B29L 2031/7742
Helical springs
Official title: {helical springs}
B29L2031/7742 (Helical springs) appears on 42 US grants and 36 published applications in this corpus.
Search patents in B29L- Granted patents
- 42
- Published applications
- 36
- Assignees
- 39
- Inventors
- 92
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 3 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 4 |
| 2009 | 0 | 1 |
| 2010 | 2 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 1 |
| 2014 | 1 | 2 |
| 2015 | 2 | 1 |
| 2016 | 0 | 2 |
| 2017 | 1 | 4 |
| 2018 | 1 | 2 |
| 2019 | 3 | 2 |
| 2020 | 2 | 0 |
| 2021 | 2 | 5 |
| 2022 | 2 | 2 |
| 2023 | 2 | 1 |
| 2024 | 1 | 2 |
| 2025 | 2 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Welding apparatus for strings of springs12 May 2026US 12,622,530 B2L&P Property Management Company
- Sectioned pocketed spring assembly11 Mar 2025US 12,245,701 B2L&P Property Management Company
- Methods and apparatus for a 3D-printed spring18 Feb 2025US 12,228,188 B2Moffitt, LLC
- Permanent tooling for composite coil spring compression molding23 Jul 2024US 12,042,978 B2Ford Global Technologies, LLC
- Roller casting method and system for producing a spiral structure19 Dec 2023US 11,845,124 B2Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V.
- Fiber winding device15 Aug 2024US 2024/0269940 A1Korea Aerospace Research Institute
- Welding Apparatus for Strings of Springs27 Jun 2024US 2024/0206636 A1L&P Property Management Company
- Permanent tooling for composite coil spring compression molding13 Apr 2023US 2023/0109774 A1Ford Global Technologies, LLC
- Methods and apparatus for a 3d-printed spring17 Nov 2022US 2022/0364621 A1Moffitt, LLC
- Permanent tooling for composite coil spring compression molding21 Jul 2022US 2022/0227038 A1Ford Global Technologies, LLC
Most cited
By later US patents
- Carbon fiber reinforced composite coil spring68US 4,260,143 ACelanese Corporation · 1981
- Method for production of a helical spring from a fiber-reinforced plastic65US 4,434,121 AAudi NSU Auto Union Aktiengesellschaft · 1984
- Compression spring with cone shaped frustums subject to compression set53US 5,326,083 AMiner Enterprises, Inc. · 1994
- Process for forming improved carbon fiber reinforced composite coil spring47US 4,380,483 ACelanese Corporation · 1983
- Method and apparatus for the manufacture of pocketed springs42US 6,260,331 B1Sidhil Technology, LLC · 2001