Class E04F : FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
Subclass 11/032: 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 characterised by the supporting structure Spiral stairways supported by a central column
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 11939190 | Elevating apparatus based on hetero-oriented, non-isometric, dual-spiral drive structure | Aug 06, 21 | Mar 26, 24 | TAIZHOU UNIVERSITY; JIANGSU ZHIJI ENVIORNMENTAL PROTECTION TECHNOLOGY CO., LTD.; |
| 11629500 | Freestanding modular spiral staircase | Dec 31, 20 | Apr 18, 23 | Not available |
| 11585108 | Lifeguard observation station | Jun 18, 20 | Feb 21, 23 | Aqua Conscience Holdings LLC |
| 11560731 | Vertical flood escape structure | Apr 27, 22 | Jan 24, 23 | The Government of the United States of America, as represented by the Secretary of Homeland Security |
| 11466461 | Actuatable assemblies | Apr 27, 19 | Oct 11, 22 | Null Networks LLC |
| 10487514 | Tread mounting system for spiral staircase | Jul 10, 19 | Nov 26, 19 | Safe Rack LLC |
| 10407914 | Spacer for prefabricated spiral staircase and prefabricated spiral staircase using same | Jan 10, 17 | Sep 10, 19 | Not available |
| 10378212 | Tread mounting system for spiral staircase | May 23, 18 | Aug 13, 19 | Safe Rack LLC |
| 10214912 | Kit of parts for modular staircase | Sep 10, 15 | Feb 26, 19 | Lograr Group Limited |
| 10100526 | Modular shelving and step assembly | May 13, 16 | Oct 16, 18 | Not available |
| 9803368 | Methods and systems of preparing and installing custom-made spiral staircases | Apr 15, 16 | Oct 31, 17 | Not available |
| 9534395 | Staircase element and method for building a staircase | Nov 20, 15 | Jan 03, 17 | RAKENNUS JA TEKNIIKKA HAASLAHTI OY |
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2023/0033,898 | Guard Assemblies | Oct 10, 22 | Feb 02, 23 | Not available |
| 2021/0238,860 | INVISIBLE STAIRCASE | Apr 22, 21 | Aug 05, 21 | Not available |
| 2021/0131,111 | FREESTANDING MODULAR SPIRAL STAIRCASE | Dec 31, 20 | May 06, 21 | Not available |
| 2021/0131,110 | Freestanding Modular Spiral Staircase | Oct 23, 20 | May 06, 21 | Not available |
| 2020/0032,520 | STAIRCASE PRODUCED BY 3D PRINTING OF A CEMENTITIOUS MATERIAL | Jul 30, 19 | Jan 30, 20 | VCF HABITAT IDF |
| 2019/0360,212 | TREAD MOUNTING SYSTEM FOR SPIRAL STAIRCASE | Jul 10, 19 | Nov 28, 19 | Not available |
| 2017/0342,719 | PREFABRICATED SPIRAL STAIRCASE | Jan 05, 16 | Nov 30, 17 | Not available |
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