H03K 17/7955
Using phototransistors
Official title: {using phototransistors}
H03K17/7955 (Using phototransistors) appears on 161 US grants and 70 published applications in this corpus.
Search patents in H03K- Granted patents
- 161
- Published applications
- 70
- Assignees
- 127
- Inventors
- 274
- Latest grant
- 16 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 4 | 0 |
| 1979 | 6 | 0 |
| 1980 | 3 | 0 |
| 1981 | 6 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 8 | 0 |
| 1988 | 9 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 6 | 0 |
| 1992 | 3 | 0 |
| 1993 | 4 | 0 |
| 1994 | 1 | 0 |
| 1995 | 5 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 1 |
| 2002 | 5 | 1 |
| 2003 | 2 | 1 |
| 2004 | 1 | 2 |
| 2005 | 1 | 2 |
| 2006 | 3 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 2 |
| 2009 | 1 | 1 |
| 2010 | 3 | 2 |
| 2011 | 1 | 1 |
| 2012 | 0 | 1 |
| 2013 | 1 | 0 |
| 2014 | 3 | 5 |
| 2015 | 2 | 3 |
| 2016 | 3 | 3 |
| 2017 | 6 | 5 |
| 2018 | 4 | 7 |
| 2019 | 7 | 9 |
| 2020 | 7 | 9 |
| 2021 | 7 | 5 |
| 2022 | 5 | 3 |
| 2023 | 4 | 2 |
| 2024 | 2 | 1 |
| 2025 | 4 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- Clamping circuit16 Dec 2025US 12,500,407 B2Industrial Technology Research Institute
- Reset switch power supply on-off control circuit and system14 Oct 2025US 12,445,123 B2Sublue Underwater Ai Co., Ltd.
- Hybrid analog key structure16 Sep 2025US 12,418,289 B1Logitech Europe S. A.
- Battery switch on circuit and lithium battery15 Apr 2025US 12,278,511 B2Pylon Technologies Co., Ltd.
- Phase loss detection device, compressor including the same, and phase loss detection method26 Nov 2024US 12,155,382 B2Danfoss (Tianjin) Ltd.
- Hybrid analog key structure4 Dec 2025US 2025/0370551 A1Logitech Europe S. A.
- Clamping circuit26 Jun 2025US 2025/0210976 A1Industrial Technology Research Institute
- Reset switch power supply on-off control circuit and system19 Dec 2024US 2024/0421814 A1Sublue Underwater Ai Co., Ltd.
- Switching circuit10 Aug 2023US 2023/0253183 A1Reno Technologies, Inc.
- Battery switch on circuit and lithium battery26 Jan 2023US 2023/0025702 A1Pylon Technologies Co., Ltd.
Most cited
By later US patents
- Solar photovoltaic module safety shutdown system143US 8,859,884 B2Helios Focus LLC · 2014
- Electro-optical isolator circuit for line powered modem136US 4,417,099 AUniversal Data Systems, Inc. · 1983
- Bi-directional optical coupler81US 6,556,750 B2Fairchild Semiconductor Corporation · 2003
- High voltage switch with isolated power80US 10,607,814 B2Eagle Harbor Technologies, Inc. · 2020
- Photoelectric cell with stabilised amplification74US 5,994,689 ASchneider Electric SA · 1999