E04F 21/248
Used by an operator walking behind the trowel, i.e. walk-behind power trowels
Official title: {used by an operator walking behind the trowel, i.e. walk-behind power trowels}
E04F21/248 (Used by an operator walking behind the trowel, i.e. walk-behind power trowels) appears on 109 US grants and 97 published applications in this corpus.
Search patents in E04F- Granted patents
- 109
- Published applications
- 97
- Assignees
- 37
- Inventors
- 156
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 3 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 3 | 2 |
| 2003 | 2 | 1 |
| 2004 | 1 | 3 |
| 2005 | 4 | 9 |
| 2006 | 8 | 4 |
| 2007 | 2 | 1 |
| 2008 | 3 | 6 |
| 2009 | 2 | 5 |
| 2010 | 2 | 1 |
| 2011 | 3 | 3 |
| 2012 | 1 | 1 |
| 2013 | 1 | 0 |
| 2014 | 0 | 1 |
| 2015 | 1 | 1 |
| 2016 | 0 | 1 |
| 2017 | 1 | 3 |
| 2018 | 1 | 4 |
| 2019 | 1 | 4 |
| 2020 | 5 | 7 |
| 2021 | 2 | 6 |
| 2022 | 4 | 9 |
| 2023 | 4 | 10 |
| 2024 | 6 | 7 |
| 2025 | 7 | 3 |
| 2026 | 4 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Battery pack powered trowel including blade pitch and speed control4 Aug 2026US 12,698,636 B2Milwaukee Electric Tool Corporation
- Decorative concrete with uniform surface and method of forming the same14 Apr 2026US 12,601,177 B2Shaw & Sons, Inc.
- Work machine17 Mar 2026US 12,577,743 B2Honda Motor Co., Ltd.
- Work machine10 Feb 2026US 12,546,067 B2Honda Motor Co., Ltd.
- Safety switch for a battery pack powered trowel4 Nov 2025US 12,462,990 B2Milwaukee Electric Tool Corporation
- Concrete trowel17 Sep 2026US 2026/0275733 A1Milwaukee Electric Tool Corporation
- Motorized bump cutter assembly18 Jun 2026US 2026/0168266 A1
- Anti-kickback control for battery pack powered trowels11 Jun 2026US 2026/0160079 A1Milwaukee Electric Tool Corporation
- Trowel assembly16 Apr 2026US 2026/0103903 A1
- Safety switch for a battery pack powered trowel16 Apr 2026US 2026/0106092 A1Milwaukee Electric Tool Corporation
Most cited
By later US patents