B21K 1/305
Helical
Official title: {helical}
B21K1/305 (Helical) appears on 52 US grants and 29 published applications in this corpus.
Search patents in B21K- Granted patents
- 52
- Published applications
- 29
- Assignees
- 43
- Inventors
- 107
- Latest grant
- 23 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 5 | 0 |
| 2001 | 4 | 1 |
| 2002 | 2 | 1 |
| 2003 | 0 | 1 |
| 2004 | 2 | 1 |
| 2005 | 0 | 3 |
| 2006 | 1 | 0 |
| 2007 | 0 | 2 |
| 2008 | 2 | 3 |
| 2009 | 1 | 1 |
| 2010 | 2 | 2 |
| 2011 | 0 | 0 |
| 2012 | 3 | 0 |
| 2013 | 1 | 1 |
| 2014 | 1 | 1 |
| 2015 | 1 | 1 |
| 2016 | 1 | 3 |
| 2017 | 1 | 0 |
| 2018 | 0 | 1 |
| 2019 | 1 | 1 |
| 2020 | 0 | 2 |
| 2021 | 1 | 1 |
| 2022 | 3 | 1 |
| 2023 | 1 | 2 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Forming method and forming machine for producing a helical toothing of a cylindrical workpiece by extrusion23 Sep 2025US 12,420,331 B2FELSS Systems GmbH
- Stamping press forming of outer diameter helical splines11 Jul 2023US 11,697,149 B2MAGNA Powertrain AG & Co KG
- Method for the forming manufacturing of a gear toothing and tool device for the calibration of the gear cutting inlet and/or gear cutting outlet30 Aug 2022US 11,426,785 B2ZF Friedrichshafen AG
- Net forged spiral bevel gear3 May 2022US 11,318,569 B2American Axle & Manufacturing, Inc.
- Method and apparatus for forging gear19 Apr 2022US 11,305,334 B2Toyota Jidosha Kabushiki Kaisha
- Forming method and forming machine for producing a helical toothing of a cylindrical workpiece by extrusion14 Dec 2023US 2023/0398598 A1FELSS Systems GmbH
- Gear material, and production method and finishing method therefor27 Jul 2023US 2023/0234121 A1Gohsyu Corporation
- Stamping press forming of outer diameter helical splines27 Oct 2022US 2022/0339692 A1MAGNA Powertrain AG & Co KG
- Net forged spiral bevel gear27 May 2021US 2021/0154778 A1American Axle & Manufacturing, Inc.
- Method for the Forming Manufacturing of a Gear Toothing and Tool Device for the Calibration of the Gear Cutting Inlet and/or Gear Cutting Outlet20 Aug 2020US 2020/0261961 A1ZF Friedrichshafen AG
Most cited
By later US patents
- Flexible shaft and method for manufacturing same91US 5,488,761 A1996
- Powder compacting apparatus and method of forming helical gear wheel using said powder compacting apparatus36US 6,156,265 ASumitomo Electric Industries, Ltd. · 2000
- Compacted-powder opposed twin-helical gears and method17US 6,165,400 AStackpole Limited · 2000
- Method and apparatus for forging bevel gears16US 4,050,283 ABayerisches Leichtmetallwerk Graf Blucher von Wahlstatt KG · 1977
- Method and apparatus for plastically forming helical internal gears and helical gears15US 4,924,690 AHitachi Powdered Metals Co., Ltd. · 1990