F04C 2230/41
Hardening
Official title: Hardening; Annealing
F04C2230/41 (Hardening) appears on 20 US grants and 22 published applications in this corpus.
Search patents in F04C- Granted patents
- 20
- Published applications
- 22
- Assignees
- 25
- Inventors
- 72
- Latest grant
- 26 Mar 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 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 | 2 |
| 2011 | 1 | 1 |
| 2012 | 1 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 1 | 3 |
| 2018 | 0 | 2 |
| 2019 | 3 | 2 |
| 2020 | 1 | 1 |
| 2021 | 2 | 1 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- 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
- Scroll compressor with coated sliding surface14 Jul 2020US 10,711,783 B2Liebherr-Aerospace Toulouse SAS
- Scroll compressor3 Dec 2019US 10,495,088 B2LG Electronics 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.
- Scroll compressor including a fixed and orbiting scroll20 May 2021US 2021/0148361 A1Mitsubishi Heavy Industries Thermal Systems, Ltd.
- Lightweight vacuum pump with oxidized surfaces12 Mar 2020US 2020/0080561 A1Fieldpiece Instruments, Inc.
- Automotive auxiliary assembly vacuum pump having a single-piece flange element7 Nov 2019US 2019/0338642 A1Pierburg Pump Technology GmbH
Most cited
By later US patents
- 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
- Vane type compressor having an improved rotatable sleeve12US 4,616,985 AMazda Motor Corporation · 1986
- Variable scroll tip hardness8US 5,388,973 ATecumseh Products Company · 1995