F04C 2230/92
Surface treatment
F04C2230/92 (Surface treatment) appears on 73 US grants and 69 published applications in this corpus.
Search patents in F04C- Granted patents
- 73
- Published applications
- 69
- Assignees
- 59
- Inventors
- 235
- Latest grant
- 21 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 5 | 0 |
| 1999 | 2 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 1 |
| 2002 | 5 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 1 | 3 |
| 2006 | 0 | 1 |
| 2007 | 1 | 3 |
| 2008 | 1 | 2 |
| 2009 | 0 | 1 |
| 2010 | 1 | 2 |
| 2011 | 1 | 3 |
| 2012 | 1 | 4 |
| 2013 | 1 | 1 |
| 2014 | 3 | 7 |
| 2015 | 5 | 3 |
| 2016 | 3 | 3 |
| 2017 | 3 | 9 |
| 2018 | 1 | 2 |
| 2019 | 5 | 2 |
| 2020 | 5 | 6 |
| 2021 | 5 | 4 |
| 2022 | 0 | 3 |
| 2023 | 5 | 6 |
| 2024 | 6 | 1 |
| 2025 | 3 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Low coefficient of expansion rotors for blowers21 Oct 2025US 12,448,968 B2Industrial Technologies and Services, LLC
- Housing assembly for rotary engine6 May 2025US 12,291,991 B1Pratt & Whitney Canada Corp.
- Housing assembly for rotary engine21 Jan 2025US 12,203,410 B1Pratt & Whitney Canada Corp.
- Low coefficient of expansion rotors for blowers10 Sep 2024US 12,085,078 B2Industrial Technologies and Services, LLC
- Moving part, compressor, and manufacturing method thereof16 Jul 2024US 12,038,005 B2Samsung Electronics Co., Ltd.
- Housing assembly for rotary engine16 Jan 2025US 2025/0020076 A1Pratt & Whitney Canada Corp.
- Low coefficient of expansion rotors for blowers26 Dec 2024US 2024/0426299 A1Industrial Technologies and Services, LLC
- Aluminum alloy for sliding component, and sliding component14 Dec 2023US 2023/0399723 A1Resonac Corporation
- Low coefficient of expansion rotors for blowers16 Nov 2023US 2023/0366399 A1Industrial Technologies and Services, LLC
- Roots pump28 Sep 2023US 2023/0304497 A1Kabushiki Kaisha Toyota Jidoshokki
Most cited
By later US patents
- Rotary compressor having oxidizing and nitriding surface treatment39US 4,944,663 AHitachi, Ltd. · 1990
- Scroll compressor27US 5,829,959 AHitachi, Ltd. · 1998
- Refrigeration apparatus and lubricating oil composition21US 5,806,336 ASanyo Electric Co., Ltd. · 1998
- Scroll compressor20US 6,174,150 B1Hitachi, Ltd. · 2001
- Scroll compressor20US 8,672,646 B2Mitsubishi Electric Corporation · 2014