B21D 51/16

Making hollow objects: characterised by the use of the objects

Official title: characterised by the use of the objects (making heat exchangers B21D53/02)

B21D51/16 (Making hollow objects: characterised by the use of the objects) appears on 2,321 US grants and 1,723 published applications in this corpus.

Search patents in B21D

Granted patents: 2,321
Published applications: 1,723
Assignees: 884
Inventors: 3,406
Latest grant: 8 Sep 2026

Filings by year

B21D 51/16: granted patents and published applications per publication year
Year	Granted patents	Published applications
1976	63	0
1977	63	0
1978	57	0
1979	28	0
1980	54	0
1981	38	0
1982	22	0
1983	33	0
1984	34	0
1985	52	0
1986	41	0
1987	36	0
1988	39	0
1989	41	0
1990	39	0
1991	48	0
1992	55	0
1993	41	0
1994	50	0
1995	17	0
1996	30	0
1997	47	0
1998	61	0
1999	50	0
2000	40	0
2001	34	6
2002	42	22
2003	29	37
2004	33	41
2005	19	40
2006	29	44
2007	20	43
2008	28	60
2009	27	41
2010	31	92
2011	35	50
2012	41	61
2013	51	89
2014	56	101
2015	60	107
2016	72	74
2017	83	83
2018	67	86
2019	67	91
2020	72	71
2021	69	77
2022	51	79
2023	57	86
2024	69	98
2025	66	80
2026	34	64

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

Making hollow objects: characterised by the use of the objects

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