E04H 4/12

Devices or arrangements for circulating water , i.e. devices for removal of

Official title: Devices or arrangements for circulating water {, i.e. devices for removal of polluted water, cleaning baths or for water treatment}

E04H4/12 (Devices or arrangements for circulating water , i.e. devices for removal of) appears on 1,595 US grants and 1,530 published applications in this corpus.

Search patents in E04H

Granted patents: 1,595
Published applications: 1,530
Assignees: 496
Inventors: 2,113
Latest grant: 6 Oct 2026

Filings by year

E04H 4/12: granted patents and published applications per publication year
Year	Granted patents	Published applications
1976	14	0
1977	10	0
1978	22	0
1979	11	0
1980	14	0
1981	9	0
1982	10	0
1983	18	0
1984	16	0
1985	12	0
1986	10	0
1987	17	0
1988	19	0
1989	22	0
1990	18	0
1991	11	0
1992	18	0
1993	20	0
1994	18	0
1995	14	0
1996	18	0
1997	19	0
1998	29	0
1999	31	0
2000	27	0
2001	25	5
2002	26	20
2003	19	21
2004	20	40
2005	20	34
2006	31	48
2007	21	35
2008	21	38
2009	20	35
2010	23	39
2011	29	39
2012	34	44
2013	29	57
2014	31	61
2015	34	64
2016	55	64
2017	55	95
2018	76	77
2019	93	92
2020	83	85
2021	89	94
2022	71	86
2023	77	94
2024	53	83
2025	73	99
2026	60	81

By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.

Devices or arrangements for circulating water , i.e. devices for removal of

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