E04F 21/16
Implements for after-treatment of plaster or the like before it has hardened
Official title: Implements for after-treatment of plaster or the like {before it has hardened or dried}, e.g. smoothing-tools, profile trowels {(E04F21/04, E04F21/165 take precedence)}
E04F21/16 (Implements for after-treatment of plaster or the like before it has hardened) appears on 265 US grants and 224 published applications in this corpus.
Search patents in E04F- Granted patents
- 265
- Published applications
- 224
- Assignees
- 93
- Inventors
- 406
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 4 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 4 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 4 | 0 |
| 1994 | 5 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 4 | 0 |
| 1998 | 8 | 0 |
| 1999 | 3 | 0 |
| 2000 | 6 | 0 |
| 2001 | 8 | 2 |
| 2002 | 3 | 6 |
| 2003 | 9 | 3 |
| 2004 | 5 | 3 |
| 2005 | 1 | 12 |
| 2006 | 5 | 13 |
| 2007 | 3 | 10 |
| 2008 | 6 | 10 |
| 2009 | 7 | 10 |
| 2010 | 9 | 6 |
| 2011 | 4 | 5 |
| 2012 | 9 | 8 |
| 2013 | 9 | 4 |
| 2014 | 6 | 7 |
| 2015 | 6 | 10 |
| 2016 | 12 | 10 |
| 2017 | 9 | 7 |
| 2018 | 13 | 15 |
| 2019 | 8 | 12 |
| 2020 | 19 | 12 |
| 2021 | 9 | 9 |
| 2022 | 8 | 12 |
| 2023 | 7 | 12 |
| 2024 | 11 | 13 |
| 2025 | 6 | 8 |
| 2026 | 7 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Knee-guard kneeling board for concrete leveling6 Oct 2026US 12,753,614 B1
- Container with interchangeable liner1 Sep 2026US 12,723,413 B2
- Adjustable notched trowel1 Sep 2026US 12,723,414 B2
- Hand trowel and hand trowel handle for use with the same14 Jul 2026US 12,680,319 B2Acufloor, LLC
- Hand tool with handle7 Jul 2026US 12,674,333 B2Protools Holding B.V.
- Manual concrete finishing tools and components for use therewith23 Jul 2026US 2026/0210133 A1Baron Innovative Technology LP
- Laser welded trowel blade assembly26 Mar 2026US 2026/0085528 A1Multiquip, Inc.
- Wearable grout float12 Mar 2026US 2026/0071447 A1
- Outside corner finishing tool5 Mar 2026US 2026/0062925 A1Ames Tools Corporation
- Adjustable notched trowel12 Feb 2026US 2026/0043255 A1
Most cited
By later US patents
- Hangtag for plaster trowel355US 7,296,772 B22007
- Tools for making impressions in hardenable materials81US 4,131,406 A1978
- Plastic molded trowel handle having fingerguard and palm grip68US 5,446,941 AMarshalltown Trowel Company · 1995
- Drywall taping and texture system using bladder pump with pneumatic flip/flop logic remote control57US 6,712,238 B1Spraytex, Inc. · 2004
- Ergonomic tool handle42US 5,850,663 AHyde Manufacturing Company · 1998