Dual component flap
US5355910A · kind A · utility
35Cited by
12References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1993 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | Oct 13, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7891
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A flap valve apparatus and an improved flap valve element which uses integrally bonded layers comprising a first soft flexible layer of an elastomer and a second layer of a rigid plastics material. The method of forming the flap valve element by a two component extrusion process is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.