H01F 38/085
Welding transformers
Official title: {Welding transformers}
H01F38/085 (Welding transformers) appears on 44 US grants and 45 published applications in this corpus.
Search patents in H01F- Granted patents
- 44
- Published applications
- 45
- Assignees
- 23
- Inventors
- 94
- Latest grant
- 27 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 2 |
| 2002 | 2 | 1 |
| 2003 | 1 | 1 |
| 2004 | 1 | 2 |
| 2005 | 3 | 4 |
| 2006 | 3 | 3 |
| 2007 | 1 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 0 |
| 2010 | 2 | 3 |
| 2011 | 2 | 1 |
| 2012 | 1 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 4 |
| 2015 | 2 | 0 |
| 2016 | 0 | 5 |
| 2017 | 2 | 1 |
| 2018 | 1 | 0 |
| 2019 | 4 | 2 |
| 2020 | 0 | 3 |
| 2021 | 1 | 3 |
| 2022 | 1 | 2 |
| 2023 | 2 | 0 |
| 2024 | 0 | 4 |
| 2025 | 2 | 2 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Low voltage high current power supply device27 Jan 2026US 12,537,130 B2Hefei Sanyu Electric Co., Ltd
- High-frequency transformers using solid wire for welding-type power supplies11 Nov 2025US 12,469,637 B2Illinois Tool Works Inc.
- Welding transformer16 Sep 2025US 12,417,873 B2Koyo Giken Inc.
- Welding current source30 May 2023US 11,660,696 B2Fronius International GmbH
- Balanced plate rectifiers and welding-type power supplies including balanced plate rectifiers30 May 2023US 11,660,697 B2Illinois Tool Works Inc.
- Low-leakage overmolded planar transformers for welding-type power supplies5 Jun 2025US 2025/0182955 A1Illinois Tool Works Inc.
- Low-leakage planar transformers for welding-type power supplies17 Apr 2025US 2025/0125080 A1Illinois Tool Works Inc.
- Welding transformer21 Nov 2024US 2024/0387097 A1Panasonic Intellectual Property Management Co., Ltd.
- Welding transformer21 Nov 2024US 2024/0387099 A1Panasonic Intellectual Property Management Co., Ltd.
- Device and method for carrying out a welding process26 Sep 2024US 2024/0316676 A1Fronius International GmbH
Most cited
By later US patents
- Transformer for arc and plasma setups having broad current adjustment range44US 4,737,704 A1988
- Shunt coil controlled transformer43US 5,187,428 AMiller Electric Mfg. Co. · 1993
- Welding transformer with drooping voltage-current characteristics39US 4,229,721 AInstytut Spawalnictwa · 1980
- Phase controlled transformer24US 5,363,035 AMiller Electric Mfg. Co. · 1994
- Welding power supply transformer21US 6,611,189 B2Illinois Tool Works Inc. · 2003