Granted patents
543
Published applications
292
Assignees
160
Inventors
860
Latest grant
8 Sep 2026

Filings by year

F16D 55/227: granted patents and published applications per publication year
YearGranted patentsPublished applications
1976130
1977200
1978190
197940
1980150
1981120
1982240
1983120
1984230
1985140
1986130
198790
1988170
1989120
199090
1991110
1992150
199390
199480
199570
1996100
199770
199880
1999150
200090
2001166
2002156
200344
2004411
2005412
200644
2007811
200838
200924
201053
201156
201243
201339
2014316
201575
20161110
201789
20181218
20191218
20201718
20211419
20221329
2023915
20242011
20251322
20261215

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

Recent patents

Most cited

By later US patents