E04F 2201/0523
Separate tongues
Official title: Separate tongues; Interlocking keys, e.g. joining mouldings of circular, square or rectangular shape
E04F2201/0523 (Separate tongues) appears on 502 US grants and 597 published applications in this corpus.
Search patents in E04F- Granted patents
- 502
- Published applications
- 597
- Assignees
- 112
- Inventors
- 274
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 1 | 5 |
| 2003 | 4 | 10 |
| 2004 | 6 | 9 |
| 2005 | 5 | 6 |
| 2006 | 2 | 7 |
| 2007 | 3 | 10 |
| 2008 | 8 | 22 |
| 2009 | 7 | 15 |
| 2010 | 10 | 14 |
| 2011 | 17 | 23 |
| 2012 | 13 | 25 |
| 2013 | 23 | 29 |
| 2014 | 29 | 43 |
| 2015 | 33 | 34 |
| 2016 | 43 | 39 |
| 2017 | 28 | 24 |
| 2018 | 24 | 24 |
| 2019 | 30 | 29 |
| 2020 | 31 | 33 |
| 2021 | 34 | 45 |
| 2022 | 29 | 25 |
| 2023 | 27 | 35 |
| 2024 | 26 | 41 |
| 2025 | 45 | 31 |
| 2026 | 14 | 18 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- E04F 2201/0547Adapted to be moved perpendicular to the joint edgeIndexing code160
- E04F 2201/0535Adapted for snap lockingIndexing code143
- E04F 2201/0552Adapted to be rotated around an axis parallel to the joint edgeIndexing code104
- E04F 2201/0564Depending on the use of specific materialsIndexing code86
- E04F 2201/0529The interlocking key acting as a dovetail-type keyIndexing code57
- E04F 2201/0541Adapted to be moved along the joint edgeIndexing code34
- E04F 2201/0558Adapted to be rotated around an axis perpendicular to the joint edgeIndexing code7
Recent patents
- Set consisting of two panels for cladding a surface and of a panel connection element, panel connection element, and use of a panel connection element15 Sep 2026US 12,735,897 B2Surface Technologies GmbH & Co. KG
- Portion of a flexible tongue25 Aug 2026US D1,143,920 S1Välinge Innovation AB · Design
- Building panel with a mechanical locking system18 Aug 2026US 12,709,901 B2Välinge Innovation AB
- Panel for forming a covering11 Aug 2026US 12,703,984 B2Unilin BV
- Fastener positioning device4 Aug 2026US D1,138,705 S1National Nail Corp. · Design
- Floor panel8 Oct 2026US 2026/0308921 A1Unilin BV
- A joint for wall panels made of cross laminated timber6 Aug 2026US 2026/0226733 A1Clt Factory, Sia
- Drop deck flooring panel30 Jul 2026US 2026/0218522 A1Sur-Loc Holdings, LLC
- Floor panel and methods for manufacturing floor panels9 Jul 2026US 2026/0193891 A1Aladdin Manufacturing Corporation
- Fully assembled storage room18 Jun 2026US 2026/0168233 A1Zhejiang Shedex Industrial and Trading Co., Ltd.
Most cited
By later US patents
- Panel for a composite surface and a method of assembling same631US 4,426,820 A1984
- Flooring material, comprising board shaped floor elements which are intended to be joined vertically469US 6,647,690 B1Pergo (Europe) AB · 2003
- Artificial skating-rink floor456US 4,169,688 A1979
- Thermoplastic planks and methods for making the same450US 6,617,009 B1Mannington Mills, Inc. · 2003
- Flooring material434US 6,591,568 B1Pergo (Europe) AB · 2003