B66B 21/06
Spiral type
Official title: spiral type
B66B21/06 (Spiral type) appears on 32 US grants and 7 published applications in this corpus.
Search patents in B66B- Granted patents
- 32
- Published applications
- 7
- Assignees
- 8
- Inventors
- 33
- Latest grant
- 5 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 3 | 0 |
| 1990 | 4 | 0 |
| 1991 | 6 | 0 |
| 1992 | 4 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 1 |
| 2016 | 0 | 2 |
| 2017 | 1 | 0 |
| 2018 | 2 | 0 |
| 2019 | 0 | 1 |
| 2020 | 0 | 1 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Variable speed moving walkway systems5 Aug 2025US 12,378,097 B2Beltways Inc.
- System of hexagonal building units and escalators or moving walkways used therein28 Aug 2018US 10,059,568 B2
- Robotic step transfer system for connecting ascending and descending spiral escalator steps27 Mar 2018US 9,926,173 B1
- Helical escalator system24 Jan 2017US 9,550,654 B2
- Escalator for negotiating curves31 May 2005US 6,899,216 B2Levytator Limited
- Variable speed moving walkway systems26 Mar 2020US 2020/0095097 A1Beltways Inc.
- System of hexagonal building units and escalators or moving walkways used therein28 Feb 2019US 2019/0062121 A1
- Helical escalator system22 Dec 2016US 2016/0368740 A1
- System of hexagonal building units and escalators or moving walkways used therein8 Sep 2016US 2016/0257531 A1
- Duo spiral escalator with curved return12 Mar 2015US 2015/0068864 A1
Most cited
By later US patents
- Curved escalator16US 4,746,000 AMitsubishi Denki Kabushiki Kaisha · 1988
- Curved escalator15US 4,662,502 AMitsubishi Denki Kabushiki Kaisha · 1987
- Curved escalator14US 4,730,717 AMitsubishi Denki Kabushiki Kaisha · 1988
- Curved escalator12US 4,809,840 AMitsubishi Denki Kabushiki Kaisha · 1989
- Curved escalator with fixed center constant radius path of travel12US 4,884,673 AOtis Elevator Company · 1989