Precast concrete stairway module
Patent 4248020 Issued on February 3, 1981. Estimated Expiration Date: 
June 7, 1999. 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.
June 7, 1999. 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 3755974 3788018 3830026 InventorsAssigneeApplicationNo. 06/046470 filed on 06/07/1979US Classes:52/185, Multilevel building52/189, Precast stonelike component52/79.1PREASSEMBLED SUBENCLOSURE OR SUBSTRUCTURE SECTION(S) OF UNIT OR BUILDINGExaminersPrimary: Bell, J. KarlAttorney, Agent or FirmInternational ClassesE04B 1/34 (20060101)E04B 1/348 (20060101) E04F 11/02 (20060101) Foreign Application Priority Data1978-07-31 CAAbstractA precast concrete stairway module comprising a concrete wall assembly which is C-shaped in plan view, providing a side wall and two end walls, a concrete stair flight extending from an edge of one side wall to a mid-height position of the other side wall. The stair flight assembly is moulded integrally with the wall assembly and comprises a landing at each end and a flight of stairs therebetween. An access opening is provided in the wall assembly. | |
