E04F 11/032

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9803368 Methods and systems of preparing and installing custom-made spiral staircasesApr 15, 16Oct 31, 17Not available
9534395 Staircase element and method for building a staircaseNov 20, 15Jan 03, 17RAKENNUS JA TEKNIIKKA HAASLAHTI OY
6155007 Surface tread for a spiral staircaseJan 28, 98Dec 05, 00Not available
6044599 Spiral staircaseAug 04, 97Apr 04, 00Not available
5881509 Spiral staircase and connecting metals for spiral staircaseJul 15, 97Mar 16, 99Inafuku Construction Co., Ltd.
5515657 Winding stairAug 15, 95May 14, 96Not available