B21F 33/04
Connecting ends of helical springs for mattresses
B21F33/04 (Connecting ends of helical springs for mattresses) appears on 81 US grants and 28 published applications in this corpus.
Search patents in B21F- Granted patents
- 81
- Published applications
- 28
- Assignees
- 29
- Inventors
- 99
- Latest grant
- 10 Dec 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 5 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 4 | 0 |
| 1999 | 6 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 0 |
| 2002 | 5 | 4 |
| 2003 | 1 | 2 |
| 2004 | 4 | 2 |
| 2005 | 2 | 1 |
| 2006 | 1 | 1 |
| 2007 | 1 | 2 |
| 2008 | 0 | 2 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 1 | 1 |
| 2013 | 1 | 0 |
| 2014 | 1 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 2 |
| 2017 | 1 | 1 |
| 2018 | 0 | 2 |
| 2019 | 1 | 1 |
| 2020 | 3 | 2 |
| 2021 | 2 | 0 |
| 2022 | 1 | 2 |
| 2023 | 1 | 0 |
| 2024 | 1 | 1 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for transferring coil springs from a coil winding device to a conveyor belt of a pocketed coil assembly machine10 Dec 2024US 12,162,696 B2Spuhl AG
- Magnetic lift platform for transfer of coil springs21 Nov 2023US 11,820,606 B2Spuhl AG
- Machine and method for assembling a bedding foundation19 Apr 2022US 11,304,535 B2L&P Property Management Company
- System for manufacturing string of pocketed coil springs2 Nov 2021US 11,160,388 B2Ümit Elektronik Makina Sanayi Ve Ticaret A.S.
- System for manufacturing string of pocketed coil springs26 Oct 2021US 11,154,141 B2Ümit Elektronik Makina Sanayi Ve Ticaret A.S.
- Method For Transferring Coil Springs From A Coil Winding Device To A Conveyor Belt Of A Pocketed Coil Assembly Machine13 Feb 2025US 2025/0051103 A1Spuhl AG
- Method For Transferring Coil Springs From A Coil Winding Device To A Conveyor Belt Of A Pocketed Coil Assembly Machine15 Aug 2024US 2024/0270510 A1Spuhl AG
- Method for making a spring core for a mattress or for seating products21 Jul 2022US 2022/0226880 A1NV Bekaert SA
- Magnetic Lift Platform For Transfer Of Coil Springs10 Feb 2022US 2022/0041380 A1Spuhl AG
- System for manufacturing string of pocketed coil springs11 Jun 2020US 2020/0178699 A1Ümit Elektronik Makina Sanayi Ve Ticaret A.S.
Most cited
By later US patents
- Method and apparatus for forming pocketed coil spring mattresses47US 6,159,319 AL&P Property Management Company · 2000
- Spring interior and method of making same31US 6,318,416 B1L&P Property Management Company · 2001
- Innerspring construction with springs having free terminal convolutions28US 5,713,088 AOhio Mattress Company Licensing and Components Group · 1998
- Programmable servo-motor quality controlled continuous multiple coil spring forming method and apparatus26US 5,875,664 AL&P Property Management Company · 1999
- Continuous wire spring mattress or seating product and method of manufacture25US 7,251,847 B2L&P Property Management Company · 2007