A47J 31/4478
Spreader plates
Official title: {Spreader plates (as an accessory of the filter A47J31/0631)}
A47J31/4478 (Spreader plates) appears on 60 US grants and 57 published applications in this corpus.
Search patents in A47J- Granted patents
- 60
- Published applications
- 57
- Assignees
- 40
- Inventors
- 117
- Latest grant
- 28 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 1 |
| 2002 | 1 | 0 |
| 2003 | 2 | 3 |
| 2004 | 3 | 5 |
| 2005 | 2 | 2 |
| 2006 | 2 | 2 |
| 2007 | 1 | 2 |
| 2008 | 1 | 0 |
| 2009 | 2 | 1 |
| 2010 | 2 | 0 |
| 2011 | 1 | 2 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 0 | 0 |
| 2015 | 1 | 0 |
| 2016 | 0 | 10 |
| 2017 | 1 | 4 |
| 2018 | 5 | 7 |
| 2019 | 8 | 4 |
| 2020 | 2 | 2 |
| 2021 | 1 | 1 |
| 2022 | 2 | 1 |
| 2023 | 1 | 1 |
| 2024 | 1 | 4 |
| 2025 | 2 | 3 |
By publication year. Applications have been published since 2001.
Recent patents
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- Group head vortex shower19 Sep 2024US 2024/0306837 A1I Cherng Refrigeration Industrial Co., Ltd.
Most cited
By later US patents
- Fluid delivery system for generating pressure pulses to make beverages99US 6,405,637 B1Houseware Technology Group · 2002
- Coffee brewer and hot water dispenser57US 5,836,236 A1998
- Coffee brewer56US 6,843,165 B2Sto AG · 2005
- Spray head for coffee brewer51US 6,244,162 B1Grindmaster Corporation · 2001
- Hot beverage brewing apparatus48US 5,353,692 AUnidynamics Corporation · 1994