F04C 15/0046
Internal leakage control
Official title: {Internal leakage control}
F04C15/0046 (Internal leakage control) appears on 43 US grants and 35 published applications in this corpus.
Search patents in F04C- Granted patents
- 43
- Published applications
- 35
- Assignees
- 42
- Inventors
- 87
- Latest grant
- 20 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 4 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 2 |
| 2004 | 2 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 1 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 0 | 2 |
| 2015 | 0 | 2 |
| 2016 | 1 | 2 |
| 2017 | 2 | 3 |
| 2018 | 2 | 0 |
| 2019 | 1 | 2 |
| 2020 | 1 | 6 |
| 2021 | 5 | 3 |
| 2022 | 4 | 3 |
| 2023 | 3 | 4 |
| 2024 | 3 | 1 |
| 2025 | 2 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for ascertaining leaks of a displacement pump20 Jan 2026US 12,529,371 B2Brinkmann Pumpen K. H. Brinkmann GmbH & Co. KG
- Uniaxial eccentric screw pump with radial adjustment of the stator15 Apr 2025US 12,276,280 B2HEISHIN Ltd.
- Eccentric screw pump with a pressure chamber between an elastomeric stator portion and a casing4 Feb 2025US 12,215,689 B2Grundfos Holding A/S
- Hydraulic machine24 Dec 2024US 12,173,706 B2White Drive Motors and Steering Sp. Z.O.O.
- Screw pump or machine with a liner that bends and/or pivots with the rotors18 Jun 2024US 12,012,957 B2Circor Pumps North America, LLC
- Stator lining, stator and method for producing a stator lining30 Apr 2026US 2026/0121461 A1
- Uniaxial eccentric screw pump18 Apr 2024US 2024/0125321 A1HEISHIN Ltd.
- Method for Ascertaining Leaks of a Displacement Pump23 Nov 2023US 2023/0374987 A1Brinkmann Pumpen K. H. Brinkmann GmbH & Co. KG
- Hydraulic machine5 Oct 2023US 2023/0313818 A1White Drive Motors and Steering Sp. Z.O.O.
- Internal gear machine22 Jun 2023US 2023/0193899 A1Hydraulik Nord Technologies GmbH
Most cited
By later US patents
- Device having a sealed control opening and an orbiting valve15US 4,877,383 A1989
- Motor-pump unit13US 10,060,432 B2Eckerle Industrie-Elektronik GmbH · 2018
- Gerotor motor and case drain flow arrangement therefor8US 4,480,972 AEaton Corporation · 1984
- Drain for internal gear hydraulic device8US 4,881,880 AParker-Hannifin Corporation · 1989
- Gear pump8US 5,253,988 AMaag Pump Systems AG · 1993