latter is pressurized, in order to ensure a good air distribution in the inflated part of said chamber and so prevent that part from winding itself around the guiding hoop when the screen is opened out.Field of SearchGREENHOUSE, APPARATUS OR METHOD | |
