B66B 9/0869
Collapsible stairways
Official title: {Collapsible stairways, e.g. operable between a lower level and an upper level}
B66B9/0869 (Collapsible stairways) appears on 32 US grants and 22 published applications in this corpus.
Search patents in B66B- Granted patents
- 32
- Published applications
- 22
- Assignees
- 14
- Inventors
- 59
- Latest grant
- 13 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 2 |
| 2006 | 3 | 3 |
| 2007 | 2 | 1 |
| 2008 | 2 | 1 |
| 2009 | 1 | 0 |
| 2010 | 0 | 1 |
| 2011 | 2 | 3 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 5 | 0 |
| 2015 | 1 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 1 | 1 |
| 2020 | 0 | 1 |
| 2021 | 2 | 3 |
| 2022 | 0 | 1 |
| 2023 | 1 | 2 |
| 2024 | 2 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Staircase with instrumented steps with lifting actuator for assisted ascent or descent13 Jan 2026US 12,523,043 B2Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- Stair assistance device and system9 Jul 2024US 12,030,746 B2
- Convertible stairs for wheelchair accessibility25 Jun 2024US 12,017,889 B1Kuwait University
- Energy-efficient assistive stairs21 Mar 2023US 11,608,641 B2Emory University
- Mobility aid device for overcoming a level difference31 Aug 2021US 11,104,548 B2
- Elongated ramp in lifting system for a stairway1 May 2025US 2025/0136412 A1Liftup A/S
- Staircase with instrumented steps with lifting actuator for assisted ascent or descent14 Dec 2023US 2023/0399852 A1Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- Stair Assistance Device and System17 Aug 2023US 2023/0257232 A1
- Control Systems and Methods to Provide Sensor-Based Control3 Mar 2022US 2022/0063960 A1Evermore Systems Inc.
- Energy-efficient assistive stairs9 Sep 2021US 2021/0277661 A1Georgia Tech Research Corporation
Most cited
By later US patents
- Wheelchair lift43US 4,457,402 ALipstep Design Group Corp. · 1984
- Convertible lift mechanism having a scissor lift linkage28US 6,109,395 AVertical Mobility LLC · 2000
- Convertible lift mechanism having a number of retractable stairs with a lift platform positioned thereunder20US 6,601,677 B1Vertical Mobility LLC · 2003
- Combined stairs and person hoist17US 5,632,357 A1997
- Operable step15US 8,739,342 B1Life-U, Division of Hogan Mfg., Inc. · 2014