Poppet check valve for controlled feeding of blowing agent
US4124336A · kind A · utility
25Cited by
2References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 18, 1977 |
| Grant date | Nov 7, 1978 |
| Priority date | — |
| Expiry date | May 18, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7931
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A poppet type check valve for controlled feeding of blowing agent into an assembly for the extrusion of thermoplastic polymeric foam material and, in particular, for controlled feeding of a blowing agent such as pentane into the barrel of an extruder assembly for extrusion of polystyrene foam; and an apparatus assembly comprising such a check valve in combination with the barrel of an extruder for extrusion of such foam materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.