B23B 31/302
Hydraulic equipment
Official title: {Hydraulic equipment, e.g. pistons, valves, rotary joints}
B23B31/302 (Hydraulic equipment) appears on 113 US grants and 67 published applications in this corpus.
Search patents in B23B- Granted patents
- 113
- Published applications
- 67
- Assignees
- 77
- Inventors
- 182
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 6 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 8 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 5 | 1 |
| 2002 | 2 | 3 |
| 2003 | 4 | 0 |
| 2004 | 2 | 3 |
| 2005 | 2 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 4 |
| 2009 | 1 | 3 |
| 2010 | 2 | 4 |
| 2011 | 2 | 1 |
| 2012 | 0 | 2 |
| 2013 | 2 | 1 |
| 2014 | 1 | 0 |
| 2015 | 1 | 4 |
| 2016 | 2 | 1 |
| 2017 | 2 | 2 |
| 2018 | 1 | 4 |
| 2019 | 2 | 3 |
| 2020 | 2 | 2 |
| 2021 | 3 | 5 |
| 2022 | 2 | 4 |
| 2023 | 3 | 4 |
| 2024 | 3 | 7 |
| 2025 | 5 | 6 |
| 2026 | 4 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Clamping device for tool holder1 Sep 2026US 12,722,209 B2AB Sandvik Coromant
- Tool rest and machine tool25 Aug 2026US 12,715,048 B2Dmg Mori Co., Ltd.
- Clamping device for tool holder28 Jul 2026US 12,691,504 B2AB Sandvik Coromant
- Modular hydraulic chuck26 May 2026US 12,636,713 B2Kennametal Inc.
- Utilities supply apparatus for tool holder of machine tool23 Dec 2025US 12,502,741 B2Dn Solutions Co., Ltd.
- Tool holder16 Jul 2026US 2026/0199988 A1PCM Precision Tooling SA
- Hydraulic expansion chuck6 Nov 2025US 2025/0339903 A1Gühring KG
- Expansion dleeve for a hydraulic expansion chuck16 Oct 2025US 2025/0319525 A1Gühring KG
- Utilities supply apparatus for tool holder of machine tool4 Sep 2025US 2025/0276386 A1Dn Solutions Co., Ltd.
- Tool holder and tool holding device29 May 2025US 2025/0170656 A1Nt Tool Corporation
Most cited
By later US patents
- Pressure regulator for hydraulically controlled machine tools47US 4,796,652 AIndex-Werke Komm.-Ges. Hahn & Tessky · 1989
- Chuck with an integrated rotary union for fluid flow45US 5,707,186 AGAT Gesellschaft fur Antriebstechnik mbH · 1998
- Quick acting clamping device27US 3,940,122 AAmsted-Siemagkette GmbH · 1976
- Rotating union with carbon graphite labyrinthine seal27US 4,928,997 ADeublin Company · 1990
- Power-operated chuck for turning machines24US 4,508,357 APaul Forkardt GmbH & Co. KG · 1985