H01F 38/04
For frequency changing
Official title: for frequency changing
H01F38/04 (For frequency changing) appears on 13 US grants and 4 published applications in this corpus.
Search patents in H01F- Granted patents
- 13
- Published applications
- 4
- Assignees
- 13
- Inventors
- 28
- Latest grant
- 29 Oct 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 2 | 1 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 1 |
| 2020 | 1 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 0 |
| 2023 | 1 | 1 |
| 2024 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Self mixing frequency doubler tripler circuits for wireless communication29 Oct 2024US 12,132,512 B2Swiftlink Technologies Inc.
- Electrical power distribution network and process25 Apr 2023US 11,637,429 B2Third Equation Ltd
- Electrical power distribution network and process11 Aug 2020US 10,742,035 B2Third Equation Ltd
- Medium voltage power converter formed using low voltage drives11 Dec 2007US 7,307,361 B1DRS Power & Control Technologies, Inc.
- Transformer with voltage regulating means7 Feb 2006US 6,995,646 B1ABB AB
- Self Mixing Frequency Doubler Tripler Circuits for Wireless Communication7 Sep 2023US 2023/0283317 A1Swiftlink Technologies Inc.
- Electrical power distribution network and process10 Jun 2021US 2021/0175712 A1Third Equation Ltd
- Electrical power distribution network and process10 Oct 2019US 2019/0312430 A1Faraday Grid Limited
- Rotating variable frequency transformer with high voltage cables16 May 2002US 2002/0057027 A1General Electric Company
Most cited
By later US patents
- Transformer with voltage regulating means38US 6,995,646 B1ABB AB · 2006
- Medium voltage power converter formed using low voltage drives12US 7,307,361 B1DRS Power & Control Technologies, Inc. · 2007
- Envelope for slip-ring contacting members in high-power rotary current collector system10US 6,472,791 B1General Electric Copmay · 2002
- Circuit for the production of an open alternating magnetic field6US 4,035,745 ASachs-Systemtechnik GmbH · 1977
- Rotating variable frequency transformer with high voltage cables3US 6,456,021 B1General Electric Company · 2002