E04F 11/02
Stairways
Official title: Stairways; Layouts thereof
E04F11/02 (Stairways) appears on 868 US grants and 748 published applications in this corpus.
Search patents in E04F- Granted patents
- 868
- Published applications
- 748
- Assignees
- 415
- Inventors
- 1,332
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 11 | 0 |
| 1978 | 11 | 0 |
| 1979 | 8 | 0 |
| 1980 | 4 | 0 |
| 1981 | 10 | 0 |
| 1982 | 12 | 0 |
| 1983 | 10 | 0 |
| 1984 | 7 | 0 |
| 1985 | 13 | 0 |
| 1986 | 12 | 0 |
| 1987 | 10 | 0 |
| 1988 | 8 | 0 |
| 1989 | 19 | 0 |
| 1990 | 8 | 0 |
| 1991 | 14 | 0 |
| 1992 | 16 | 0 |
| 1993 | 9 | 0 |
| 1994 | 8 | 0 |
| 1995 | 11 | 0 |
| 1996 | 12 | 0 |
| 1997 | 11 | 0 |
| 1998 | 21 | 0 |
| 1999 | 18 | 0 |
| 2000 | 25 | 0 |
| 2001 | 11 | 5 |
| 2002 | 15 | 29 |
| 2003 | 21 | 28 |
| 2004 | 22 | 32 |
| 2005 | 23 | 32 |
| 2006 | 10 | 29 |
| 2007 | 11 | 26 |
| 2008 | 9 | 32 |
| 2009 | 14 | 33 |
| 2010 | 15 | 34 |
| 2011 | 21 | 29 |
| 2012 | 26 | 30 |
| 2013 | 23 | 25 |
| 2014 | 32 | 31 |
| 2015 | 27 | 27 |
| 2016 | 23 | 31 |
| 2017 | 28 | 18 |
| 2018 | 24 | 40 |
| 2019 | 37 | 33 |
| 2020 | 27 | 34 |
| 2021 | 21 | 33 |
| 2022 | 24 | 32 |
| 2023 | 33 | 36 |
| 2024 | 24 | 28 |
| 2025 | 32 | 27 |
| 2026 | 17 | 14 |
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.
- Foldable stair assembly8 Sep 2026US 12,728,899 B2Safesmart LLC
- Modular staircase1 Sep 2026US 12,723,410 B2NxGen Homes Pty Ltd
- Precast concrete stairway construction method25 Aug 2026US 12,716,243 B2Easycore Co., Ltd.
- Portable staircase21 Jul 2026US 12,687,023 B1
- Book matched stair tread and method of manufacture1 Oct 2026US 2026/0297953 A1
- Folding staircase10 Sep 2026US 2026/0266060 A1Calbah Industries Pty Ltd
- Modular Mining Escapeway9 Jul 2026US 2026/0193986 A1RAM Enterprise, Inc.
- Modular construction connection mechanism2 Jul 2026US 2026/0185358 A1Prefabricated Design Systems, LLC
- Assembly method for bath steps2 Jul 2026US 2026/0185359 A1Guangzhou Taisheng Sanitary Ware Technology Co.,Ltd
Most cited
By later US patents
- Integrally formed linear light strip with light emitting diodes362US 5,848,837 AStanTech · 1998
- Glider bar for flooring system220US 6,134,854 APerstorp AB · 2000
- Integrally formed linear light strip with light emitting diodes207US 5,927,845 AStanTech · 1999
- Portable dance floor196US 5,634,309 A1997
- Emergency lighting strip157US 5,130,909 AWickes Manufacturing Company · 1992