B03C 3/28
Plant or installations without electricity supply
Official title: Plant or installations without electricity supply, e.g. using electrets
B03C3/28 (Plant or installations without electricity supply) appears on 251 US grants and 234 published applications in this corpus.
Search patents in B03C- Granted patents
- 251
- Published applications
- 234
- Assignees
- 150
- Inventors
- 505
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 5 | 0 |
| 1994 | 5 | 0 |
| 1995 | 9 | 0 |
| 1996 | 6 | 0 |
| 1997 | 12 | 0 |
| 1998 | 10 | 0 |
| 1999 | 12 | 0 |
| 2000 | 7 | 0 |
| 2001 | 7 | 2 |
| 2002 | 11 | 7 |
| 2003 | 8 | 3 |
| 2004 | 6 | 8 |
| 2005 | 3 | 4 |
| 2006 | 4 | 3 |
| 2007 | 1 | 4 |
| 2008 | 5 | 6 |
| 2009 | 2 | 4 |
| 2010 | 2 | 12 |
| 2011 | 6 | 14 |
| 2012 | 8 | 12 |
| 2013 | 9 | 9 |
| 2014 | 3 | 10 |
| 2015 | 9 | 11 |
| 2016 | 5 | 8 |
| 2017 | 6 | 8 |
| 2018 | 9 | 9 |
| 2019 | 4 | 2 |
| 2020 | 6 | 9 |
| 2021 | 6 | 28 |
| 2022 | 6 | 32 |
| 2023 | 5 | 9 |
| 2024 | 8 | 6 |
| 2025 | 10 | 10 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Electret and filter using the same28 Apr 2026US 12,611,650 B2TOYOBO MC Corporation
- Foreign substrate collector for a laundry appliance14 Apr 2026US 12,601,103 B2Whirlpool Corporation
- Mechanical electrostatic filter assembly30 Dec 2025US 12,508,530 B2
- Composite fiber18 Nov 2025US 12,472,451 B2Murata Manufacturing Co., Ltd.
- Substituted benzimidazole melt additives11 Nov 2025US 12,467,174 B23M Innovative Properties Company
- Foreign substrate collector for a laundry appliance23 Jul 2026US 2026/0210026 A1Whirlpool Corporation
- Electret-containing filter media30 Apr 2026US 2026/0115638 A1Hollingsworth & Vose Company
- Polyethylene resin composition, meltblown nonwoven fabric using the same, and electret material19 Mar 2026US 2026/0078245 A1TOYOBO MC Corporation
- Electret melt blown nonwoven fabric and air filter material using the same8 Jan 2026US 2026/0009173 A1Toray Industries, Inc.
- Cooking apparatus ventilation system including oil-smoke collection filter18 Sep 2025US 2025/0288934 A1Samsung Electronics Co., Ltd.
Most cited
By later US patents
- Melt-blown fibrous electrets387US 4,215,682 AMinnesota Mining and Manufacturing Company · 1980
- 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
- Method and apparatus for the electrostatic charging of a web or film195US 5,401,446 AThe University of Tennessee Research Corporation · 1995
- Post-treatment of nonwoven webs153US 5,244,482 AThe University of Tennessee Research Corporation · 1993