H02K 21/16
Having annular armature cores with salient poles
Official title: having annular armature cores with salient poles (with homopolar co-operation H02K21/20)
H02K21/16 (Having annular armature cores with salient poles) appears on 1,142 US grants and 1,504 published applications in this corpus.
Search patents in H02K- Granted patents
- 1,142
- Published applications
- 1,504
- Assignees
- 497
- Inventors
- 2,710
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 4 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 5 | 0 |
| 1995 | 5 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 7 | 0 |
| 1999 | 5 | 0 |
| 2000 | 15 | 0 |
| 2001 | 12 | 5 |
| 2002 | 20 | 31 |
| 2003 | 15 | 16 |
| 2004 | 16 | 31 |
| 2005 | 28 | 32 |
| 2006 | 27 | 39 |
| 2007 | 20 | 29 |
| 2008 | 23 | 33 |
| 2009 | 24 | 27 |
| 2010 | 24 | 27 |
| 2011 | 17 | 31 |
| 2012 | 13 | 26 |
| 2013 | 17 | 46 |
| 2014 | 29 | 48 |
| 2015 | 21 | 44 |
| 2016 | 25 | 46 |
| 2017 | 41 | 83 |
| 2018 | 47 | 72 |
| 2019 | 60 | 85 |
| 2020 | 67 | 120 |
| 2021 | 65 | 121 |
| 2022 | 107 | 123 |
| 2023 | 84 | 125 |
| 2024 | 116 | 118 |
| 2025 | 97 | 95 |
| 2026 | 62 | 51 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Electric motor187US 9,570,945 B2Grundfos Holding A/S · 2017
- Motor-operated window cover139US 5,467,266 ALutron Electronics Co., Inc. · 1995
- Permanent magnet field-type rotating machine128US 5,684,352 AHitachi Metals, Ltd. · 1997
- Motor105US 6,049,153 AMatsushita Electric Industrial Co., Ltd. · 2000
- Semi-frozen food product producing machine95US 6,220,047 B1IMI Cornelius Inc. · 2001