B21F 27/16
For spring mattresses
Official title: for spring mattresses
B21F27/16 (For spring mattresses) appears on 42 US grants and 31 published applications in this corpus.
Search patents in B21F- Granted patents
- 42
- Published applications
- 31
- Assignees
- 23
- Inventors
- 72
- Latest grant
- 10 Dec 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 3 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 1 |
| 2004 | 2 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 1 | 2 |
| 2008 | 2 | 2 |
| 2009 | 0 | 0 |
| 2010 | 0 | 2 |
| 2011 | 1 | 0 |
| 2012 | 2 | 3 |
| 2013 | 3 | 0 |
| 2014 | 2 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 2 |
| 2017 | 1 | 2 |
| 2018 | 1 | 2 |
| 2019 | 1 | 2 |
| 2020 | 3 | 3 |
| 2021 | 2 | 0 |
| 2022 | 2 | 2 |
| 2023 | 1 | 0 |
| 2024 | 1 | 1 |
| 2025 | 0 | 3 |
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
- Device and method for detecting heating treatment temperatures of double steel wires27 Sep 2022US 11,453,928 B2Guangzhou Lianrou Machinery & Equipment Co., Ltd.
- 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.
- Bed mesh combination device, bed mesh combination method, and bed mesh manufactured using the same17 Jul 2025US 2025/0229321 A1Guangzhou Lianrou Machinery & Equipment Co., Ltd.
- Spring transfer apparatus and method29 May 2025US 2025/0171247 A1Hs Products Ltd
- 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
Most cited
By later US patents
- Multi-stranded coil spring30US 7,168,117 B2Dreamwell, Ltd. · 2007
- Seating spring assembly and method26US 4,415,147 ASimmons Universal Corporation · 1983
- Bedding or seating product made with coil springs having unknotted end turns with bumps23US 7,921,561 B2L&P Property Management Company · 2011
- Bedding or seating product made with coil springs having unknotted end turns22US 7,386,897 B2L&P Property Management Company · 2008
- Method and apparatus for forming a row of spring coils from a continuous length of wire21US 4,112,726 ALeggett & Platt, Incorporated · 1978