A47C 7/28
With tensioned springs
Official title: with tensioned springs, e.g. of flat type
A47C7/28 (With tensioned springs) appears on 482 US grants and 492 published applications in this corpus.
Search patents in A47C- Granted patents
- 482
- Published applications
- 492
- Assignees
- 225
- Inventors
- 763
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 4 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 5 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 7 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 3 | 0 |
| 1998 | 6 | 0 |
| 1999 | 1 | 0 |
| 2000 | 10 | 0 |
| 2001 | 7 | 7 |
| 2002 | 10 | 24 |
| 2003 | 16 | 29 |
| 2004 | 22 | 21 |
| 2005 | 17 | 25 |
| 2006 | 16 | 24 |
| 2007 | 11 | 26 |
| 2008 | 24 | 15 |
| 2009 | 14 | 22 |
| 2010 | 14 | 27 |
| 2011 | 9 | 8 |
| 2012 | 13 | 12 |
| 2013 | 12 | 11 |
| 2014 | 5 | 17 |
| 2015 | 19 | 17 |
| 2016 | 17 | 14 |
| 2017 | 14 | 16 |
| 2018 | 14 | 16 |
| 2019 | 19 | 16 |
| 2020 | 17 | 23 |
| 2021 | 19 | 32 |
| 2022 | 27 | 28 |
| 2023 | 22 | 14 |
| 2024 | 22 | 27 |
| 2025 | 13 | 20 |
| 2026 | 14 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Apparatus and method for manufacturing a support frame for a seat assembly1 Sep 2026US 12,721,443 B2Illinois Tool Works Inc.
- Sitting or lying furniture18 Aug 2026US 12,708,210 B2Krall + Roth Services GmbH & Co. KG
- Chair18 Aug 2026US 12,708,213 B2Okamura Corporation
- Seat7 Jul 2026US 12,672,721 B2P.R. Sella B.V.
- Chair and frame assembly thereof9 Jun 2026US 12,648,648 B2
- Modular seating assembly18 Jun 2026US 2026/0165482 A1The Lovesac Company
- Foldable chair4 Dec 2025US 2025/0366619 A1Shibumi Shade, Inc.
- Chair and frame assembly thereof13 Nov 2025US 2025/0344866 A1
- Chair and frame assembly thereof13 Nov 2025US 2025/0344867 A1
- Seating structure having a natural material integrated with an elastically deformable layer2 Oct 2025US 2025/0302198 A1MillerKnoll, Inc.
Most cited
By later US patents
- Lumbar support for a chair266US 6,572,190 B2HON Technology Inc. · 2003
- Woven fabric membrane for a seating surface256US 6,035,901 AHerman Miller, Inc. · 2000
- Office chair249US 6,059,368 AHerman Miller, Inc. · 2000
- Chair back construction231US 6,729,691 B2HON Technology Inc. · 2004
- Office chair224US 6,386,634 B1Herman Miller, Inc. · 2002