A61H 2201/1223
Frequency controlled ac motor
Official title: Frequency controlled AC motor
A61H2201/1223 (Frequency controlled ac motor) appears on 52 US grants and 89 published applications in this corpus.
Search patents in A61H- Granted patents
- 52
- Published applications
- 89
- Assignees
- 50
- Inventors
- 149
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 2 |
| 2015 | 0 | 2 |
| 2016 | 2 | 5 |
| 2017 | 2 | 8 |
| 2018 | 7 | 17 |
| 2019 | 4 | 11 |
| 2020 | 16 | 9 |
| 2021 | 7 | 7 |
| 2022 | 4 | 6 |
| 2023 | 4 | 5 |
| 2024 | 1 | 8 |
| 2025 | 2 | 5 |
| 2026 | 3 | 3 |
By publication year. 2026 runs to 8 Oct.
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Most cited
By later US patents