F01D 1/36
Using fluid friction
Official title: using fluid friction
F01D1/36 (Using fluid friction) appears on 105 US grants and 86 published applications in this corpus.
Search patents in F01D- Granted patents
- 105
- Published applications
- 86
- Assignees
- 46
- Inventors
- 147
- Latest grant
- 3 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 6 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 5 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 8 | 2 |
| 2002 | 4 | 4 |
| 2003 | 2 | 4 |
| 2004 | 4 | 2 |
| 2005 | 4 | 9 |
| 2006 | 1 | 1 |
| 2007 | 2 | 5 |
| 2008 | 1 | 0 |
| 2009 | 1 | 0 |
| 2010 | 2 | 1 |
| 2011 | 0 | 3 |
| 2012 | 0 | 1 |
| 2013 | 0 | 4 |
| 2014 | 3 | 9 |
| 2015 | 2 | 4 |
| 2016 | 5 | 7 |
| 2017 | 3 | 2 |
| 2018 | 2 | 5 |
| 2019 | 3 | 3 |
| 2020 | 4 | 4 |
| 2021 | 4 | 5 |
| 2022 | 7 | 1 |
| 2023 | 3 | 4 |
| 2024 | 3 | 2 |
| 2025 | 4 | 3 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Double-suction split case multi-disc pump3 Feb 2026US 12,540,622 B1
- Boundary-layer turbomachine2 Dec 2025US 12,486,772 B2
- Engine1 Jul 2025US 12,345,202 B2Tree Associates Ltd.
- Modular valvular conduit upwelling system1 Jul 2025US 12,345,227 B1
- Apparatus and method for converting thermal energy11 Feb 2025US 12,221,907 B2Enerscale GmbH
- System and method for generating power5 Mar 2026US 2026/0063038 A1Boundary Energy Inc.
- Turbomachine and apparatus comprising said turbomachine26 Jun 2025US 2025/0207605 A1Sf Energy Srl
- Ultra-efficient bladeless turbomachinery5 Jun 2025US 2025/0179919 A1
- Engine9 Jan 2025US 2025/0012219 A1Tree Associates Ltd.
- Apparatus and method for converting thermal energy16 May 2024US 2024/0159169 A1Enerscale GmbH
Most cited
By later US patents
- Viscous drag impeller components incorporated into pumps, turbines and transmissions164US 6,375,412 B12002
- Prandtl layer turbine92US 6,328,527 B1Fantom Technologies Inc. · 2001
- Turbines and methods of generating power58US 7,341,424 B2Dial Discoveries, LLC · 2008
- Prandtl layer turbine57US 6,183,641 B2Fantom Technologies Inc. · 2001
- Rotor assembly for disc turbine56US 6,692,232 B12004