E04F 11/0255
Having adjustable gradient
Official title: {having adjustable gradient (E04F11/1041 takes precedence)}
E04F11/0255 (Having adjustable gradient) appears on 55 US grants and 37 published applications in this corpus.
Search patents in E04F- Granted patents
- 55
- Published applications
- 37
- Assignees
- 25
- Inventors
- 79
- Latest grant
- 27 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 4 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 1 |
| 2003 | 2 | 5 |
| 2004 | 3 | 1 |
| 2005 | 4 | 4 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 1 | 4 |
| 2010 | 0 | 1 |
| 2011 | 4 | 2 |
| 2012 | 1 | 0 |
| 2013 | 0 | 1 |
| 2014 | 2 | 1 |
| 2015 | 2 | 2 |
| 2016 | 2 | 1 |
| 2017 | 2 | 1 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 3 |
| 2021 | 3 | 2 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 3 | 1 |
| 2025 | 1 | 4 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Reinforced adjustable stair tray27 Jan 2026US 12,534,919 B2Fortress Iron, LP
- Staircase with adjustable height risers25 Mar 2025US 12,258,764 B2
- Splicing step device28 May 2024US 11,993,936 B1
- Modular staircase systems30 Apr 2024US 11,970,865 B2CB Interests Inc.
- Stair assembly with rise adjustable step support brackets30 Jan 2024US 11,885,134 B2Fortress Iron, LP
- Reinforced adjustable stair tray26 Jun 2025US 2025/0207405 A1Fortress Iron, LP
- Adjustable stair railing post assembly8 May 2025US 2025/0146292 A1Fortress Iron, LP
- Elongated ramp in lifting system for a stairway1 May 2025US 2025/0136412 A1Liftup A/S
- Modular Stairs20 Feb 2025US 2025/0059770 A1
- Staircase with adjustable height risers29 Aug 2024US 2024/0287811 A1
Most cited
By later US patents
- Modular portable stage system72US 6,106,186 AWenger Corporation · 2000
- Adjustable stairstep system and process of assembling and installing same46US 5,636,483 AQuick-Flight Stair Co., Inc. · 1997
- Modular portable system45US 5,848,501 AWenger Corporation · 1998
- Adjustable stairway39US 4,959,935 A1990
- Adjustable modular staircase31US 6,397,529 B12002