E04F 11/025
Stairways having stringers
Official title: Stairways having stringers {(E04F11/035 takes precedence)}
E04F11/025 (Stairways having stringers) appears on 186 US grants and 120 published applications in this corpus.
Search patents in E04F- Granted patents
- 186
- Published applications
- 120
- Assignees
- 92
- Inventors
- 279
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 4 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 5 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 6 | 0 |
| 1990 | 5 | 0 |
| 1991 | 4 | 0 |
| 1992 | 4 | 0 |
| 1993 | 4 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 4 | 1 |
| 2002 | 4 | 6 |
| 2003 | 4 | 6 |
| 2004 | 8 | 4 |
| 2005 | 6 | 7 |
| 2006 | 3 | 1 |
| 2007 | 1 | 4 |
| 2008 | 0 | 3 |
| 2009 | 3 | 8 |
| 2010 | 1 | 5 |
| 2011 | 8 | 4 |
| 2012 | 2 | 4 |
| 2013 | 2 | 6 |
| 2014 | 8 | 5 |
| 2015 | 9 | 6 |
| 2016 | 3 | 6 |
| 2017 | 6 | 4 |
| 2018 | 1 | 0 |
| 2019 | 4 | 6 |
| 2020 | 4 | 7 |
| 2021 | 4 | 5 |
| 2022 | 4 | 4 |
| 2023 | 6 | 4 |
| 2024 | 3 | 4 |
| 2025 | 6 | 7 |
| 2026 | 4 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Adjustable stair railing post assembly22 Sep 2026US 12,742,327 B2PrimeSource Building Products, Inc.
- Modular staircase1 Sep 2026US 12,723,410 B2NxGen Homes Pty Ltd
- Reinforced adjustable stair tray27 Jan 2026US 12,534,919 B2Fortress Iron, LP
- Platform system27 Jan 2026US 12,534,923 B2Safe Rack LLC
- Concealed hanger4 Nov 2025US 12,460,406 B2Simpson Strong-Tie Company, Inc.
- Stringer connector and staircase11 Jun 2026US 2026/0160070 A1Peak Innovations Inc.
- Platform system11 Jun 2026US 2026/0160071 A1Safe Rack LLC
- Platform system28 May 2026US 2026/0146458 A1Safe Rack LLC
- A construction site staircase assembly and installation method therefor3 Jul 2025US 2025/0215711 A1
- Reinforced adjustable stair tray26 Jun 2025US 2025/0207405 A1Fortress Iron, LP
Most cited
By later US patents
- Portable stairs with adjustable landing platform height82US 6,810,995 B22004
- Newel post assembly77US 4,367,864 A1983
- Fiber reinforced plastic (FRP) composite structural system for decks, docks, boardwalks, walkways, spa decks, hot tub decks and gazebos and components therefore and method of making same76US 6,427,403 B12002
- Modular portable stage system72US 6,106,186 AWenger Corporation · 2000
- Glass support member48US 7,165,362 B2Apple Computer, Inc. · 2007