F27D 3/08
Screw feeders
Official title: Screw feeders; Screw dischargers
F27D3/08 (Screw feeders) appears on 100 US grants and 84 published applications in this corpus.
Search patents in F27D- Granted patents
- 100
- Published applications
- 84
- Assignees
- 91
- Inventors
- 272
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 7 | 0 |
| 2000 | 8 | 0 |
| 2001 | 5 | 2 |
| 2002 | 4 | 6 |
| 2003 | 5 | 5 |
| 2004 | 7 | 6 |
| 2005 | 3 | 3 |
| 2006 | 1 | 2 |
| 2007 | 1 | 4 |
| 2008 | 0 | 3 |
| 2009 | 3 | 3 |
| 2010 | 4 | 3 |
| 2011 | 4 | 2 |
| 2012 | 1 | 1 |
| 2013 | 2 | 2 |
| 2014 | 1 | 1 |
| 2015 | 2 | 4 |
| 2016 | 3 | 5 |
| 2017 | 2 | 2 |
| 2018 | 2 | 3 |
| 2019 | 3 | 2 |
| 2020 | 1 | 2 |
| 2021 | 1 | 2 |
| 2022 | 1 | 7 |
| 2023 | 3 | 4 |
| 2024 | 5 | 3 |
| 2025 | 4 | 2 |
| 2026 | 2 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method of producing cement clinker and a second calcined material17 Mar 2026US 12,577,156 B2Amrize Technology Switzerland LLC
- Method of producing molten iron using electric furnace including video device3 Mar 2026US 12,566,029 B2Jfe Steel Corporation
- Submerged feedstock charging of melting vessels29 Jul 2025US 12,371,361 B2Owens-Brockway Glass Container Inc.
- Plastic conversion feed system22 Jul 2025US 12,366,412 B2RES Polyflow LLC
- Screw conveyor shaft seal and related methods18 Feb 2025US 12,227,364 B2Bridgestone Corporation
- Electrode Material Sintering System27 Aug 2026US 2026/0249353 A1LG Chem.Ltd.
- Remediation systems and thermal management systems13 Aug 2026US 2026/0233272 A1ASRC Energy Services, LLC
- Supply device for supplying liquid waste to low-temperature melting furnace, and supply method using same23 Jul 2026US 2026/0210635 A1Korea Hydro & Nuclear Power Co., Ltd.
- Waste heat recovery system and method of recovering waste heat from a furnace21 May 2026US 2026/0138906 A1
- Method of calcining a raw material to obtain a cementitious material15 Jan 2026US 2026/0015286 A1
Most cited
By later US patents
- Coal charging car for charging chambers in a coke-oven battery114US 6,152,668 AThyssen Krupp Encoke GmbH · 2000
- Method for operating moving hearth reducing furnace37US 6,251,161 B1Kabushiki Kaisha Kobe Sieko Sho (Kobe Steel, Ltd.) · 2001
- Conveying screw for furnace36US 4,636,127 AThe International Metals Reclamation Company, Inc. · 1987
- Impedance-heated furnace32US 5,869,810 A1999
- Plug seal discharge system for distillation apparatus22US 5,871,619 ATire Recycling Technologies Corp. · 1999