F28F 5/06
Hollow screw conveyors
F28F5/06 (Hollow screw conveyors) appears on 23 US grants and 24 published applications in this corpus.
Search patents in F28F- Granted patents
- 23
- Published applications
- 24
- Assignees
- 20
- Inventors
- 51
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 0 | 0 |
| 2010 | 1 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 3 |
| 2017 | 1 | 3 |
| 2018 | 1 | 1 |
| 2019 | 3 | 3 |
| 2020 | 3 | 2 |
| 2021 | 3 | 0 |
| 2022 | 1 | 1 |
| 2023 | 0 | 2 |
| 2024 | 1 | 1 |
| 2025 | 1 | 2 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Rotary batch preheater14 Apr 2026US 12,600,657 B2
- System and method for hydrothermal carbonization21 Jan 2025US 12,203,042 B2Gregio Energie AG
- Heat exchanger and use of heat exchanger2 Jul 2024US 12,025,380 B2Ireliemar B.V.
- Reaction device with heat exchanger and use thereof15 Feb 2022US 11,247,188 B2Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V.
- Molten-salt-heated indirect screw-type thermal processor7 Dec 2021US 11,193,719 B2
- Rotary Batch Preheater26 Mar 2026US 2026/0084995 A1
- Systems, mixtures and methods of producing paving products using same9 Oct 2025US 2025/0314020 A1
- Phase change cooling system19 Jun 2025US 2025/0203824 A1Digital Porpoise, LLC
- System and method for hydrothermal carbonization20 Jun 2024US 2024/0199967 A1Gregio Energie AG
- Heat exchanger and use of heat exchanger2 Nov 2023US 2023/0349642 A1Ireliemar B.V.
Most cited
By later US patents
- Method for treating waste paint sludge40US 4,980,030 AHaden Schweitzer Corporation · 1990
- Solid flight conveying screw for furnace16US 5,863,197 AThe International Metals Reclamation Company, Inc. · 1999
- Poultry chiller with open auger16US 6,308,529 B1Morris & Associates, Inc. · 2001
- Method and a system for drying sludge12US 5,373,647 AFLS Industries A/S · 1994
- Heat exchanger10US 4,856,580 ABerwind Corporation · 1989