B03C 3/04
Dry type
Official title: dry type
B03C3/04 (Dry type) appears on 1,126 US grants and 1,179 published applications in this corpus.
Search patents in B03C- Granted patents
- 1,126
- Published applications
- 1,179
- Assignees
- 666
- Inventors
- 2,120
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 13 | 0 |
| 1977 | 10 | 0 |
| 1978 | 8 | 0 |
| 1979 | 8 | 0 |
| 1980 | 7 | 0 |
| 1981 | 15 | 0 |
| 1982 | 14 | 0 |
| 1983 | 7 | 0 |
| 1984 | 9 | 0 |
| 1985 | 11 | 0 |
| 1986 | 8 | 0 |
| 1987 | 13 | 0 |
| 1988 | 13 | 0 |
| 1989 | 10 | 0 |
| 1990 | 19 | 0 |
| 1991 | 14 | 0 |
| 1992 | 10 | 0 |
| 1993 | 10 | 0 |
| 1994 | 16 | 0 |
| 1995 | 15 | 0 |
| 1996 | 13 | 0 |
| 1997 | 19 | 0 |
| 1998 | 16 | 0 |
| 1999 | 12 | 0 |
| 2000 | 14 | 0 |
| 2001 | 14 | 4 |
| 2002 | 17 | 24 |
| 2003 | 19 | 26 |
| 2004 | 19 | 46 |
| 2005 | 25 | 34 |
| 2006 | 27 | 54 |
| 2007 | 32 | 39 |
| 2008 | 29 | 44 |
| 2009 | 35 | 48 |
| 2010 | 35 | 53 |
| 2011 | 31 | 58 |
| 2012 | 32 | 39 |
| 2013 | 51 | 47 |
| 2014 | 33 | 33 |
| 2015 | 32 | 36 |
| 2016 | 25 | 43 |
| 2017 | 35 | 46 |
| 2018 | 29 | 48 |
| 2019 | 40 | 46 |
| 2020 | 34 | 61 |
| 2021 | 42 | 71 |
| 2022 | 36 | 88 |
| 2023 | 33 | 70 |
| 2024 | 49 | 53 |
| 2025 | 50 | 50 |
| 2026 | 18 | 18 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B03C 3/14Characterised by the additional use of mechanical effects496
- B03C 3/12Characterised by separation of ionising and collecting stations414
- B03C 3/08Characterised by presence of stationary flat electrodes arranged with their flat surfaces325
- B03C 3/09Characterised by presence of stationary flat electrodes arranged with their flat surfaces184
- B03C 3/06Characterised by presence of stationary tube electrodes123
- B03C 3/10Characterised by presence of electrodes moving during separating action38
Recent patents
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- Dust collection sheet and electrostatic precipitator18 Aug 2026US 12,708,911 B2Samsung Electronics Co., Ltd.
- Hybrid filter unit8 Oct 2026US 2026/0307082 A1Brairtech Sweden AB
- Air conditioner17 Sep 2026US 2026/0276225 A1Samsung Electronics Co., Ltd.
- Ducted Ventilation System, Particle Collection Unit and Method30 Jul 2026US 2026/0218929 A1E. Khoury Holding B.V.
- Devices and methods to reduce air pollution and global warming23 Jul 2026US 2026/0208207 A1Temple University of the Commonwealth System of Higher Education
- Electric dust-collecting filter23 Jul 2026US 2026/0208208 A1Hanon Systems
Most cited
By later US patents
- Electric filter135US 4,077,784 A1978
- Air purification electrostatic charcoal filter and method132US 4,244,710 A1981
- Air cleaner using ionic wind123US 4,643,745 ANippon Soken, Inc. · 1987
- Electro-kinetic air transporter-conditioner122US 6,176,977 B1Sharper Image Corporation · 2001
- Method and apparatus for electrostatically cleaning particulates from air121US 5,330,559 AUnited Air Specialists, Inc. · 1994