E04F 21/241
Elongated smoothing blades or plates
Official title: {Elongated smoothing blades or plates, e.g. screed apparatus}
E04F21/241 (Elongated smoothing blades or plates) appears on 230 US grants and 194 published applications in this corpus.
Search patents in E04F- Granted patents
- 230
- Published applications
- 194
- Assignees
- 89
- Inventors
- 310
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 6 | 0 |
| 1989 | 9 | 0 |
| 1990 | 5 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 4 | 0 |
| 1996 | 1 | 0 |
| 1997 | 6 | 0 |
| 1998 | 7 | 0 |
| 1999 | 4 | 0 |
| 2000 | 6 | 0 |
| 2001 | 5 | 2 |
| 2002 | 6 | 7 |
| 2003 | 5 | 5 |
| 2004 | 9 | 5 |
| 2005 | 5 | 9 |
| 2006 | 7 | 9 |
| 2007 | 8 | 11 |
| 2008 | 4 | 4 |
| 2009 | 9 | 5 |
| 2010 | 4 | 7 |
| 2011 | 2 | 6 |
| 2012 | 3 | 3 |
| 2013 | 2 | 3 |
| 2014 | 3 | 2 |
| 2015 | 6 | 7 |
| 2016 | 6 | 6 |
| 2017 | 10 | 6 |
| 2018 | 4 | 14 |
| 2019 | 14 | 7 |
| 2020 | 7 | 10 |
| 2021 | 6 | 10 |
| 2022 | 5 | 10 |
| 2023 | 8 | 18 |
| 2024 | 6 | 12 |
| 2025 | 8 | 8 |
| 2026 | 9 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Attachment for screeding concrete15 Sep 2026US 12,735,904 B2Meinders Concrete Construction, Inc.
- Electronically actuated leveling system for screeding concrete14 Jul 2026US 12,680,240 B2Ligchine International Corporation
- Concrete screed device with oscillating screed bar23 Jun 2026US 12,662,826 B2Bad Ass Tools LLC
- Grooved surface concrete float16 Jun 2026US 12,655,645 B2Kraft Tool Company
- Hand tool2 Jun 2026US 12,644,237 B2Easy Slabber Holdings Limited
- Concrete forming tool24 Sep 2026US 2026/0286721 A1Bull Force Concrete Products LLC
- Vibrating power tool and components thereof3 Sep 2026US 2026/0258613 A1
- Manual concrete finishing tools and components for use therewith23 Jul 2026US 2026/0210133 A1Baron Innovative Technology LP
- Drive-in boom screed23 Jul 2026US 2026/0210135 A1Ligchine International Corporation
- Concrete screeding machine with elevation control over contoured support surface18 Jun 2026US 2026/0168265 A1Somero Enterprises, Inc.
Most cited
By later US patents
- Apparatus for screening and trowelling concrete75US 5,039,249 A1991
- Apparatus and method for controlling laser guided machines73US 4,978,246 A1990
- Apparatus for screeding uncured concrete surfaces71US 7,121,762 B2Somero Enterprises, Inc. · 2006
- Concrete leveling machine61US 5,129,803 AShimizu Construction Co., Ltd. · 1992
- Transformable two-person floating screed with automatic grade control56US 6,089,787 AAllen Engineering Corporation · 2000