H01H 35/18
Switches operated by change of liquid level or of liquid density
Official title: Switches operated by change of liquid level or of liquid density, e.g. float switch (by magnet carried on a float H01H36/02)
H01H35/18 (Switches operated by change of liquid level or of liquid density) appears on 212 US grants and 118 published applications in this corpus.
Search patents in H01H- Granted patents
- 212
- Published applications
- 118
- Assignees
- 126
- Inventors
- 332
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 7 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 3 | 0 |
| 1982 | 5 | 0 |
| 1983 | 5 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 6 | 0 |
| 1989 | 2 | 0 |
| 1990 | 6 | 0 |
| 1991 | 5 | 0 |
| 1992 | 6 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 4 | 0 |
| 1997 | 1 | 0 |
| 1998 | 5 | 0 |
| 1999 | 3 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 1 |
| 2002 | 8 | 5 |
| 2003 | 4 | 3 |
| 2004 | 5 | 2 |
| 2005 | 2 | 5 |
| 2006 | 7 | 3 |
| 2007 | 2 | 8 |
| 2008 | 5 | 2 |
| 2009 | 6 | 3 |
| 2010 | 2 | 8 |
| 2011 | 5 | 2 |
| 2012 | 3 | 1 |
| 2013 | 1 | 4 |
| 2014 | 2 | 6 |
| 2015 | 5 | 6 |
| 2016 | 4 | 4 |
| 2017 | 5 | 7 |
| 2018 | 4 | 10 |
| 2019 | 5 | 15 |
| 2020 | 18 | 2 |
| 2021 | 5 | 5 |
| 2022 | 2 | 2 |
| 2023 | 2 | 3 |
| 2024 | 3 | 5 |
| 2025 | 4 | 4 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Auto detaching connector for electronic devices24 Mar 2026US 12,586,954 B2Google Inc.
- Spring actuated float switch20 Jan 2026US 12,531,196 B2Alderon Industries, LLC
- Enhanced dual float switch with illumination and switch discrimination28 Oct 2025US 12,454,955 B1Glentronics, Inc.
- Drain cleaner apparatus26 Aug 2025US 12,397,329 B2Iflo LLC
- Modulating makeup fluid control systems and methods for same8 Jul 2025US 12,352,465 B2Pure Humidifier Co.
- Reed switch unit16 Jul 2026US 2026/0204501 A1Sumitomo Wiring Systems, Ltd.
- Modulating makeup fluid control systems and methods for same22 Jan 2026US 2026/0022847 A1Pure Humidifier Co.
- Drain cleaner apparatus27 Nov 2025US 2025/0360543 A1Iflo LLC
- Method of manufacturing float switch31 Jul 2025US 2025/0246379 A1Alderon Industries, LLC
- Flush switch for aircraft lavatory unit10 Jul 2025US 2025/0223039 A1The Yokohama Rubber Co., Ltd.
Most cited
By later US patents
- Liquid shut-off system112US 4,904,830 A1990
- Overflow control system82US 4,418,712 A1983
- Refrigerant loss detector and alarm66US 5,228,304 A1993
- Refrigerant quantity detecting device for air conditioning of vehicles61US 4,308,725 ADiesel Kiki Co., Ltd. · 1982
- Fluid level sensing and control system61US 6,595,051 B1Chandler Systems, Inc. · 2003