H02K 21/145
Having an annular armature coil
Official title: {having an annular armature coil (with homopolar co-operation H02K21/20)}
H02K21/145 (Having an annular armature coil) appears on 223 US grants and 237 published applications in this corpus.
Search patents in H02K- Granted patents
- 223
- Published applications
- 237
- Assignees
- 139
- Inventors
- 471
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 9 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 3 | 0 |
| 1982 | 6 | 0 |
| 1983 | 4 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 7 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 4 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 3 |
| 2002 | 2 | 7 |
| 2003 | 6 | 2 |
| 2004 | 9 | 13 |
| 2005 | 8 | 5 |
| 2006 | 8 | 3 |
| 2007 | 1 | 6 |
| 2008 | 2 | 15 |
| 2009 | 2 | 12 |
| 2010 | 15 | 9 |
| 2011 | 7 | 11 |
| 2012 | 8 | 6 |
| 2013 | 8 | 10 |
| 2014 | 7 | 27 |
| 2015 | 5 | 8 |
| 2016 | 8 | 6 |
| 2017 | 10 | 10 |
| 2018 | 4 | 9 |
| 2019 | 13 | 11 |
| 2020 | 11 | 17 |
| 2021 | 6 | 6 |
| 2022 | 10 | 8 |
| 2023 | 6 | 13 |
| 2024 | 4 | 8 |
| 2025 | 7 | 11 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Permanent magnetized synchronous machine designed according to the transverse flux principle72US 5,117,142 A501 Ibk AB · 1992
- Reflective switch63US 6,057,554 A2000
- Electric power generating system using ring-shaped generators60US 7,425,772 B22008
- Stator arrangement for small motors56US 4,381,465 ASiemens Aktiengesellschaft · 1983
- Flux focusing arrangement for permanent magnets, methods of fabricating such arrangements, and machines including such arrangements50US 8,400,038 B2Boulder Wind Power, Inc. · 2013