A63B 21/28
Devices for two persons operating in opposition or in cooperation
Official title: Devices for two persons operating in opposition {or in cooperation}
A63B21/28 (Devices for two persons operating in opposition or in cooperation) appears on 192 US grants and 176 published applications in this corpus.
Search patents in A63B- Granted patents
- 192
- Published applications
- 176
- Assignees
- 52
- Inventors
- 271
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 4 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 5 | 0 |
| 1998 | 8 | 0 |
| 1999 | 1 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 0 |
| 2002 | 2 | 3 |
| 2003 | 2 | 8 |
| 2004 | 1 | 5 |
| 2005 | 3 | 2 |
| 2006 | 2 | 2 |
| 2007 | 4 | 9 |
| 2008 | 2 | 6 |
| 2009 | 3 | 3 |
| 2010 | 4 | 6 |
| 2011 | 1 | 5 |
| 2012 | 4 | 4 |
| 2013 | 4 | 11 |
| 2014 | 6 | 6 |
| 2015 | 5 | 7 |
| 2016 | 6 | 17 |
| 2017 | 8 | 10 |
| 2018 | 8 | 11 |
| 2019 | 10 | 10 |
| 2020 | 8 | 12 |
| 2021 | 8 | 12 |
| 2022 | 10 | 11 |
| 2023 | 12 | 4 |
| 2024 | 6 | 8 |
| 2025 | 5 | 1 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Collaborative exercise17 Mar 2026US 12,576,311 B2Tonal Systems, Inc.
- Resistance band exercise machine30 Dec 2025US 12,508,461 B1OK Engineering Inc.
- Resistance training system and assisted training method23 Dec 2025US 12,502,573 B2
- Double retractable rowing resistance system with configurable and convertible swinging seat-based exercise machine13 May 2025US 12,296,221 B2
- Spotting system for weight lifting15 Apr 2025US 12,274,906 B2Powerlifting Ultra Support Systems, LLC
- Apparatus and method for assisting with operation of exercise equipment2 Jul 2026US 2026/0183602 A1Trowforce, LLC
- Fitness toy and fitness method30 Apr 2026US 2026/0115519 A1
- Resistance Training System and Method16 Apr 2026US 2026/0102649 A1
- Stretching Device and Methods Relating to Same8 May 2025US 2025/0144465 A1
- Spotting bar for weight lifting and method of use7 Nov 2024US 2024/0366991 A1PowerLifting Ultra Support Systems, LLC, dba PLUS Systems
Most cited
By later US patents
- Variable resistance exercise device236US 6,027,429 ANordicTrack, Inc. · 2000
- Variable resistance exercise device180US 5,409,435 A1995
- Exercise device159US 7,931,570 B2Balanced Body, Inc. · 2011
- Devices and methods for evaluating athletic performance142US 5,605,336 A1997
- Variable resistance exercise device137US 5,762,584 ANordicTrack, Inc. · 1998