B03C 3/011
Prefiltering
Official title: Prefiltering; Flow controlling
B03C3/011 (Prefiltering) appears on 125 US grants and 166 published applications in this corpus.
Search patents in B03C- Granted patents
- 125
- Published applications
- 166
- Assignees
- 105
- Inventors
- 358
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 2 |
| 2003 | 2 | 3 |
| 2004 | 2 | 2 |
| 2005 | 3 | 2 |
| 2006 | 2 | 7 |
| 2007 | 4 | 3 |
| 2008 | 2 | 3 |
| 2009 | 3 | 3 |
| 2010 | 3 | 1 |
| 2011 | 1 | 5 |
| 2012 | 1 | 4 |
| 2013 | 2 | 2 |
| 2014 | 3 | 10 |
| 2015 | 4 | 6 |
| 2016 | 6 | 5 |
| 2017 | 7 | 4 |
| 2018 | 7 | 8 |
| 2019 | 5 | 6 |
| 2020 | 1 | 5 |
| 2021 | 3 | 17 |
| 2022 | 5 | 21 |
| 2023 | 6 | 22 |
| 2024 | 10 | 15 |
| 2025 | 11 | 5 |
| 2026 | 2 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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Most cited
By later US patents
- Air-treatment apparatus and methods101US 6,955,708 B1Shaklee Corporation · 2005
- Compact air purifier unit88US 4,597,781 A1986
- Electrostatic separator64US 4,588,423 ADonaldson Company, Inc. · 1986
- Method for ionizing gases, electrostatically charging particles, and electrostatically charging particles or ionizing gases for removing contaminants from gas streams63US 4,110,086 AAir Pollution Systems, Inc. · 1978
- Improved air ionizing apparatus61US 5,407,469 ASunova Company · 1995