Class E04F : FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
Subclass 11/028: 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 Stairways having stringers having a central stringer
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 12252886 | Floating modular stair system | Oct 04, 21 | Mar 18, 25 | PrimeSource Building Products, Inc. |
| 10358827 | System and method for stair assembly and installation | Jul 12, 18 | Jul 23, 19 | Not available |
| 10006207 | Open stair case with center uncut stringer | Sep 18, 15 | Jun 26, 18 | Not available |
| 9212491 | Modular stairway | May 22, 15 | Dec 15, 15 | Not available |
| 9085904 | Spiral box stair | May 22, 14 | Jul 21, 15 | Not available |
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