H04R 23/004
Transducers other than those covered by groups h04r9/00 - h04r21/00: using ionised
Official title: {using ionised gas}
H04R23/004 (Transducers other than those covered by groups h04r9/00 - h04r21/00: using ionised) appears on 27 US grants and 17 published applications in this corpus.
Search patents in H04R- Granted patents
- 27
- Published applications
- 17
- Assignees
- 10
- Inventors
- 41
- Latest grant
- 25 Feb 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 1 |
| 2011 | 2 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 0 | 1 |
| 2015 | 1 | 1 |
| 2016 | 3 | 0 |
| 2017 | 2 | 1 |
| 2018 | 2 | 0 |
| 2019 | 2 | 5 |
| 2020 | 2 | 1 |
| 2021 | 0 | 0 |
| 2022 | 1 | 1 |
| 2023 | 2 | 2 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Methods and apparatus to communicate via a welding arc25 Feb 2025US 12,233,489 B2Illinois Tool Works Inc.
- Plasma based noise reduction system17 Oct 2023US 11,790,881 B2Ecole Polytechnique Federale De Lausanne (Epfl)
- Methods and apparatus to communicate via a welding arc8 Aug 2023US 11,717,905 B2Illinois Tool Works Inc.
- Tunable electrostatic ion and fluid flow generator and electroacoustic transducer15 Mar 2022US 11,273,465 B1
- Methods and apparatus to communicate via a welding arc24 Mar 2020US 10,596,651 B2Illinois Tool Works Inc.
- Methods and apparatus to communicate via a welding arc30 Nov 2023US 2023/0381880 A1Illinois Tool Works Inc.
- Plasma based noise reduction system19 Jan 2023US 2023/0020879 A1Ecole Polytechnique Federale De Lausanne (Epfl)
- Tunable electrostatic ion and fluid flow generator and electroacoustic transducer17 Mar 2022US 2022/0080459 A1
- Methods and apparatus to communicate via a welding arc9 Jul 2020US 2020/0215637 A1Illinois Tool Works Inc.
- Electroacoustic transducer with axial electric field1 Aug 2019US 2019/0239002 A1Aga Ad Media, LLP
Most cited
By later US patents
- Electrokinetic transducing methods and apparatus and systems comprising or utilizing the same130US 4,789,801 AZenion Industries, Inc. · 1988
- Photothermal acoustic device53US 5,694,477 A1997
- Method and apparatus for transmitting information using arc11US 5,220,246 AMitsubishi Jukogyo Kabushiki Kaisha · 1993
- Process and device for converting a periodic LF electric voltage into sound waves8US 4,460,809 A1984
- Electroacoustic transducer having controlled ion generation8US 9,445,202 B1Aga Ad Media, LLP · 2016