Method and apparatus for particle classification
US4213852A · kind A · utility
Inventor
Key dates
| Filing date | Jan 15, 1979 |
| Grant date | Jul 22, 1980 |
| Priority date | — |
| Expiry date | Jan 15, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB07B4/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Particles are classified according to their terminal velocities, which in turn are determined by their size, shape and composition, by dropping a mass of such particles into an air stream flowing in a direction making a substantial angle with the vertical, and having a high degree of uniformity and low turbulence, so that the particles assume trajectories determined by their terminal velocities. The distance downstream travelled by a particle is inversely proportional to its terminal velocity. Receptacles are provided at different downstream distances from the location of introduction of the material, below the flowing air stream, into which particles of different terminal velocities are collected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.