| [4] | Jason Olfert. Particle classifier, Canada Patent Number 2,764,522, 2015. [ bib ] |
| [3] | Jason Olfert. Particle classifier, United States Patent Number 8,966,958, 2015. [ bib ] |
| [2] | Jason Olfert. Particle classifier, Japanese Patent Number 5658244, 2014. [ bib ] |
| [1] | Jason Olfert. Particle classifier, European Patent number: Ep2449359b1. [ bib ] |