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E21D 23/087

Acting directly on the walls of the seam

Official title: {acting directly on the walls of the seam}

E21D23/087 (Acting directly on the walls of the seam) appears on 12 US grants and 2 published applications in this corpus.

Search patents in E21D

Granted patents: 12
Published applications: 2
Assignees: 6
Inventors: 14
Latest grant: 25 Apr 2017

Filings by year

E21D 23/087: granted patents and published applications per publication year
Year	Granted patents	Published applications
1977	1	0
1978	4	0
1979	0	0
1980	1	0
1981	0	0
1982	2	0
1983	0	0
1984	0	0
1985	0	0
1986	0	0
1987	0	0
1988	2	0
1989	1	0
1990	0	0
1991	0	0
1992	0	0
1993	0	0
1994	0	0
1995	0	0
1996	0	0
1997	0	0
1998	0	0
1999	0	0
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	0	0
2005	0	0
2006	0	0
2007	0	0
2008	0	0
2009	0	0
2010	0	0
2011	0	0
2012	0	0
2013	0	1
2014	0	0
2015	0	0
2016	0	0
2017	1	0
2018	0	0
2019	0	0
2020	0	0
2021	0	1

By publication year. Applications have been published since 2001.

Subgroups

Granted patents

E21D 23/088By means of wheels, rollers, caterpillars, belts or worm screws12

Recent patents

Most cited

By later US patents