B21F 3/08
To flat spiral
Official title: to flat spiral
B21F3/08 (To flat spiral) appears on 11 US grants and 15 published applications in this corpus.
Search patents in B21F- Granted patents
- 11
- Published applications
- 15
- Assignees
- 14
- Inventors
- 43
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 2 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 1 | 2 |
| 2018 | 0 | 0 |
| 2019 | 1 | 1 |
| 2020 | 1 | 1 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 0 | 2 |
| 2025 | 0 | 3 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Tool moving device and wire forming machine22 Sep 2026US 12,741,310 B2Asahi-Seiki Manufacturing Co., Ltd.
- Pre-tightening disc spring, assembly comprising the pre-tightening disc spring, and method for manufacturing the pre-tightening disc spring6 Jan 2026US 12,516,693 B2AIGI Environmental Inc.
- Method for producing a flat spiral spring, and bending device for producing same26 May 2020US 10,661,330 B2Adolf Schnorr GmbH + Co. KG
- Method for press-rolling a timepiece mainspring29 Oct 2019US 10,456,825 B2Nivarox-FAR S. A.
- Spiral spring manufacturing method10 Oct 2017US 9,782,819 B2Suncall Corporation
- Tool moving device and wire forming machine11 Jun 2026US 2026/0158540 A1Asahi-Seiki Manufacturing Co., Ltd.
- Disc spring manufacturing method, and disc spring21 Aug 2025US 2025/0264142 A1NHK Spring Co., Ltd.
- Device for separating wound in balance springs after an expansion cycle, and method for manufacturing a balance spring comprising a separation step carried out by such a device19 Jun 2025US 2025/0199475 A1Nivarox-FAR S. A.
- Winding overhang machining method, winding overhang structure, and stator assembly9 Jan 2025US 2025/0015683 A1United Automotive Electronic Systems Co., Ltd.
- Pre-tightening disc spring, assembly comprising the pre-tightening disc spring, and method for manufacturing the pre-tighening disc spring23 May 2024US 2024/0167501 A1AIGI Environmental Inc.
Most cited
By later US patents
- Driven mandrel and method42US 4,212,179 AThe Gates Rubber Company · 1980
- Method and apparatus for making elongated flat wire coils24US 4,044,583 AWire Conveyor Belts, Inc. · 1977
- Method of manufacturing a gradient magnetic field coil assembly of an MRI apparatus15US 5,409,558 AKabushiki Kaisha Toshiba · 1995
- Wire feeder driving mechanism for spring manufacturing machine7US 7,134,305 B22006
- High-production method and apparatus for making spiral convolution electrical heating coils2US 4,184,350 ASun Chemical Corporation · 1980