H01G 7/02
Electrets, i.e. having a permanently-polarised dielectric
H01G7/02 (Electrets, i.e. having a permanently-polarised dielectric) appears on 257 US grants and 167 published applications in this corpus.
Search patents in H01G- Granted patents
- 257
- Published applications
- 167
- Assignees
- 157
- Inventors
- 524
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 19 | 0 |
| 1977 | 9 | 0 |
| 1978 | 9 | 0 |
| 1979 | 3 | 0 |
| 1980 | 5 | 0 |
| 1981 | 12 | 0 |
| 1982 | 4 | 0 |
| 1983 | 7 | 0 |
| 1984 | 8 | 0 |
| 1985 | 5 | 0 |
| 1986 | 8 | 0 |
| 1987 | 6 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 6 | 0 |
| 1992 | 4 | 0 |
| 1993 | 3 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 6 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 5 | 1 |
| 2002 | 5 | 1 |
| 2003 | 2 | 3 |
| 2004 | 5 | 6 |
| 2005 | 1 | 3 |
| 2006 | 2 | 4 |
| 2007 | 3 | 7 |
| 2008 | 2 | 4 |
| 2009 | 4 | 5 |
| 2010 | 3 | 9 |
| 2011 | 4 | 16 |
| 2012 | 10 | 6 |
| 2013 | 6 | 9 |
| 2014 | 7 | 7 |
| 2015 | 5 | 5 |
| 2016 | 8 | 4 |
| 2017 | 6 | 10 |
| 2018 | 5 | 8 |
| 2019 | 7 | 10 |
| 2020 | 6 | 6 |
| 2021 | 8 | 15 |
| 2022 | 6 | 8 |
| 2023 | 7 | 4 |
| 2024 | 7 | 4 |
| 2025 | 4 | 7 |
| 2026 | 3 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for manufacturing vibration power generation device and vibration device21 Jul 2026US 12,689,312 B2Seiko Epson Corporation
- Storage device14 Jul 2026US 12,684,788 B2Kioxia Corporation
- Engineered dielectric meta-materials3 Mar 2026US 12,567,542 B2Drexel University
- Structure exhibiting a flexoelectric effect1 Jul 2025US 12,347,629 B2Murata Manufacturing Co., Ltd.
- Methods of saturating nonwoven fabrics with liquid and the making of electret thereof18 Mar 2025US 12,252,826 B2University of Tennessee Research Foundation
- Electret20 Aug 2026US 2026/0245806 A1Denso Corporation
- Electrets for power electronic applications30 Apr 2026US 2026/0120959 A1
- Electret12 Mar 2026US 2026/0074122 A1Denso Corporation
- Resin composition, and molded product and film using resin composition29 Jan 2026US 2026/0028471 A1Kuraray Co., Ltd.
- Laminated piezoelectric sheet15 Jan 2026US 2026/0019012 A1Mitsubishi Chemical Corporation
Most cited
By later US patents
- Melt-blown fibrous electrets387US 4,215,682 AMinnesota Mining and Manufacturing Company · 1980
- Method for manufacturing an electret filter medium243US 4,588,537 AMinnesota Mining and Manufacturing Company · 1986
- Method of making fibrous electrets241US 4,375,718 ASurgikos, Inc. · 1983
- Method of manufacturing an electret filter230US 4,592,815 AJapan Vilene Company, Ltd. · 1986
- Electret filter made of fibers containing polypropylene and poly(4-methyl-1-pentene)145US 4,874,399 AMinnesota Mining and Manufacturing Company · 1989