E04F 11/04

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9957720 Retractable staircase and methodNov 25, 16May 01, 18MAJIC STAIRS INC.
9683408 Pivoting stairsJun 16, 15Jun 20, 17Not available
9644375 Portable pathway apparatusFeb 22, 15May 09, 17Not available
9644376 Tank farm systemFeb 23, 15May 09, 17Not available
9499991 Stair modules which co operate to form a temporary stair caseFeb 11, 14Nov 22, 16Not available
9091083 Adjustable staircaseMar 10, 14Jul 28, 15OTTAWA HOSPITAL RESEARCH INSTITUTE
8985276 Portable pathway apparatusAug 15, 13Mar 24, 15Not available
8960368 Tank farm systemAug 01, 13Feb 24, 15Not available
8931215 Attic stairway insulator assemblyJun 04, 14Jan 13, 15OWENS CORNING INTELLECTUAL CAPITAL, LLC
8272477 Fire resistant foldable stowed stair assemblyNov 02, 07Sep 25, 12Not available
5950267 Portable gangway with leveling stairsOct 06, 97Sep 14, 99Not available
5628151 Multipocket means for holding insulation to prevent heat loss through an attic stairwellNov 15, 94May 13, 97Not available
5623795 Draft insulator for an attic pull-down staircaseJun 05, 96Apr 29, 97Not available
4832153 Attic stair insulating coverMay 31, 88May 23, 89Not available
4642953 Moveable stair apparatusFeb 10, 86Feb 17, 87Not available
4541508 Foldable or retractable ladder for mounting in a ceilingJun 22, 83Sep 17, 85Not available