E04F 11/112
Of metal or with an upper layer of metal
Official title: of metal {or with an upper layer of metal}
E04F11/112 (Of metal or with an upper layer of metal) appears on 63 US grants and 66 published applications in this corpus.
Search patents in E04F- Granted patents
- 63
- Published applications
- 66
- Assignees
- 29
- Inventors
- 103
- Latest grant
- 27 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 4 |
| 2003 | 1 | 0 |
| 2004 | 2 | 3 |
| 2005 | 0 | 2 |
| 2006 | 0 | 1 |
| 2007 | 2 | 0 |
| 2008 | 1 | 2 |
| 2009 | 1 | 3 |
| 2010 | 0 | 6 |
| 2011 | 1 | 2 |
| 2012 | 2 | 3 |
| 2013 | 4 | 5 |
| 2014 | 4 | 2 |
| 2015 | 3 | 6 |
| 2016 | 2 | 4 |
| 2017 | 6 | 3 |
| 2018 | 1 | 0 |
| 2019 | 3 | 5 |
| 2020 | 3 | 3 |
| 2021 | 0 | 2 |
| 2022 | 2 | 2 |
| 2023 | 3 | 2 |
| 2024 | 0 | 1 |
| 2025 | 4 | 2 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Platform system27 Jan 2026US 12,534,923 B2Safe Rack LLC
- Metal and steel substructure framing systems4 Nov 2025US 12,460,416 B1New Castle Steel Inc.
- Method for producing a structural element, and a staircase and a structural element and a staircase which have been produced according to this method21 Oct 2025US 12,448,777 B2Ecosourcen NV
- Platform system29 Apr 2025US 12,286,794 B2Safe Rack LLC
- Ceiling ladder, deep step and method14 Jan 2025US 12,196,041 B2Werner Co.
- Platform system11 Jun 2026US 2026/0160071 A1Safe Rack LLC
- Platform system28 May 2026US 2026/0146458 A1Safe Rack LLC
- Stairway, set of stairs and method for producing a set of stairs3 Apr 2025US 2025/0109595 A1Peri SE
- Ceiling ladder, deep step and method27 Mar 2025US 2025/0101806 A1Werner Co.
- Ceiling ladder, deep step and method4 Apr 2024US 2024/0110442 A1Werner Co.
Most cited
By later US patents
- Portable stairs with adjustable landing platform height82US 6,810,995 B22004
- Metal stairway for a residence22US 5,660,009 A1997
- Method and apparatus for a stair assembly21US 8,627,926 B22014
- Modular platform system20US 6,085,867 AAluminum Ladder Company · 2000
- Heating method and assembly for staircase20US 6,438,909 B1Tread Ex, Inc. · 2002