ALEXANDRIA, Va., Sept. 24 -- United States Patent no. 12,744,194, issued on Sept. 22.

"Multimode ion detector with wide dynamic range and automatic mode switching" was invented by Sina Alavi (North York, Canada), Gholamreza Javahery (Thornhill, Canada), Dmitry Valyaev (Richmond Hill, Canada) and Victor Titov (Etobicoke, Canada).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention is ion detection method for mass spectrometer. An electron multiplier is coupled with a conversion dynode for the detection of positive and negative ions. The aperture of the present system is ungrounded. As the ions (positive or negative) approach and go through the aperture, they induce an image current into the ape...