H02K 3/22
Consisting of hollow conductors
Official title: consisting of hollow conductors
H02K3/22 (Consisting of hollow conductors) appears on 122 US grants and 117 published applications in this corpus.
Search patents in H02K- Granted patents
- 122
- Published applications
- 117
- Assignees
- 83
- Inventors
- 343
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 2 | 2 |
| 2004 | 3 | 1 |
| 2005 | 1 | 3 |
| 2006 | 1 | 3 |
| 2007 | 3 | 1 |
| 2008 | 2 | 2 |
| 2009 | 2 | 3 |
| 2010 | 1 | 2 |
| 2011 | 3 | 0 |
| 2012 | 1 | 1 |
| 2013 | 1 | 1 |
| 2014 | 1 | 6 |
| 2015 | 0 | 5 |
| 2016 | 2 | 2 |
| 2017 | 3 | 5 |
| 2018 | 4 | 6 |
| 2019 | 2 | 4 |
| 2020 | 7 | 11 |
| 2021 | 5 | 11 |
| 2022 | 10 | 10 |
| 2023 | 7 | 9 |
| 2024 | 15 | 11 |
| 2025 | 1 | 9 |
| 2026 | 3 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hollow copper electrical conductors2 Jun 2026US 12,646,988 B2GM Global Technology Operations LLC
- Electrical conductor cooled by phase change material and method for the manufacture thereof24 Feb 2026US 12,562,611 B2Safran
- Two-phase liquid-cooled alternating current (AC) rotating electrical machine10 Feb 2026US 12,549,073 B2Raytheon Company
- Core, stator, and rotating electric device25 Feb 2025US 12,237,718 B2Sumitomo Electric Industries, Ltd.
- Stator of an electric machine and an electric machine17 Dec 2024US 12,170,470 B2Lappeenrannan-Lahden Teknillinen Yliopisto Lut
- Improvements relating to cooling of electric machines8 Oct 2026US 2026/0312450 A1Vestas Wind Systems A/S
- Fluid Cooled Heat Pipe Thermal Management System for an Electric Motor13 Aug 2026US 2026/0238088 A1Marquette University
- Cooling a stator of an axial flux induction machine6 Aug 2026US 2026/0229960 A1Aura Systems, Inc.
- Electric machine30 Jul 2026US 2026/0221828 A1Safran Electrical and Power UK Ltd
- Sandwich-type connection device for connecting the hollow conductors of an internally cooled electric machine and electric machine comprising a connection device of this type2 Jul 2026US 2026/0189094 A1Dynamic E Flow GmbH
Most cited
By later US patents
- Method and apparatus for registering a known digital object to scanned 3-D model73US 7,471,821 B2OraMetrix, Inc. · 2008
- Ventilated end turns for rotor windings of a dynamoelectric machine43US 4,543,503 AGeneral Electric Company · 1985
- Switched reluctance starter/generator39US 5,489,810 ASundstrand Corporation · 1996
- Ventilated end turns for rotor windings of a dynamoelectric machine37US 4,709,177 AGeneral Electric Company · 1987
- Peripheral connector ring stator end winding for dynamoelectric machines33US 4,321,497 AWestinghouse Electric Corp. · 1982