Angle of repose valve
US5205998A · kind A · utility
10Cited by
44References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 28, 1992 |
| Grant date | Apr 27, 1993 |
| Priority date | — |
| Expiry date | May 28, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/0091
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and process for maintaining the purity of solid/granular product and dispensing high purity granular product from a vessel. A noncontaminating surface is provided by a cup, cylinder, or other structure having a surface of silicon, silicon carbide, silicon nitride, sialon, or similar materials and preferably operates as an angle of repose valve in a pressurized system to prevent contamination by undue contact of the high purity product with conventional gastight valves such as ball valves, butterfly valves, pinch valves, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.