F27D 21/04
Arrangement of indicators or alarms
F27D21/04 (Arrangement of indicators or alarms) appears on 65 US grants and 73 published applications in this corpus.
Search patents in F27D- Granted patents
- 65
- Published applications
- 73
- Assignees
- 75
- Inventors
- 200
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 2 | 2 |
| 2004 | 2 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 0 | 2 |
| 2012 | 0 | 2 |
| 2013 | 0 | 3 |
| 2014 | 1 | 2 |
| 2015 | 3 | 9 |
| 2016 | 4 | 3 |
| 2017 | 6 | 4 |
| 2018 | 3 | 4 |
| 2019 | 4 | 7 |
| 2020 | 1 | 6 |
| 2021 | 5 | 7 |
| 2022 | 3 | 6 |
| 2023 | 5 | 0 |
| 2024 | 7 | 7 |
| 2025 | 3 | 3 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Flame analytics system11 Nov 2025US 12,467,692 B2Honeywell International Inc.
- Reflow furnace12 Aug 2025US 12,385,694 B2Illinois Tool Works Inc.
- Method for monitoring the wear of a refractory lining of a blast furnace8 Apr 2025US 12,270,606 B2ArcelorMittal
- Heat treatment method and heat treatment apparatus22 Oct 2024US 12,125,723 B2SCREEN Holdings Co., Ltd.
- Advancing devices and advancing methods for electrode of electronic glass furnace12 Mar 2026US 2026/0075688 A1Caihong Display Devices Co., Ltd.
- Apparatus and Method for Conducting Hot Work23 Oct 2025US 2025/0327622 A1Safezone Safety Systems, LLC
- Rotary Kiln18 Sep 2025US 2025/0290696 A1LG Chem.Ltd.
- Method and system for diagnosing, forecasting accretion in a rotary kiln2 Jan 2025US 2025/0003682 A1Tata Consultancy Services Limited
- System and method for determining whether to clean a reflow oven26 Dec 2024US 2024/0426555 A1Illinois Tool Works Inc.
Most cited
By later US patents
- Method and apparatus for monitoring temperature of blast furnace and temperature control system using temperature monitoring apparatus21US 5,356,220 AKawasaki Steel Corporation · 1994
- Apparatus and method for conducting hot work17US 8,947,249 B1Safezone Safety Systems, LLC · 2015
- Particulates detection in a cooking instrument13US 10,502,430 B1Brava Home, Inc. · 2019
- Apparatus for sensing empty hoppers10US 4,445,628 AKoppers Company, Inc. · 1984
- Hot kiln alignment system9US 5,146,795 A1992