F04D 19/044
Holweck-type pumps
Official title: {Holweck-type pumps}
F04D19/044 (Holweck-type pumps) appears on 141 US grants and 123 published applications in this corpus.
Search patents in F04D- Granted patents
- 141
- Published applications
- 123
- Assignees
- 45
- Inventors
- 159
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 4 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 4 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 5 | 1 |
| 2002 | 6 | 7 |
| 2003 | 5 | 5 |
| 2004 | 4 | 3 |
| 2005 | 2 | 2 |
| 2006 | 2 | 1 |
| 2007 | 1 | 4 |
| 2008 | 1 | 6 |
| 2009 | 1 | 1 |
| 2010 | 0 | 1 |
| 2011 | 1 | 2 |
| 2012 | 3 | 1 |
| 2013 | 2 | 9 |
| 2014 | 5 | 6 |
| 2015 | 1 | 14 |
| 2016 | 7 | 6 |
| 2017 | 9 | 2 |
| 2018 | 5 | 6 |
| 2019 | 8 | 4 |
| 2020 | 8 | 8 |
| 2021 | 7 | 4 |
| 2022 | 3 | 18 |
| 2023 | 7 | 3 |
| 2024 | 12 | 4 |
| 2025 | 6 | 4 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Vacuum pump28 Apr 2026US 12,612,918 B2Shimadzu Corporation
- Vacuum pump, rotating body for vacuum pump, and balance correcting member for vacuum pump6 Jan 2026US 12,516,682 B2Edwards Japan Limited
- Turbomolecular vacuum pump and associated method9 Sep 2025US 12,410,805 B2Pfeiffer Vacuum GmbH
- Vacuum pump5 Aug 2025US 12,378,967 B2Edwards Japan Limited
- Multi-stage turbomolecular pump29 Apr 2025US 12,286,974 B2Edwards Limited
- Pump system with electrically operated cooling device23 Jul 2026US 2026/0210364 A1Pfeiffer Vacuum Technology AG
- Vacuum pump and vacuum evacuation system20 Nov 2025US 2025/0354560 A1Edwards Japan Limited
- Vacuum pump11 Sep 2025US 2025/0283473 A1Shimadzu Corporation
- Vacuum pump, rotating body for vacuum pump, and balance correcting member for vacuum pump3 Jul 2025US 2025/0215900 A1Edwards Japan Limited
- Turbomolecular vacuum pump and associated method22 May 2025US 2025/0163924 A1Pfeiffer Vacuum GmbH
Most cited
By later US patents
- Gas friction pump64US 5,893,702 APfeiffer Vacuum GmbH · 1999
- Flywheel system with parallel pumping arrangement41US 6,347,925 B1Beacon Power Corporation · 2002
- Turbomolecular pump32US 4,732,529 AShimadzu Corporation · 1988
- Gas friction vacuum pump having at least three differently configured pump stages releasably connected together32US 5,553,998 ALeybold Aktiengesellschaft · 1996
- Turbo molecular pump28US 5,924,841 AMitsubishi Heavy Industries, Ltd. · 1999