B21K 1/56
Screw-threaded elements
Official title: screw-threaded elements
B21K1/56 (Screw-threaded elements) appears on 133 US grants and 105 published applications in this corpus.
Search patents in B21K- Granted patents
- 133
- Published applications
- 105
- Assignees
- 109
- Inventors
- 243
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 4 | 0 |
| 1998 | 1 | 0 |
| 1999 | 4 | 0 |
| 2000 | 4 | 0 |
| 2001 | 6 | 1 |
| 2002 | 4 | 4 |
| 2003 | 6 | 7 |
| 2004 | 1 | 4 |
| 2005 | 3 | 5 |
| 2006 | 4 | 6 |
| 2007 | 4 | 3 |
| 2008 | 7 | 2 |
| 2009 | 2 | 4 |
| 2010 | 2 | 4 |
| 2011 | 1 | 6 |
| 2012 | 0 | 5 |
| 2013 | 3 | 2 |
| 2014 | 5 | 5 |
| 2015 | 3 | 3 |
| 2016 | 4 | 3 |
| 2017 | 3 | 2 |
| 2018 | 1 | 2 |
| 2019 | 2 | 5 |
| 2020 | 2 | 4 |
| 2021 | 7 | 1 |
| 2022 | 2 | 6 |
| 2023 | 5 | 7 |
| 2024 | 3 | 6 |
| 2025 | 3 | 7 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Screw and a method of manufacturing thereof15 Sep 2026US 12,734,576 B2
- Stick fit fastener recess system24 Feb 2026US 12,560,193 B2Phillips Screw Company
- Manufacturing method of ball screw using rolling machine28 Oct 2025US 12,454,000 B2Hitachi Astemo, Ltd.
- Fastener, driver bit and punch tool15 Apr 2025US 12,276,295 B2Kwantex Research Inc.
- Method and plant for the fast manufacturing of fasteners8 Apr 2025US 12,269,086 B2Poggipolini S.P.A.
- Forming tool, forming tool assembly, forming machine, forming method and computer program for producing a cylindrical workpiece having a helical outer contour by means of swaging16 Jul 2026US 2026/0199959 A1FELSS Systems GmbH
- Method of manufacturing banjo bolt23 Oct 2025US 2025/0326026 A1Matsumoto Heavy Industry Co. Ltd.
- Workpiece processing method, machine tool, and non-transitory computer-readable recording medium25 Sep 2025US 2025/0296176 A1Yamazaki Mazak Corporation
- Method for cleaning the surface of a bar material, cleaning station and screw manufacturing plant with such a cleaning station3 Jul 2025US 2025/0214121 A1SLCR-Lasertechnik GmbH
- Fastener, driver bit and punch tool12 Jun 2025US 2025/0188974 A1Kwantex Research Inc.
Most cited
By later US patents
- Method for producing male conical threads117US 4,689,984 A1987
- Threaded load transferring attachment86US 6,425,829 B1Nitinol Technologies, Inc. · 2002
- Rebar splicing and anchoring37US 4,619,096 ARichmond Screw Anchor Co., Inc. · 1986
- Apparatus and method for cold forming an L-shaped lead alloy battery terminal37US 5,606,887 ATulip Corporation · 1997
- Anti-cross thread fastener with cleaning tip29US 5,419,667 ARing Screw Works · 1995