B21K 1/44
Bolts, studs, or the like
Official title: bolts, studs, or the like (making screw-thread B21K1/56; making U-bolts B21K1/74)
B21K1/44 (Bolts, studs, or the like) appears on 220 US grants and 162 published applications in this corpus.
Search patents in B21K- Granted patents
- 220
- Published applications
- 162
- Assignees
- 151
- Inventors
- 372
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 9 | 0 |
| 1978 | 9 | 0 |
| 1979 | 7 | 0 |
| 1980 | 5 | 0 |
| 1981 | 3 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 4 | 0 |
| 1988 | 0 | 0 |
| 1989 | 5 | 0 |
| 1990 | 6 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 8 | 0 |
| 1997 | 4 | 0 |
| 1998 | 3 | 0 |
| 1999 | 8 | 0 |
| 2000 | 5 | 0 |
| 2001 | 7 | 1 |
| 2002 | 5 | 3 |
| 2003 | 4 | 7 |
| 2004 | 3 | 4 |
| 2005 | 3 | 8 |
| 2006 | 2 | 11 |
| 2007 | 4 | 6 |
| 2008 | 4 | 6 |
| 2009 | 2 | 6 |
| 2010 | 2 | 8 |
| 2011 | 3 | 6 |
| 2012 | 3 | 7 |
| 2013 | 4 | 4 |
| 2014 | 6 | 11 |
| 2015 | 6 | 9 |
| 2016 | 4 | 6 |
| 2017 | 5 | 6 |
| 2018 | 2 | 16 |
| 2019 | 9 | 7 |
| 2020 | 7 | 8 |
| 2021 | 8 | 4 |
| 2022 | 1 | 6 |
| 2023 | 4 | 5 |
| 2024 | 3 | 4 |
| 2025 | 2 | 3 |
| 2026 | 5 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Screw and a method of manufacturing thereof15 Sep 2026US 12,734,576 B2
- Pull stud bolt installation and removal tool and tubular body manufacturing method thereof11 Aug 2026US 12,703,071 B2Protoeng Co., Ltd.
- Two-piece high-strength screw28 Apr 2026US 12,612,936 B2KAMAX Holding GmbH & Co. KG
- Stick fit fastener recess system24 Feb 2026US 12,560,193 B2Phillips Screw Company
- Fastener system with stabilizer ribs and square drive17 Feb 2026US 12,551,992 B2Phillips Screw Company
- Method for production of a stainless high-strength self-drilling screw5 Jun 2025US 2025/0178072 A1SFS Group International AG
- Mold moving device for forged product forming machine27 Feb 2025US 2025/0065395 A1Chun Zu Machinery Industry Co., Ltd.
- Pull stud bolt installation and removal tool and tubular body manufacturing method thereof30 Jan 2025US 2025/0033174 A1Protoeng Co., Ltd.
- Modular forming tool, modular forming tool set, press tool system and method of making modular forming tool25 Jul 2024US 2024/0246136 A1KAMAX Holding GmbH & Co. KG
- Method for forming hitch ball head23 May 2024US 2024/0165694 A1Chuen Chao Enterprises Co., Ltd.
Most cited
By later US patents
- Screw heads216US 4,084,478 APhillips Screw Company · 1978
- Threaded fastener65US 4,812,095 AEmhart Industries, Inc. · 1989
- Spiral drive system for threaded fasteners50US 5,957,645 APhillips Screw Company · 1999
- Apparatus and method for cold forming an L-shaped lead alloy battery terminal37US 5,606,887 ATulip Corporation · 1997
- Driver for threaded fasteners with spiral drive37US 6,367,358 B1Phillips Screw Company · 2002