G01L 13/04
Devices or apparatus for measuring differences of two or more fluid pressure
Official title: using floats or liquids as sensing elements
G01L13/04 (Devices or apparatus for measuring differences of two or more fluid pressure) appears on 19 US grants and 18 published applications in this corpus.
Search patents in G01L- Granted patents
- 19
- Published applications
- 18
- Assignees
- 12
- Inventors
- 30
- Latest grant
- 9 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 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 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 2 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 1 | 0 |
| 2020 | 1 | 2 |
| 2021 | 1 | 2 |
| 2022 | 3 | 2 |
| 2023 | 2 | 2 |
| 2024 | 1 | 1 |
| 2025 | 2 | 5 |
By publication year. Applications have been published since 2001.
Recent patents
- Interchangeable directional differential pressure detector9 Sep 2025US 12,411,053 B2AirFlow Direction, Inc.
- Directional differential pressure detector27 May 2025US 12,313,484 B2AirFlow Direction, Inc.
- Directional differential pressure detector31 Dec 2024US 12,181,354 B2AirFlow Direction, Inc.
- Directional differential pressure detector22 Aug 2023US 11,733,116 B2AirFlow Direction, Inc.
- Directional differential pressure detector9 May 2023US 11,644,376 B2AirFlow Direction, Inc.
- Interchangeable directional differential pressure detector27 Nov 2025US 2025/0362195 A1AirFlow Direction, Inc.
- Variably choked pressure rate-of-rise mass flow verifier23 Oct 2025US 2025/0327695 A1APPLIED Materials.Inc.
- Directional differential pressure detector7 Aug 2025US 2025/0251293 A1AirFlow Direction, Inc.
- Differential oil-filled pressure transducers with compensating capsule15 May 2025US 2025/0155307 A1Kulite Semiconductor Products, Inc.
- Directional differential pressure detector27 Feb 2025US 2025/0067611 A1AirFlow Direction, Inc.
Most cited
By later US patents
- Capacitive pressure sensor with moving or shape-changing dielectric52US 6,122,972 AVeris Industries, LLC · 2000
- Directional differential pressure detector having an adjustable pivot arm14US 10,690,560 B22020
- Control for sample volume metering apparatus10US 4,461,181 ABecton, Dickinson and Company · 1984
- Directional differential pressure detector with improved reliability7US 11,415,475 B2AirFlow Direction, Inc. · 2022
- Directional differential pressure detector having an inclined conduit and a pitch indicator7US 11,415,477 B2AirFlow Direction, Inc. · 2022