Class E04F : FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
Subclass 11/04: Stairways, ramps, or like structures (mounting or marking-off stairways E04F 21/26; of temporary construction E04G 27/00); Balustrades; Handrails (ladders permanently attached to fixed structures E06C 9/00) Stairways; Layouts thereof Movable stairways, e.g. of loft ladders which may or may not be concealable or extensible (ship ladders B63B; stairs for aircraft B64F; escalators or moving walkways B66B)
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 12227950 | Attic stair apparatus | Oct 18, 23 | Feb 18, 25 | Not available |
| 12017889 | Convertible stairs for wheelchair accessibility | Jun 08, 23 | Jun 25, 24 | Kuwait University |
| 11629500 | Freestanding modular spiral staircase | Dec 31, 20 | Apr 18, 23 | Not available |
| 11485613 | Lifting aid for attic ladder system | Mar 06, 20 | Nov 01, 22 | Not available |
| 10988938 | Self-leveling platform stairs | Jan 08, 20 | Apr 27, 21 | Safesmart LLC |
| 10738474 | Stackable step component with adjustable tread incline | Nov 09, 19 | Aug 11, 20 | Not available |
| 10662718 | Drilling rig stair tower with integrated utility lines and cable tray | Jun 15, 17 | May 26, 20 | Nabors Drilling Technologies USA, Inc. |
| 10612244 | Landscaping structure | Apr 12, 19 | Apr 07, 20 | Not available |
| 10364575 | Elevation-type stair structure | Apr 25, 18 | Jul 30, 19 | Not available |
| 10202772 | Self-actuating flood guard | Oct 29, 16 | Feb 12, 19 | Floodbreak, L.L.C. |
| 10100576 | Undergrate stairway access assembly | Sep 06, 16 | Oct 16, 18 | Not available |
| 9957720 | Retractable staircase and method | Nov 25, 16 | May 01, 18 | MAJIC STAIRS INC. |
| 9683408 | Pivoting stairs | Jun 16, 15 | Jun 20, 17 | Not available |
| 9644375 | Portable pathway apparatus | Feb 22, 15 | May 09, 17 | Not available |
| 9644376 | Tank farm system | Feb 23, 15 | May 09, 17 | Not available |
| 9499991 | Stair modules which co operate to form a temporary stair case | Feb 11, 14 | Nov 22, 16 | Not available |
| 9091083 | Adjustable staircase | Mar 10, 14 | Jul 28, 15 | OTTAWA HOSPITAL RESEARCH INSTITUTE |
| 8985276 | Portable pathway apparatus | Aug 15, 13 | Mar 24, 15 | Not available |
| 8960368 | Tank farm system | Aug 01, 13 | Feb 24, 15 | Not available |
| 8931215 | Attic stairway insulator assembly | Jun 04, 14 | Jan 13, 15 | OWENS CORNING INTELLECTUAL CAPITAL, LLC |
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2025/0084,643 | ATTIC STAIR APPARATUS | Nov 22, 24 | Mar 13, 25 | Not available |
| 2023/0399,851 | SPIRAL STAIRCASE | Jun 08, 22 | Dec 14, 23 | Not available |
| 2023/0323,706 | BOX CONSTRUCTION LOCK | Feb 27, 23 | Oct 12, 23 | Fakro PP Sp. z o. o. |
| 2023/0304,293 | Bracket | Feb 27, 23 | Sep 28, 23 | Fakro PP Sp. z o. o. |
| 2020/0190,813 | VEHICLE SERVICE PIT | Dec 12, 19 | Jun 18, 20 | Not available |
| 2017/0362,901 | DRILLING RIG STAIR TOWER WITH INTEGRATED UTILITY LINES AND CABLE TRAY | Jun 15, 17 | Dec 21, 17 | Not available |
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