B04C 5/14
Construction of the underflow ducting
Official title: Construction of the underflow ducting; Apex constructions; Discharge arrangements {; discharge through sidewall provided with a few slits or perforations (provided with a great number of slits or perforations B04C5/10)}
B04C5/14 (Construction of the underflow ducting) appears on 689 US grants and 654 published applications in this corpus.
Search patents in B04C- Granted patents
- 689
- Published applications
- 654
- Assignees
- 386
- Inventors
- 1,211
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 4 | 0 |
| 1980 | 11 | 0 |
| 1981 | 8 | 0 |
| 1982 | 11 | 0 |
| 1983 | 6 | 0 |
| 1984 | 7 | 0 |
| 1985 | 6 | 0 |
| 1986 | 6 | 0 |
| 1987 | 4 | 0 |
| 1988 | 10 | 0 |
| 1989 | 8 | 0 |
| 1990 | 2 | 0 |
| 1991 | 8 | 0 |
| 1992 | 13 | 0 |
| 1993 | 12 | 0 |
| 1994 | 10 | 0 |
| 1995 | 6 | 0 |
| 1996 | 5 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 5 | 0 |
| 2000 | 1 | 0 |
| 2001 | 10 | 3 |
| 2002 | 6 | 6 |
| 2003 | 13 | 9 |
| 2004 | 15 | 15 |
| 2005 | 7 | 17 |
| 2006 | 7 | 31 |
| 2007 | 11 | 26 |
| 2008 | 18 | 20 |
| 2009 | 22 | 27 |
| 2010 | 22 | 27 |
| 2011 | 24 | 11 |
| 2012 | 16 | 14 |
| 2013 | 23 | 22 |
| 2014 | 13 | 29 |
| 2015 | 23 | 25 |
| 2016 | 18 | 23 |
| 2017 | 23 | 32 |
| 2018 | 20 | 36 |
| 2019 | 28 | 45 |
| 2020 | 35 | 62 |
| 2021 | 38 | 32 |
| 2022 | 39 | 39 |
| 2023 | 31 | 27 |
| 2024 | 29 | 33 |
| 2025 | 22 | 18 |
| 2026 | 13 | 25 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
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Most cited
By later US patents
- Process and apparatus for separating diluents from solid polymers utilizing a two-stage flash and a cyclone separator494US 5,575,979 APhillips Petroleum Company · 1996
- Vacuum cleaner having a cyclone type dust collecting apparatus333US 6,406,505 B1Samsung Kwangju Electronics Co., Ltd. · 2002
- Apparatus and method for separating particles from a cyclonic fluid flow270US 6,251,296 B1G. B. D. Corp. · 2001
- Apparatus and method separating particles from a cyclonic fluid flow including an apertured particle separation member within a cyclonic flow region240US 6,440,197 B1G. B. D. Corp. · 2002
- Handheld cleaning appliance235US 8,156,609 B2Dyson Technology Limited · 2012