B21F 35/04
Making flat springs
Official title: Making flat springs, e.g. sinus springs
B21F35/04 (Making flat springs) appears on 21 US grants and 15 published applications in this corpus.
Search patents in B21F- Granted patents
- 21
- Published applications
- 15
- Assignees
- 14
- Inventors
- 35
- Latest grant
- 27 Sep 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 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 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 4 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 2 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 2 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 1 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 1 |
| 2016 | 0 | 2 |
| 2017 | 2 | 1 |
| 2018 | 1 | 2 |
| 2019 | 1 | 1 |
| 2020 | 1 | 0 |
| 2021 | 2 | 1 |
| 2022 | 1 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Wire forming apparatus for electric machine winding27 Sep 2022US 11,456,652 B2BorgWarner Inc.
- Method and articles for attaching upholstery covers and other flexible material24 Aug 2021US 11,097,640 B2Franklin Products, Inc.
- Wire forming apparatus for electric machine winding23 Mar 2021US 10,958,142 B2BorgWarner Inc.
- Method for producing a flat spiral spring, and bending device for producing same26 May 2020US 10,661,330 B2Adolf Schnorr GmbH + Co. KG
- Feedback-based system for bending wire and forming springs26 Mar 2019US 10,239,111 B2L&P Property Management Company
- Nested crest-to-crest wave spring29 May 2025US 2025/0172184 A1Smalley Steel Ring Company
- Wire Forming Apparatus for Electric Machine Winding24 Jun 2021US 2021/0194339 A1BorgWarner Inc.
- Method for manufacturing a balance spring for a timepiece movement27 Jun 2019US 2019/0196406 A1Nivarox-FAR S. A.
- Wire forming apparatus for electric machine winding18 Oct 2018US 2018/0301964 A1BorgWarner Inc.
- Feedback-based system for bending wire and forming springs14 Jun 2018US 2018/0161849 A1L&P Property Management Company
Most cited
By later US patents
- Printed springs and method of manufacture137US 5,743,428 AVulcan Spring & Mfg. Co. · 1998
- Mattress innerspring structure having coaxial coil units20US 5,803,440 AL&P Property Management Company · 1998
- Method of manufacturing printed springs17US 5,649,363 AVulcan Spring & Mfg. Co. · 1997
- Mattress innerspring structure having coaxial coil units14US 5,509,642 AL&P Property Management Company · 1996
- Balance wheel, balance spring and other components and assemblies for a mechanical oscillator system and methods of manufacture10US 7,726,872 B22010