F04C 18/0223
With symmetrical double wraps
Official title: {with symmetrical double wraps}
F04C18/0223 (With symmetrical double wraps) appears on 117 US grants and 111 published applications in this corpus.
Search patents in F04C- Granted patents
- 117
- Published applications
- 111
- Assignees
- 53
- Inventors
- 234
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 8 | 0 |
| 2001 | 3 | 3 |
| 2002 | 4 | 6 |
| 2003 | 2 | 1 |
| 2004 | 3 | 1 |
| 2005 | 0 | 2 |
| 2006 | 3 | 7 |
| 2007 | 1 | 5 |
| 2008 | 6 | 3 |
| 2009 | 3 | 3 |
| 2010 | 2 | 5 |
| 2011 | 1 | 6 |
| 2012 | 2 | 2 |
| 2013 | 6 | 2 |
| 2014 | 2 | 4 |
| 2015 | 3 | 9 |
| 2016 | 3 | 11 |
| 2017 | 11 | 6 |
| 2018 | 7 | 7 |
| 2019 | 9 | 12 |
| 2020 | 6 | 2 |
| 2021 | 5 | 4 |
| 2022 | 4 | 2 |
| 2023 | 3 | 0 |
| 2024 | 1 | 1 |
| 2025 | 2 | 3 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Vortex compressor8 Sep 2026US 12,729,684 B2Robert Bosch GmbH
- Floating-type oil-free vacuum scroll compressor23 Dec 2025US 12,504,013 B2Shenyang Canta Medical Tech. Co., Ltd.
- Vacuum pump with movable trapezoidal seal11 Feb 2025US 12,221,961 B2Pfeiffer Vacuum Technology AG
- Dry dual-scroll vacuum pump21 May 2024US 11,988,210 B2Zhejiang University
- Compressor having capacity modulation assembly12 Sep 2023US 11,754,072 B2Copeland Corporation
- Predicting tip seal wear in scroll pump23 Jul 2026US 2026/0210358 A1Agilent Technologies, Inc.
- Determining tip seal maintenance requirement in scroll pump23 Jul 2026US 2026/0210359 A1Agilent Technologies, Inc.
- Energy recovery type scroll compressor and carbon dioxide heat pump system using same4 Jun 2026US 2026/0153085 A1Pureis Technology (Hubei) Co., Ltd
- Scroll pump and scroll pump inlet valve14 May 2026US 2026/0132789 A1
- Liquid cooling of a scroll device with liquid supply through integrated rotary unions23 Oct 2025US 2025/0327451 A1Air Squared, Inc.
Most cited
By later US patents
- Scroll fluid machine having a cooling passage inside the drive shaft57US 5,842,843 AAnest Iwata Corporation · 1998
- Multi-stage scroll compressor57US 6,050,792 AAir Squared, Inc. · 2000
- Scroll compressor having an orbiting scroll with volute wraps on both sides of a plate56US 5,775,893 AHitachi, Ltd. · 1998
- Scroll compressor of two-stage compression type having an improved volumetric efficiency52US 5,304,047 ADaikin Industries, Ltd. · 1994
- Scroll pump with axially spaced pumping chambers in series47US 4,650,405 ANippon Soken, Inc. · 1987