F04C 2250/201
Conical shape
Official title: conical shape
F04C2250/201 (Conical shape) appears on 44 US grants and 42 published applications in this corpus.
Search patents in F04C- Granted patents
- 44
- Published applications
- 42
- Assignees
- 28
- Inventors
- 92
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 1 |
| 2002 | 2 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 2 |
| 2008 | 1 | 1 |
| 2009 | 0 | 1 |
| 2010 | 1 | 4 |
| 2011 | 0 | 1 |
| 2012 | 3 | 1 |
| 2013 | 1 | 0 |
| 2014 | 1 | 1 |
| 2015 | 2 | 2 |
| 2016 | 1 | 2 |
| 2017 | 2 | 4 |
| 2018 | 1 | 4 |
| 2019 | 3 | 2 |
| 2020 | 1 | 2 |
| 2021 | 4 | 2 |
| 2022 | 1 | 4 |
| 2023 | 3 | 4 |
| 2024 | 7 | 2 |
| 2025 | 2 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Complex screw rotors with a central circular cross section connecting right-hand and left-hand sections of the rotors4 Nov 2025US 12,460,640 B2Industrial Technologies and Services, LLC
- Progressing cavity devices and assemblies for coupling multiple stages of progressing cavity devices24 Jun 2025US 12,338,819 B2National Oilwell Varco, L. P.
- Eccentric screw pump with working engagement and idle engagement and method for controlling the eccentric screw pump29 Oct 2024US 12,129,851 B2Vogelsang GmbH & Co. KG
- Complex screw rotors having multiple helical profiles joined by a centeral portion with a pocket8 Oct 2024US 12,110,888 B2Industrial Technologies and Services, LLC
- Complex screw rotors having multiple helical profiles joined by a centeral portion with a pocket3 Sep 2024US 12,078,169 B2Industrial Technologies and Services, LLC
- Complex screw rotors28 May 2026US 2026/0146608 A1
- Progressing cavity devices and assemblies for coupling multiple stages of progressing cavity devices18 Sep 2025US 2025/0290507 A1National Oilwell Varco, L. P.
- Complex screw rotors26 Dec 2024US 2024/0426298 A1Industrial Technologies and Services, LLC
- Rotor for an eccentric screw pump and method for the manufacture thereof8 Feb 2024US 2024/0044330 A1Vogelsang GmbH & Co. KG
- Complex screw rotors31 Aug 2023US 2023/0272797 A1Industrial Technologies and Services, LLC
Most cited
By later US patents
- Self compensating adjustable fit progressing cavity pump for oil-well applications with varying temperatures32US 6,457,958 B1Weatherford/Lamb, Inc. · 2002
- Adjustable fit progressive cavity pump/motor apparatus and method31US 6,358,027 B1Weatherford/Lamb, Inc. · 2002
- Rotary positive displacement machine for a compressible working fluid16US 4,863,357 ASvenska Rotor Maskiner AB · 1989
- Fluid rotary apparatus having tapered rotors14US 5,533,887 AMatsushita Electric Industrial Co., Ltd. · 1996
- Indexed positive displacement rotary motion device9US 8,602,758 B2Exponential Technologies, Inc. · 2013