ALEXANDRIA, Va., June 12 -- United States Patent no. 12,298,216, issued on May 13, was assigned to CAMBRIDGE ENTERPRISE Ltd. (Cambridge, Great Britain).
"Particle sensor and sensing method" was invented by Robert Nishida (Victoria, Canada), Tyler James Johnson (Edmonton, Canada), Simone Hochgreb (Cambridge, Great Britain) and Adam Meyer Boies (Cambridge, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "A particle sensor for measuring size and concentration properties of particles in a gas includes a bipolar diffusion charger configured to charge particles within a received gas sample by the collision of the received particles with and transfer of charge from both positive and negative ions concur...