A61F 13/537

Characterised by a layer facilitating or inhibiting flow in one direction or

Official title: characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer {(A61F13/538 takes precedence)}

A61F13/537 (Characterised by a layer facilitating or inhibiting flow in one direction or) appears on 1,284 US grants and 1,167 published applications in this corpus.

Search patents in A61F

Granted patents: 1,284
Published applications: 1,167
Assignees: 265
Inventors: 2,299
Latest grant: 6 Oct 2026

Filings by year

A61F 13/537: granted patents and published applications per publication year
Year	Granted patents	Published applications
1976	7	0
1977	6	0
1978	7	0
1979	4	0
1980	7	0
1981	9	0
1982	10	0
1983	9	0
1984	6	0
1985	13	0
1986	12	0
1987	25	0
1988	14	0
1989	12	0
1990	14	0
1991	17	0
1992	15	0
1993	29	0
1994	39	0
1995	35	0
1996	40	0
1997	48	0
1998	48	0
1999	35	0
2000	27	0
2001	33	16
2002	53	43
2003	71	71
2004	36	53
2005	21	50
2006	19	39
2007	13	26
2008	11	26
2009	13	16
2010	23	18
2011	12	21
2012	18	38
2013	24	46
2014	27	34
2015	28	70
2016	32	58
2017	32	59
2018	23	59
2019	36	62
2020	47	68
2021	46	56
2022	33	63
2023	32	46
2024	48	47
2025	37	43
2026	28	39

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

Characterised by a layer facilitating or inhibiting flow in one direction or

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