G05D 23/1902
Characterised by the use of a variable reference value
Official title: {characterised by the use of a variable reference value}
G05D23/1902 (Characterised by the use of a variable reference value) appears on 1,628 US grants and 1,313 published applications in this corpus.
Search patents in G05D- Granted patents
- 1,628
- Published applications
- 1,313
- Assignees
- 599
- Inventors
- 2,718
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 14 | 0 |
| 1977 | 16 | 0 |
| 1978 | 19 | 0 |
| 1979 | 19 | 0 |
| 1980 | 29 | 0 |
| 1981 | 24 | 0 |
| 1982 | 30 | 0 |
| 1983 | 26 | 0 |
| 1984 | 22 | 0 |
| 1985 | 29 | 0 |
| 1986 | 21 | 0 |
| 1987 | 33 | 0 |
| 1988 | 18 | 0 |
| 1989 | 28 | 0 |
| 1990 | 21 | 0 |
| 1991 | 14 | 0 |
| 1992 | 26 | 0 |
| 1993 | 24 | 0 |
| 1994 | 27 | 0 |
| 1995 | 32 | 0 |
| 1996 | 20 | 0 |
| 1997 | 23 | 0 |
| 1998 | 23 | 0 |
| 1999 | 21 | 0 |
| 2000 | 12 | 0 |
| 2001 | 27 | 1 |
| 2002 | 25 | 11 |
| 2003 | 26 | 32 |
| 2004 | 19 | 26 |
| 2005 | 11 | 35 |
| 2006 | 25 | 26 |
| 2007 | 24 | 44 |
| 2008 | 11 | 16 |
| 2009 | 18 | 43 |
| 2010 | 24 | 40 |
| 2011 | 18 | 42 |
| 2012 | 36 | 88 |
| 2013 | 44 | 84 |
| 2014 | 55 | 126 |
| 2015 | 67 | 118 |
| 2016 | 78 | 88 |
| 2017 | 86 | 67 |
| 2018 | 93 | 93 |
| 2019 | 83 | 61 |
| 2020 | 74 | 54 |
| 2021 | 44 | 50 |
| 2022 | 43 | 41 |
| 2023 | 41 | 42 |
| 2024 | 32 | 33 |
| 2025 | 34 | 32 |
| 2026 | 19 | 20 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- System, apparatus and method for automatically associating a thermostat with a location25 Aug 2026US 12,719,714 B2Universal Electronics Inc.
- Wirelessly configuring climate control system controls18 Aug 2026US 12,710,189 B2Copeland Comfort Control LP
- HVAC controller including LEDs for illuminating a display4 Aug 2026US 12,698,915 B2Resideo USA LLC
- Thermostat with integrated particle sensor14 Jul 2026US 12,681,512 B2Particles Plus, Inc.
- System for communication, optimization and demand control for an appliance14 Jul 2026US 12,681,513 B2Resideo USA LLC
- A temperature regulating system with feedback loop for thermal response adaptation1 Oct 2026US 2026/0299626 A1Clim8
- Methods and systems for heating emergency regulation in smart cities based on internet of things large models17 Sep 2026US 2026/0277258 A1Chengdu Qinchuan Iot Technology Co., Ltd.
- Method for operating a heat exchanger unit for changing the physical state of matter of an aqueous formulation27 Aug 2026US 2026/0252129 A1Lonza Ltd.
- Aerosol generation system and heating control method therefor20 Aug 2026US 2026/0240256 A1Shenzhen Huabao Collaborative Innovation Technology Research Institute Co., Ltd.
- Power-to-hydrogen plant, control unit and control method thereof13 Aug 2026US 2026/0234822 A1Hitachi Energy Ltd
Most cited
By later US patents
- Energy management and home automation system750US 5,544,036 A1996
- Energy management and home automation system572US 5,761,083 A1998
- Controller interface with multiple day programming569US 7,114,554 B2Honeywell International Inc. · 2006
- Apparatus and method for wireless control453US 6,622,925 B2Enernet Corporation · 2003
- System and method for energy usage curtailment424US 6,868,293 B1Itron, Inc. · 2005