Injection molding machine
US-12583156-B2 · Mar 24, 2026 · US
Non-return devices
Non-return devices · Cooperative Patent Classification (CPC)
Separating, mixing, shaping, printing, and transporting materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | B29C45/52 |
| Official title | Non-return devices |
| Display label | Non-return devices |
| Total patents | 35 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 3 |
| 2016 | 6 |
| 2017 | 3 |
| 2019 | 1 |
| 2020 | 1 |
| 2021 | 6 |
| 2022 | 2 |
| 2023 | 6 |
| 2024 | 4 |
| 2025 | 2 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Plasticizing unit for a molding machine
US-12397490-B2 · Aug 26, 2025 · US
Backflow-preventing-mechanism-equipped screw, injection molding apparatus including the same, and backflow preventing ring
US-2025205948-A1 · Jun 26, 2025 · US
Control device for injection molding machine
US-12168317-B2 · Dec 17, 2024 · US
Screw of injection molding machine for foam molding, and injection molding machine
US-12138836-B2 · Nov 12, 2024 · US
Injection molding device
US-12076897-B2 · Sep 3, 2024 · US
Plasticizing unit for a molding machine
US-2024083088-A1 · Mar 14, 2024 · US
Nonreturn valve for the screw of a plasticising unit of an injection-moulding machine
US-11826937-B2 · Nov 28, 2023 · US
Injection molding machine
US-2023364841-A1 · Nov 16, 2023 · US
Plasticizing device for a molding machine
US-11806907-B2 · Nov 7, 2023 · US
Injection molding machine for foam molding and method for molding foam molded product
US-2023278270-A1 · Sep 7, 2023 · US
Control device for injection molding machine
US-2023191677-A1 · Jun 22, 2023 · US
Injection molding device
US-2023052889-A1 · Feb 16, 2023 · US
Screw of injection molding machine for foam molding and injection molding machine
US-11504891-B2 · Nov 22, 2022 · US
Method of determining melt flow front travel using injection melt pressure and screw position to generate an output and continuously monitor check ring repeatability
US-11440230-B2 · Sep 13, 2022 · US
Plasticizing device for a molding machine
US-2021354356-A1 · Nov 18, 2021 · US
Plasticizing screw for a molding machine
US-2021331364-A1 · Oct 28, 2021 · US
Injection moulding machine for producing fibre-reinforced plastic mouldings
US-11123906-B2 · Sep 21, 2021 · US
Screw of injection molding machine for foam molding and injection molding machine
US-2021178648-A1 · Jun 17, 2021 · US
Control device and control method for injection molding machine
US-2021094213-A1 · Apr 1, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B29C45/52?
- CPC B29C45/52 is the Cooperative Patent Classification code for “Non-return devices.”
- How many patents are filed under CPC B29C45/52 (Non-return devices)?
- Our database includes 35 publications tagged with this CPC code.
- Is patent activity under CPC B29C45/52 growing?
- Publication counts under this code: 4 in 2024 vs 2 in 2025 (latest complete years).