E04G 21/3238
Using counterweights
Official title: {using counterweights}
E04G21/3238 (Using counterweights) appears on 49 US grants and 56 published applications in this corpus.
Search patents in E04G- Granted patents
- 49
- Published applications
- 56
- Assignees
- 31
- Inventors
- 86
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 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 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 3 |
| 2002 | 1 | 1 |
| 2003 | 2 | 4 |
| 2004 | 0 | 1 |
| 2005 | 5 | 3 |
| 2006 | 2 | 4 |
| 2007 | 0 | 2 |
| 2008 | 1 | 1 |
| 2009 | 3 | 2 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 2 | 0 |
| 2013 | 0 | 4 |
| 2014 | 2 | 4 |
| 2015 | 4 | 5 |
| 2016 | 2 | 0 |
| 2017 | 3 | 3 |
| 2018 | 2 | 1 |
| 2019 | 1 | 1 |
| 2020 | 3 | 2 |
| 2021 | 0 | 0 |
| 2022 | 2 | 4 |
| 2023 | 0 | 2 |
| 2024 | 3 | 1 |
| 2025 | 2 | 2 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Modular free-standing ballasted guardrail system26 May 2026US 12,637,868 B2Sayfa R&D Pty Ltd
- Railing base for a safety railing structure, guardrails23 Dec 2025US 12,503,869 B2Tractel Inc. U.S.A.
- Apparatus for quick-deploy scaffolding4 Nov 2025US 12,460,434 B2
- Fall protection system1 Oct 2024US 12,102,851 B23M Innovative Properties Company
- Safety gate27 Aug 2024US 12,071,777 B2Global Engineers Technology Pte. Ltd.
- Apparatus for quick-deploy scaffolding16 Jul 2026US 2026/0201712 A1
- Apparatus for quick-deploy scaffolding11 Jun 2026US 2026/0160082 A1
- Apparatus for quick-deploy scaffolding5 Mar 2026US 2026/0062931 A1
- Weighted base for a mobile stop device, and mobile stop device1 Jan 2026US 2026/0002372 A1Peri SE
- Weighted base for a mobile stop device, and mobile stop device25 Dec 2025US 2025/0389129 A1Peri SE
Most cited
By later US patents
- Safety device for roof work48US 5,143,170 A1992
- Portable safety rail system40US 5,188,342 ASinco, Inc. · 1993
- Safety rail system37US 6,554,257 B12003
- Support for the handrail of a detachable handrail unit34US 4,909,483 AAlprokon Promotie en Dontwikkeling B.V. · 1990
- Fencing base with ballast weight34US 9,677,299 B2Oxford Plastic Systems Limited · 2017