F04C 21/005
The piston oscillating in the space
Official title: {the piston oscillating in the space, e.g. around a fixed point (rotary-piston pumps with non-parallel axes of rotation between co-operating members F04C18/48)}
F04C21/005 (The piston oscillating in the space) appears on 7 US grants and 6 published applications in this corpus.
Search patents in F04C- Granted patents
- 7
- Published applications
- 6
- Assignees
- 5
- Inventors
- 9
- Latest grant
- 9 Aug 2022
Filings by year
| Year | Granted patents | Published applications |
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| 1990 | 1 | 0 |
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| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
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| 2014 | 0 | 1 |
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| 2018 | 0 | 1 |
| 2019 | 1 | 1 |
| 2020 | 1 | 1 |
| 2021 | 0 | 0 |
| 2022 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Rotational displacement apparatus9 Aug 2022US 11,408,286 B2Fetu Limited
- Spherical compressor15 Sep 2020US 10,774,834 B2Shenzhen Zhongke Zheng'an Science & Technology Partnership Enterprise (limited partnership)
- Rotational displacement apparatus15 Oct 2019US 10,443,383 B2Fetu Limited
- Automatic compensation mechanism for hinge seal gap in spherical compressor3 May 2016US 9,328,732 B2Xi'an Zhengan Environmental Technology Co., Ltd.
- Twin-plate rotary compressor1 Jun 2010US 7,726,960 B2Nanyang Technological University
- Rotational Displacement Apparatus30 Jan 2020US 2020/0032652 A1Fetu Limited
- Spherical compressor21 Feb 2019US 2019/0055944 A1Shenzhen Zhongke Zheng'an Science & Technology Partnership Enterprise (limited partnership)
- Rotational Displacement Apparatus15 Feb 2018US 2018/0045052 A1Fetu Limited
- Automatic compensation mechanism for hinge seal gap in spherical compressor12 Jun 2014US 2014/0159313 A1Xi'an Zhengan Environmental Technology Co., Ltd.
- Fluid Impelling Device and Electronic Apparatus12 Jun 2008US 2008/0137288 A1Lenovo (Singapore) Pte. Ltd.
Most cited
By later US patents
- Twin-plate rotary compressor6US 7,726,960 B2Nanyang Technological University · 2010
- Waveform actuating air compressor4US 4,919,601 A1990
- Rotational displacement apparatus3US 10,443,383 B2Fetu Limited · 2019
- Fluid impelling device and electronic apparatus2US 7,457,115 B2Lenovo (Singapore) Pte. Ltd. · 2008