A63B 21/227
Changing the rotational direction alternately
Official title: {changing the rotational direction alternately}
A63B21/227 (Changing the rotational direction alternately) appears on 76 US grants and 58 published applications in this corpus.
Search patents in A63B- Granted patents
- 76
- Published applications
- 58
- Assignees
- 34
- Inventors
- 112
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 2 |
| 2003 | 5 | 0 |
| 2004 | 1 | 1 |
| 2005 | 1 | 2 |
| 2006 | 3 | 2 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 2 | 0 |
| 2011 | 0 | 2 |
| 2012 | 1 | 4 |
| 2013 | 0 | 1 |
| 2014 | 1 | 6 |
| 2015 | 5 | 2 |
| 2016 | 5 | 7 |
| 2017 | 5 | 5 |
| 2018 | 3 | 3 |
| 2019 | 3 | 5 |
| 2020 | 6 | 3 |
| 2021 | 0 | 4 |
| 2022 | 3 | 0 |
| 2023 | 1 | 2 |
| 2024 | 1 | 4 |
| 2025 | 4 | 2 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Multifunction excercise machine with ergometric input-responsive resistance118US 5,354,251 A1994
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- Inertial force, accommodating resistance exercise device and method69US 4,900,017 A1990
- Structure of climbing exerciser with a counter-weight freewheel mechanism65US 5,007,631 A1991
- Exercise machine59US 5,707,322 AConcept II, Inc. · 1998