B29C 45/52
Non-return devices
B29C45/52 (Non-return devices) appears on 121 US grants and 78 published applications in this corpus.
Search patents in B29C- Granted patents
- 121
- Published applications
- 78
- Assignees
- 69
- Inventors
- 206
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 7 | 0 |
| 1993 | 4 | 0 |
| 1994 | 1 | 0 |
| 1995 | 4 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 8 | 2 |
| 2002 | 4 | 2 |
| 2003 | 4 | 6 |
| 2004 | 1 | 7 |
| 2005 | 3 | 4 |
| 2006 | 4 | 4 |
| 2007 | 6 | 5 |
| 2008 | 4 | 9 |
| 2009 | 5 | 5 |
| 2010 | 7 | 2 |
| 2011 | 4 | 1 |
| 2012 | 0 | 3 |
| 2013 | 2 | 2 |
| 2014 | 1 | 1 |
| 2015 | 2 | 3 |
| 2016 | 4 | 3 |
| 2017 | 2 | 3 |
| 2018 | 1 | 0 |
| 2019 | 0 | 4 |
| 2020 | 1 | 0 |
| 2021 | 1 | 5 |
| 2022 | 3 | 0 |
| 2023 | 2 | 3 |
| 2024 | 2 | 2 |
| 2025 | 1 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Injection molding machine24 Mar 2026US 12,583,156 B2Nissei Plastic Industrial Co., Ltd.
- Plasticizing unit for a molding machine26 Aug 2025US 12,397,490 B2Engel Austria GmbH
- Control device for injection molding machine17 Dec 2024US 12,168,317 B2Sumitomo Heavy Industries, Ltd.
- Injection molding device3 Sep 2024US 12,076,897 B2Ls Mtron Ltd.
- Nonreturn valve for the screw of a plasticising unit of an injection-moulding machine28 Nov 2023US 11,826,937 B2KraussMaffei Technologies GmbH
- Vacuum degasser, injection unit provided with same, and method for vacuum degassing27 Aug 2026US 2026/0249531 A1The Japan Steel Works, Ltd.
- Backflow-preventing-mechanism-equipped screw, injection molding apparatus including the same, and backflow preventing ring26 Jun 2025US 2025/0205948 A1The Japan Steel Works, Ltd.
- Injection molding apparatus24 Oct 2024US 2024/0351258 A1
- Plasticizing unit for a molding machine14 Mar 2024US 2024/0083088 A1Engel Austria GmbH
- Injection molding machine16 Nov 2023US 2023/0364841 A1Nissei Plastic Industrial Co., Ltd.
Most cited
By later US patents
- Screw extruder with improved dispersive mixing elements38US 6,136,246 ARauwendaal Extrusion Engineering, Inc. · 2000
- Backflow preventer for an injection molding machine31US 4,477,242 AKrauss-Maffei Aktiengesellschaft · 1984
- Injection molding machine and method30US 4,734,243 AAisin Seiki Kabushiki Kaisha · 1988
- Controlling method of injection through injection molding machine29US 5,002,717 AToyo Machinery & Metal Co., Ltd. · 1991
- Plastic extruder with automatic shut-off valve28US 5,164,207 ASpirex Corporation · 1992