ALEXANDRIA, Va., March 26 -- United States Patent no. 12,258,890, issued on March 25, was assigned to YAMAHA HATSUDOKI K.K. (Iwata, Japan).
"Catalyst deterioration diagnosis device" was invented by Kenichi Kumagai (Shizuoka, Japan) and Yuta Shimizu (Shizuoka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A catalyst deterioration diagnosis device, including: a processor to execute, when a cycle of reversal between increasing and decreasing of a fuel amount is disturbed such that the increasing/decreasing of the fuel amount is reversed three or more times in a period that is identical in length with a period in which the increasing/decreasing of the fuel amount is reversed twice when the reversal betwee...