Strand chair for supporting prestressing cable and cross-mesh in elongated precast concrete plank
Patent 4644727 Issued on February 24, 1987. Estimated Expiration Date: 
February 4, 2006. 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 4, 2006. 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 1903356 3114221 3694988 3694989 3783574 3830032 InventorsAssigneeApplicationNo. 06/825852 filed on 02/04/1986US Classes:52/687, Plural feet or seat52/678, Adjustable support52/689Single seatExaminersPrimary: Raduazo, Henry E.Attorney, Agent or FirmInternational ClassesE04C 5/08 (20060101)E04C 5/20 (20060101) E04C 5/16 (20060101) E04C 5/00 (20060101) AbstractThe chairs include a lower chair portion for supporting multiple prestressing cables at the bottom of a plank and a narrow upper chair portion for supporting an upper prestressing cable located in the web between the hollow cores of the prestressed plank. The upper chair portion can be inserted into the strand receiving cups of the lower portion to form a structurally sound support for accurately placing the top and bottom reinforcing strands in the plank as it is cast.Other References
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