G01F 1/22
By variable-area meters
Official title: by variable-area meters {, e.g. rotameters}
G01F1/22 (By variable-area meters) appears on 378 US grants and 173 published applications in this corpus.
Search patents in G01F- Granted patents
- 378
- Published applications
- 173
- Assignees
- 235
- Inventors
- 645
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 8 | 0 |
| 1978 | 5 | 0 |
| 1979 | 1 | 0 |
| 1980 | 9 | 0 |
| 1981 | 11 | 0 |
| 1982 | 7 | 0 |
| 1983 | 5 | 0 |
| 1984 | 14 | 0 |
| 1985 | 9 | 0 |
| 1986 | 10 | 0 |
| 1987 | 5 | 0 |
| 1988 | 6 | 0 |
| 1989 | 11 | 0 |
| 1990 | 14 | 0 |
| 1991 | 9 | 0 |
| 1992 | 10 | 0 |
| 1993 | 10 | 0 |
| 1994 | 13 | 0 |
| 1995 | 10 | 0 |
| 1996 | 10 | 0 |
| 1997 | 3 | 0 |
| 1998 | 10 | 0 |
| 1999 | 4 | 0 |
| 2000 | 7 | 0 |
| 2001 | 5 | 1 |
| 2002 | 7 | 8 |
| 2003 | 7 | 7 |
| 2004 | 8 | 7 |
| 2005 | 13 | 9 |
| 2006 | 5 | 7 |
| 2007 | 5 | 11 |
| 2008 | 7 | 7 |
| 2009 | 7 | 3 |
| 2010 | 5 | 7 |
| 2011 | 4 | 10 |
| 2012 | 5 | 1 |
| 2013 | 6 | 3 |
| 2014 | 4 | 5 |
| 2015 | 4 | 8 |
| 2016 | 4 | 5 |
| 2017 | 10 | 9 |
| 2018 | 4 | 12 |
| 2019 | 9 | 10 |
| 2020 | 17 | 13 |
| 2021 | 6 | 8 |
| 2022 | 7 | 7 |
| 2023 | 7 | 6 |
| 2024 | 7 | 5 |
| 2025 | 3 | 2 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Flow meter for dosing pumps14 Jul 2026US 12,680,541 B2Advantage Controls, LLC
- System for measuring flow within a pipeline3 Feb 2026US 12,540,839 B2Saudi Arabian Oil Company
- Compact target flow meter5 Aug 2025US 12,379,235 B2Coroflo Limited
- Apparatus for use in measuring a property of a fluid and method3 Jun 2025US 12,320,685 B2University of Limerick
- Ultrasonic fluid meter incorporating a pressure sensor22 Apr 2025US 12,281,921 B2Sagemcom Energy & Telecom SAS
- Digitalization Support Apparatus for Analog Flow Meter13 Aug 2026US 2026/0235424 A1LG Chem.Ltd.
- Flow meter for dosing pumps16 Apr 2026US 2026/0104044 A1Advantage Controls, LLC
- Compact Target Flow Meter3 Apr 2025US 2025/0109974 A1Coroflo Limited
- Systems and methods for bottle apparatuses, container assemblies, and dispensing apparatuses30 Jan 2025US 2025/0032365 A1Cirkul, Inc.
- System for measuring flow within a pipeline22 Aug 2024US 2024/0280388 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Pump system for negative pressure wound therapy337US 7,857,806 B2Boehringer Technologies, L.P. · 2010
- Therapeutic gas flow meter and monitor138US 5,911,219 A1999
- Variable orifice flow sensing apparatus102US 4,993,269 ABird Products Corporation · 1991
- Variable gas volume flow measuring and control methods and apparatus89US 4,796,651 A1989
- Butterfly valve having a function for measuring a flow rate and method of measuring a flow rate with a butterfly valve87US 4,926,903 ATomoe Technical Research Company · 1990