F04C 2230/40
Heat treatment
F04C2230/40 (Heat treatment) appears on 29 US grants and 31 published applications in this corpus.
Search patents in F04C- Granted patents
- 29
- Published applications
- 31
- Assignees
- 31
- Inventors
- 108
- Latest grant
- 5 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 1 | 1 |
| 2006 | 0 | 2 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 1 |
| 2010 | 1 | 3 |
| 2011 | 1 | 1 |
| 2012 | 1 | 1 |
| 2013 | 1 | 1 |
| 2014 | 1 | 1 |
| 2015 | 1 | 1 |
| 2016 | 0 | 0 |
| 2017 | 1 | 3 |
| 2018 | 1 | 3 |
| 2019 | 3 | 3 |
| 2020 | 2 | 1 |
| 2021 | 2 | 3 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 1 | 0 |
| 2025 | 2 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Stator compound having an azide cured elastomeric base and stators and downhole motors using the same5 Aug 2025US 12,378,371 B2PV Fluid Products, Inc.
- Undercured stator for mud motor18 Mar 2025US 12,252,969 B2Schlumberger Technology Corporation
- Scroll compressor including fixed and orbiting scroll having stepped portions and a surface hardened treatment26 Mar 2024US 11,939,977 B2Mitsubishi Heavy Industries Thermal Systems, Ltd.
- Scroll compressor including fixed and orbiting scrolls having different heights and surface hardenings17 Aug 2021US 11,092,155 B2Mitsubishi Heavy Industries Thermal Systems, Ltd.
- Automotive auxiliary assembly vacuum pump having a single-piece flange element3 Aug 2021US 11,078,912 B2Pierburg Pump Technology GmbH
- Eccentric screw pump9 Apr 2026US 2026/0098535 A1NETZSCH Pumpen & Systeme GmbH
- Stator compound having an azide cured elastomeric base and stators and downhole motors using the same2 Oct 2025US 2025/0304752 A1PV Fluid Products, Inc.
- Dry vacuum pump and manufacturing method12 Oct 2023US 2023/0323878 A1Pfeiffer Vacuum GmbH
- Compressor including laser-hardened bearing surfaces31 Mar 2022US 2022/0099091 A1Trane International Inc.
- Undercured stator for mud motor24 Jun 2021US 2021/0189848 A1Schlumberger Technology Corporation
Most cited
By later US patents
- Screw-type rotary fluid machine including rotors having treated surfaces20US 5,314,321 AHitachi, Ltd. · 1994
- Sealed type compressor and refrigerating cycle18US 5,548,973 AKabushiki Kaisha Toshiba · 1996
- Hydraulic circuit having a rotary type pump and brake apparatus for a vehicle provided with the same18US 6,474,751 B1Denso Corporation · 2002
- Rotary type fluid compressor15US 4,618,317 ANippon Piston Ring Co., Ltd. · 1986
- Method of treating surfaces of rotors of the screw type rotary machine15US 5,223,052 AHitachi, Ltd. · 1993